When it comes to low-power, high-current, and ultra-high-speed semiconductor devices, many electronics hobbyists or engineers must first think of Schottky diodes (SBD). But do you really know how to use Schottky diodes? Compared with other diodes, what is special about Schottky diodes? This article will answer these questions for you and introduce Schottky diodes in details. This short video gives a brief introduction to Schottky Diode Catalog I. Schottky Diode Brief Introduction II. How does Schottky Diode Work? III. The Structure of Schottky Diode IV. How to Test Schottky Diode? V. Pros and Cons of Schottky Diode VI. Where to Use Schottky Diode? VII. How to Use Schottky Diode Correctly? FAQ I. Brief Introduction to Schottky Diode  Schottky diodes are named after their inventor, Dr. Schottky. The full name is: Schottky RecTIfier Diode (abbreviated as SR), also called: Schottky barrier diode, or SBD.   Schottky diode is a low-power, ultra-high-speed semiconductor device. The most notable feature is its extremely short reverse recovery time (can be as small as a few nanoseconds), and the forward voltage drop is only about 0.4V. It is mostly used as high-frequency, low-voltage, high-current rectifier diodes, freewheeling diodes, protection diodes, and also useful as rectifier diodes and small-signal detector diodes in circuits such as microwave communications. It is more common in communication power supplies, inverters, etc.   A typical application of Schottky diodes is in the switching circuit of a bipolar transistor BJT. By connecting a Shockley diode to the BJT to clamp, the transistor is actually close to the off state when the transistor is on, thereby improving the transistor’s performance. Switching speed. This method is a technique used in the TTL internal circuits of typical digital ICs such as 74LS, 74ALS, and 74AS.   The biggest feature of Schottky diodes is that the forward voltage drop VF is relatively small. In the case of the same current, its forward voltage drop is much smaller. In addition, its recovery time is short. It also has some shortcomings: the withstand voltage is relatively low, and the leakage current is slightly larger. It must be fully considered when selecting. II. How does Schottky Diode Work? Schottky diodes are metal-semiconductor devices made of precious metals (gold, silver, aluminum, platinum, etc.) A as the anode and N-type semiconductor B as the cathode. The barrier formed on the contact surface of the two has rectification characteristics.   Because there are a large number of electrons in N-type semiconductors, and there are only a small amount of free electrons in noble metals, electrons diffuse from the high concentration of B to the low concentration of A. Obviously, there are no holes in metal A, and there is no diffusion movement of holes from A to B.   As electrons continue to diffuse from B to A, the electron concentration on the surface of B gradually decreases, and the electrical neutrality of the surface is destroyed, so a potential barrier is formed, and the direction of the electric field is B→A. But under the action of this electric field, the electrons in A will also produce a drifting movement from A→B, thereby weakening the electric field formed by the diffusion movement.   When a space charge region with a certain width is established, the drifting movement of electrons caused by the electric field and the diffusion movement of electrons caused by different concentrations reach a relative balance, forming a Schottky barrier.   The internal circuit structure of a typical Schottky rectifier is based on an N-type semiconductor, and an N-epitaxial layer with arsenic as a dopant is formed on it. The anode uses materials such as molybdenum or aluminum to make a barrier layer. Use silicon dioxide (SiO2) to eliminate the electric field in the edge area and improve the withstand voltage of the tube.   The N-type substrate has a small on-state resistance, and its doping concentration is 100% higher than that of the H-layer. An N+ cathode layer is formed under the substrate, and its function is to reduce the contact resistance of the cathode. By adjusting the structural parameters, a Schottky barrier is formed between the N-type substrate and the anode metal.   When a forward bias is applied to both ends of the Schottky barrier (the anode metal is connected to the positive pole of the power supply, and the N-type substrate is connected to the negative pole of the power supply), the Schottky barrier layer becomes narrower and its internal resistance becomes smaller; on the contrary, if When reverse bias is applied to both ends of the Schottky barrier, the Schottky barrier layer becomes wider and its internal resistance becomes larger.   In summary, the structure principle of Schottky rectifier is very different from PN junction rectifier. The PN junction rectifier is usually called the junction rectifier, and the metal-semi-conductor rectifier is called the Schottky rectifier.   Aluminum-silicon Schottky diodes manufactured by the silicon plane process have also come out, which not only saves precious metals, but also Significantly reduce costs and improve the consistency of parameters. III. The Structure of Schottky Diode The structure and materials of the new high-voltage SBD are different from the traditional SBD. Traditional SBD is formed by contacting metal and semiconductor. The metal material can be aluminum, gold, molybdenum, nickel, titanium, etc., and the semiconductor is usually silicon (Si) or gallium arsenide (GaAs).   Since electrons have higher mobility than holes, in order to obtain good frequency characteristics, N-type semiconductor materials are selected as the substrate. In order to reduce the junction capacitance of the SBD and increase the reverse breakdown voltage without making the series resistance too large, a high-resistance N-thin layer is usually epitaxially on the N+ substrate.   CP is the parallel capacitance of the shell and tube, LS is the lead inductance, RS is the series resistance including the semiconductor body resistance and lead resistance, and Cj and Rj are the junction capacitance and junction resistance (both are functions of bias current and bias voltage), respectively.   As we all know, there are a large number of conductive electrons inside a metal conductor. When the metal is in contact with the semiconductor (the distance between the two is only an order of magnitude of the atom), the Fermi level of the metal is lower than the Fermi level of the semiconductor. At the sub-energy level corresponding to the conduction band of the semiconductor inside the metal, the electron density is less than that of the conduction band of the semiconductor.   Therefore, after the two contact, electrons will diffuse from the semiconductor to the metal, so that the metal is negatively charged and the semiconductor is positively charged. Since metal is an ideal conductor, negative charges are only distributed in a thin layer with the size of an atom on the surface.   For N-type semiconductors, the donor impurity atoms that have lost electrons become positive ions, which are distributed in a larger thickness. As a result of the diffusion and movement of electrons from the semiconductor to the metal, a space charge zone, self-built electric field and potential barrier are formed, and the depletion layer is only on the side of the N-type semiconductor (all the barrier zone falls on the semiconductor side).   The direction of the self-built electric field in the barrier zone points from the N-type region to the metal. With the increase of the thermionic self-built field, the drift current opposite to the diffusion current direction increases, and finally a dynamic equilibrium is reached, forming a contact potential between the metal and the semiconductor Barrier, this is the Schottky barrier.   When the applied voltage is zero, the diffusion current of electrons is equal to the reverse drift current, achieving dynamic equilibrium. When a forward bias is applied (that is, a positive voltage is applied to a metal and a negative voltage is applied to a semiconductor), the self-built field is weakened and the barrier on the semiconductor side is lowered, thus forming a positive current from the metal to the semiconductor.   When a reverse bias is applied, the self-built field increases, and the barrier height increases, forming a smaller reverse current from the semiconductor to the metal. Therefore, the SBD, like the PN junction diode, is a non-linear device with unidirectional conductivity. IV. How to Test Schottky Diode? Here we show you three testing method for three different diodes. 1. Detect low-power crystal diodes   A. Discrimination of positive and negative electrodes   (1) Observe the symbol mark on the housing. Usually the diode is marked with the symbol of the diode on the housing of the diode, one end with a triangular arrow is the positive electrode, and the other end is the negative electrode.   (2) Observe the color dots on the shell. The case of point contact diodes is usually marked with polar color points (white or red). Generally, the end marked with a colored dot is the positive electrode. Other diodes are marked with a color ring, and the end with the color ring is the negative electrode.   (3) Based on a measurement with a smaller resistance value, the end connected to the black test lead is the positive electrode, and the end connected to the red test lead is the negative electrode.   B. Detect the highest working frequency fM. The operating frequency of crystal diodes can be found in the relevant characteristic table. In practice, they are often distinguished by observing the contact wires inside the diode.    For example, point contact diodes are high-frequency tubes, and surface contact diodes are mostly low-frequency tubes. In addition, you can also use the multimeter R×1k block to test, generally the forward resistance is less than 1k high frequency tube.   C. Detect the highest reverse breakdown voltage VRM. For alternating current, because of constant changes, the highest reverse working voltage is also the peak alternating current voltage that the diode bears.   It should be pointed out that the highest reverse working voltage is not the breakdown voltage of the diode. Under normal circumstances, the breakdown voltage of the diode is much higher than the maximum reverse working voltage (about twice as high).   2. Detection of high frequency varistor diodes   A. identification diode positive and negative   The difference in appearance between high-frequency varistor diodes and ordinary diodes is that their color code is different. The color code of ordinary diodes is generally black, while the color code of high-frequency varistor diodes is light. Its polarity law is similar to that of ordinary diodes, that is, the end with the green ring is the cathode, and the end with the green ring is the anode.   B. Measure the forward and reverse resistance to judge whether it is good or bad   The specific method is the same as the method of measuring the forward and reverse resistance of ordinary diodes. When using a 500-type multimeter to measure the R×1k gear, the forward resistance of a normal high-frequency varistor diode is 5k～55k, and the reverse resistance is infinity.   3. Transient voltage suppression diode (TVS) detection   Use a multimeter to measure the quality of the tube. For a unipolar TVS, according to the method of measuring ordinary diodes, the forward and reverse resistance can be measured. Generally, the forward resistance is about 4kΩ, and the reverse resistance is infinite.   For the two-way polar TVS, the resistance between the two pins should be infinite when the red and black test leads are arbitrarily exchanged. Otherwise, the tube has poor performance or has been damaged. V. Pros and Cons of Schottky Diode Pros:  Schottky diodes have the advantages of high switching frequency and reduced forward voltage, but their reverse breakdown voltage is relatively low, mostly not higher than 60V, and the highest is only about 100V, which limits its application range.   Like in the switching power supply (SMPS) and power factor correction (PFC) circuit, the freewheeling diode of the power switch device, the high frequency rectifier diode of 100V or more used in the transformer secondary, the 600V～1.2kV high speed diode in the RCD snubber circuit, and For PFC boosting 600V diodes, only fast recovery epitaxial diodes (FRED) and ultra-fast recovery diodes (UFRD) are used.   The reverse recovery time Trr of UFRD is also above 20ns, which cannot meet the needs of 1MHz～3MHz SMPS in fields such as space stations. Even for SMPS with hard switching of 100kHz, due to the large conduction loss and switching loss of UFRD, the case temperature is very high, and a larger heat sink is required, which increases the size and weight of SMPS, which does not meet the requirements of miniaturization and lightness. Development trend.   Therefore, the development of high-voltage SBDs above 100V has always been a research topic and a hot spot of concern. In recent years, SBD has made breakthrough progress. High-voltage SBDs of 150V and 200V have been put on the market, and SBDs with more than 1kV made of new materials have also been successfully developed, thus injecting new vitality and vitality into their applications.   Cons:  The biggest disadvantage of Schottky diodes is their low reverse bias voltage and large reverse leakage current. For example, Schottky diodes using silicon and metal as materials have the highest reverse bias voltage rating. To 50V, and the reverse leakage current value is a positive temperature characteristic, it is easy to increase rapidly as the temperature rises, and it is necessary to pay attention to the hidden concern of thermal runaway in practical design.   In order to avoid the above-mentioned problems, the reverse bias voltage of the Schottky diode in actual use will be much smaller than its rated value. However, the technology of Schottky diodes has also progressed, and its reverse bias voltage rating can reach up to 200V. VI. Where to Use Schottky Diode? The structure and characteristics of SBD make it suitable for high-frequency rectification in low-voltage and high-current output occasions. It is used for detection and mixing at very high frequencies (such as X-band, C-band, S-band and Ku-band). Used as a clamp in high-speed logic circuits. SBD is often used in ICs. SBD*TTL integrated circuits have long become the mainstream of TTL circuits and are widely used in high-speed computers.   In addition to the characteristic parameters of ordinary PN junction diodes, SBD electrical parameters used for detection and mixing also include intermediate frequency impedance (referring to the impedance presented by the SBD to the specified intermediate frequency when the rated local oscillator power is applied, generally between 200Ω and 600Ω) , Voltage standing wave ratio (generally ≤ 2) and noise figure, etc. VII. How to Use Schottky Diode Correctly? Schottky diodes are widely used in circuits such as switching power supplies, frequency converters, and drivers. In different applications, different factors need to be considered, and different devices have different performances. Therefore, when selecting Schottky diodes, the following key parameters need to be considered comprehensively.   1. The conduction voltage drop VFVF is the voltage drop across the diode when the diode is forward-conducting. When the current through the diode is larger, the VF is larger; when the diode temperature is higher, the VF is smaller.   2. The reverse saturation leakage current IRIR refers to the current that flows through the diode when the reverse voltage is added to the two ends of the diode. The reverse leakage current of the Schottky diode is relatively large. The choice of Schottky diode is to choose a diode with a smaller IR as much as possible.   3. The rated current IF refers to the average current value calculated according to the allowable temperature rise during long-term operation of the diode.   4. The maximum surge current IFSM allows excessive forward current to flow. It is not a normal current, but an instantaneous current, which is quite large.   5. Even if the maximum reverse peak voltage VRM does not have reverse current, as long as the reverse voltage is continuously increased, the diode will be damaged sooner or later.   This reverse voltage that can be applied is not an instantaneous voltage, but a forward and reverse voltage repeatedly applied. Because the AC voltage is added to the rectifier, its maximum value is a specified important factor.   The maximum reverse peak voltage VRM refers to the maximum reverse voltage that can be applied to avoid breakdown. Currently Schottky's highest VRM value is 150V. FAQ 1. What is Schottky diode used for? Schottky diodes are used for their low turn-on voltage, fast recovery time and low-loss energy at higher frequencies. These characteristics make Schottky diodes capable of rectifying a current by facilitating a quick transition from conducting to blocking state. 2. What is the difference between Schottky diode and normal diode? In the normal rectifier grade PN junction diode, the junction is formed between P type semiconductor to N type semiconductor. Whereas in Schottky diode the junction is in between N type semiconductor to Metal plate. The schottky barrier diode has electrons as majority carriers on both sides of the junction. 3. How does Schottky diode work? In a Schottky diode, a semiconductor–metal junction is formed between a semiconductor and a metal, thus creating a Schottky barrier. The N-type semiconductor acts as the cathode and the metal side acts as the anode of the diode. This Schottky barrier results in both a low forward voltage drop and very fast switching. 4. What are the two important features of a Schottky diode? We have seen here that the Schottky Diode also known as a Schottky Barrier Diode is a solid-state semiconductor diode in which a metal electrode and an n-type semiconductor form the diodes ms-junction giving it two major advantages over traditional pn-junction diodes, a faster switching speed, and a low forward bias. 5. What is Schottky diode made of? Schottky diodes made from palladium silicide (PdSi)[clarification needed] are excellent due to their lower forward voltage (which has to be lower than the forward voltage of the base-collector junction). 6. Why Schottky is called hot carrier diode? When a Schottky diode is in unbiased condition, the electrons lying on the semiconductor side have a very low energy level when compared to the electrons present in the metal.Thus, the electrons cannot flow through the junction barrier which is called the Schottky barrier. If the diode is forward biased, electrons present in the N-side get sufficient energy to cross the junction barrier and enters the metal.These electrons enter into the metal with tremendous energy. Consequently, these electrons are known as hot carriers. Thus the diode is called a hot-carrier diode. 7. What is Schottky barrier rectifier? The Schottky diode or Schottky Barrier Rectifier is named after the German physicist “Walter H. Schottky”, is a semiconductor diode designed with a metal by the semiconductor junction. It has a low-forward voltage drop and a very rapid switching act. ... Actually, it is one of the oldest semiconductor devices in reality. 8. What is meant by Schottky effect? Schottky effect, increase in the discharge of electrons from the surface of a heated material by application of an electric field that reduces the value of the energy required for electron emission. ... The effect is named after its discoverer, the German physicist Walter Schottky. 9. Why Schottky barrier is formed? When a metal is put in direct contact with a semiconductor, a so called Schottky barrier can be formed, leading to a rectifying behavior of the electrical contact. 10. What is the barrier potential of Schottky diode? The forward voltage drop ranges from 0.3 volts to 0.5 volts. The barrier of forward voltage drop is made of silicon. The forward voltage drop is proportional to the doping concentration of N type semiconductor. Due to high concentration of current carriers, the V-I characteristic of Schottky diode is steeper.

This article is an introduction article on the resonator, information like its working principle, types, and some main parameters will be introduced in detail, also including the analysis of the difference between resonator and oscillator.     Catalog I. What is A Resonator? II. The Working Principle of Resonator      2.1 The Structure of Resonator      2.2 Piezoelectric Effect III. Resonator Types IV. Main Parameters of Resonator V. What’s the Difference Between Resonator and Oscillator? 5.1 General Difference Between Resonator &   Oscillator 5.2 Pros and Cons Analysis of Resonator &   Oscillator FAQ   I. What is A Resonator? This video introduce resonator in details.   A resonator refers to an electronic component that generates a resonant frequency.   A resonator refers to an electronic component that generates a resonant frequency. It is a typical passive device and requires a peripheral circuit to drive its work to generate a clock output.   Crystal resonators are commonly divided into quartz crystal resonators and ceramic resonators. The function of generating frequency has the characteristics of stability and good anti-interference performance and is widely used in various electronic products.   The frequency accuracy of quartz crystal resonators is higher than that of ceramic resonators, but the cost is also higher than that of ceramic resonators. The resonator mainly plays the role of frequency control, and all electronic products involve frequency transmission and reception require a resonator. The types of resonators can be divided into the in-line type and patch type according to their appearance. II. The Working Principle of Resonator   2.1 The Structure of Resonator   Quartz crystal resonator is a kind of resonant device made by using the piezoelectric effect of quartz crystal (a crystal of silicon dioxide).   Its basic composition can be roughly described as follows: cut a thin slice (referred to as a wafer, which can be square, rectangular or circular, etc.) from a piece of quartz crystal at a certain azimuth angle, and coat silver layers as electrodes on its two corresponding surfaces. Weld a lead wire on each electrode to the pin, and add a package shell to form a quartz crystal resonator. Its products are generally packaged in metal shells, but also in glass, ceramic or plastic packages.   2.2 Piezoelectric Effect   If an electric field is applied to the two electrodes of the quartz crystal, the wafer will be mechanically deformed. Conversely, if mechanical pressure is applied to both sides of the wafer, an electric field will be generated in the corresponding direction of the wafer. This physical phenomenon is called the piezoelectric effect.   If an alternating voltage is applied to the two poles of the wafer, the wafer will produce mechanical vibration, and at the same time, the mechanical vibration of the wafer will produce an alternating electric field. In general, the amplitude of the mechanical vibration of the wafer and the amplitude of the alternating electric field is very small, but when the frequency of the applied alternating voltage is a certain value, the amplitude is obviously increased, which is much larger than the amplitude at other frequencies. This phenomenon is called piezoelectric resonance, which is very similar to the resonance phenomenon of the LC circuit. Its resonant frequency is related to the cutting method, geometry, and size of the wafer. III. Resonator Types   Quartz crystal resonators are composed of quartz crystal resonators (ie resonators and oscillation circuits) with extremely high-quality factors. The quality of the crystal, the cutting orientation, the structure of the crystal oscillator and the circuit form, etc., jointly determine the performance of the resonator.   The International Electrotechnical Commission (IEC) divides quartz crystal resonators into 4 categories: ordinary crystal oscillator (SPXO), voltage-controlled crystal resonator (VCXO), temperature compensated crystal oscillator (TCXO), and thermostatically controlled crystal oscillator (OCXO). Digitally compensated crystal loss oscillation (DCXO) is currently under development.   (1) Ordinary crystal resonator (SPXO) can produce frequency accuracy of the order of 10-5～10-4, the standard frequency is 100MHZ, and the frequency stability is ±100ppm. SPXO does not use any temperature and frequency compensation measures are low in price and are usually used as a clock device for microprocessors. The package size ranges from 21×14×6mm and 5×3.2×1.5mm.   (2) The accuracy of the voltage-controlled crystal resonator (VCXO) is in the order of 10-6 to 10-5, and the frequency range is 1 to 30 MHz. The frequency stability of the low-tolerance resonator is ±50ppm. Usually used in phase-locked loops. The package size is 14×10×3mm.   (3) The temperature-compensated crystal resonator (TCXO) uses temperature-sensitive devices for temperature and frequency compensation, with a frequency accuracy of 10-7～10-6, a frequency range of 1-60MHz, and frequency stability of ±1～±2.5ppm, The package size ranges from 30×30×15mm to 11.4×9.6×3.9mm. Usually used in handheld phones, cellular phones, two-way wireless communication devices, etc.   (4) The thermostatically controlled crystal resonator (OCXO) places the crystal and oscillation circuit in a thermostat to eliminate the influence of environmental temperature changes on the frequency. The frequency accuracy of OCXO is in the order of 10-7～10-8, even higher for some special applications. The frequency stability is the highest among the four types of resonators. IV. Main Parameters of Resonator   The main parameters of the crystal oscillator are nominal frequency, load capacitance, frequency accuracy, frequency stability, etc. Different crystal oscillators have different nominal frequencies, and most of the nominal frequencies are marked on the crystal housing.   For example, the nominal frequencies of common ordinary crystal oscillators are 48kHz, 500 kHz, 503.5 kHz, 1MHz～40.50 MHz, etc. The frequency of crystal oscillators with special requirements can reach 1000 MHz or more, and there are also non-nominal frequencies, such as CRB, ZTB, Ja, etc.   The load capacitance refers to the sum of all the effective capacitances inside and outside the IC block connected by the two leads of the crystal oscillator, which can be regarded as the series connection capacitance of the crystal oscillator in the circuit. The different load frequency determines the different oscillation frequency of the resonator. For crystal oscillators with the same nominal frequency, the load capacitance may not be the same.   Because the quartz crystal resonator has two resonant frequencies, one is a low-load capacitance crystal of a series resonant crystal oscillator, and the other is a high-load capacitance crystal of a parallel resonant crystal. Therefore, when the crystal oscillators with the same nominal frequency are exchanged, the load capacitance must be the same, and they cannot be exchanged rashly, otherwise, it will cause the electrical appliances to work abnormally.   Frequency accuracy and frequency stability: Because the basic performance of ordinary crystal oscillators meets the requirements of general electrical appliances, certain frequency accuracy, and frequency stability are required for high-end equipment. Frequency accuracy varies from magnitude to magnitude. The stability varies from ±1 to ±100ppm. Choosing the appropriate crystal oscillator according to the specific equipment needs, such as communication network, wireless data transmission and other systems require a more demanding quartz crystal resonator.   Therefore, the parameters of the crystal oscillator determine the quality and performance of the crystal oscillator. In practical applications, the appropriate crystal oscillator should be selected according to specific requirements. Because of the different prices of crystal oscillators with different performances, the higher the requirements, the more expensive the price. Generally, the choice only needs to meet the requirements. V. What’s the Difference Between Resonator and Oscillator?     5.1 General Difference Between Resonator & Oscillator   The so-called resonator includes not only quartz crystal resonators but also ceramic resonators, LC resonators, and so on. A crystal oscillator is the abbreviation of the crystal oscillator. It is an oscillator component composed of a combination of a crystal resonator and a circuit, especially an oscillator component made of a quartz crystal.   So the complete naming should be "Quartz Crystal Resonator" and "Quartz Crystal Oscillator". In addition, the resonator is a passive device, which requires a peripheral circuit to drive its work and generate a clock output. The oscillator is an active device with its own built-in circuit to provide a more stable clock output.   A crystal oscillator is an oscillating circuit that uses a crystal as a frequency-selecting component. Compared with other oscillating circuits, it has the advantages of good frequency selection characteristics (high Q value) and high-frequency stability.   The fundamental difference between a resonator and an oscillator is active and passive, which can also be said to be active and passive. The oscillator has one more control circuit than the resonator.   Crystal resonators have some equivalent parameters, and different use environments may have different requirements. For example, some users require load capacitance C0 / C1. When selecting, consider the environmental temperature, load capacitance, frequency accuracy, and even DLD requirements. This requires some control of the parameters of the peripheral oscillator circuit to output a stable frequency.   The crystal oscillator avoids these troubles. The oscillating circuit has been completed by the manufacturer, and only a stable power supply is needed to have a stable output. In addition, the oscillator has some auxiliary functions, such as voltage-controlled crystal oscillator (VCXO), temperature-compensated crystal oscillator (TCXO), constant temperature crystal oscillator (OCXO), etc. These oscillators can meet some precision controls that are difficult to achieve when directly using resonators. . The frequency accuracy of OCXO can reach the order of E-9.   Secondly, the crystal oscillator is made of a crystal resonator, in order to be used as a signal carrier or timing on other components. To meet the requirements of the products produced.   An oscillator is simply a frequency source and is generally used in a phase-locked loop. In detail, it is a device that can convert DC power into AC power without external signal excitation. Generally divided into two types: positive feedback and negative resistance.   The so-called "oscillation", its meaning implies exchange, the oscillator includes a process and function from no oscillation to oscillation. It can complete the conversion from DC power to AC power. Such a device can be called an "oscillator."   Any communication or electronic system should have a level value within a normal range at some given point. The components that are adjusted to the normal level value are amplifiers and attenuators. The point of excessively low level is the point where noise is introduced, and the point of excessively high level will cause overload and make the amplifying component appear intolerable nonlinear distortion. It is not difficult to understand the role of the attenuator. There are two types of attenuators: fixed and variable.     5.2 Pros and Cons Analysis of Resonator & Oscillator   In this sector, we are going to analyze the pros and cons of crystal resonator and ceramic resonator, resonator, and oscillator.   (1) pros and cons of crystal resonator and ceramic resonator   The introduction of the crystal resonator has been mentioned above, so I won't repeat it here. Let's take a look at ceramic resonators.   A ceramic resonator is a piezoelectric ceramic device used to oscillate at a specific frequency. The materials used to make such devices excite resonance characteristics during the production process.   Because this resonance characteristic is within the production error range, and its quality factor is much lower than that of quartz, the frequency stability that ceramic resonators can provide is not as good as crystal resonators. Generally, ceramic resonators are used in occasions where the cost is low and the performance requirements are not high.   Pros: Compared with crystals, the cost of ceramic resonators is only half that of crystals and the size is smaller.   Cons: Compared with crystals, it lacks frequency and temperature stability. Its accuracy is poor, probably between 1% and 0.1%.     (2) pros and cons of resonator and oscillator   The oscillator is an energy conversion device that converts DC power into AC power with a certain frequency. The circuit formed by it is called an oscillator circuit. The oscillator is an active device. The oscillator has one more control circuit than the resonator.   Oscillators are electronic components used to generate repetitive electronic signals (usually sine waves or square waves). The circuit formed by it is called an oscillating circuit. An electronic circuit or device that can convert direct current into an alternating current signal with a certain frequency.   There are many types. According to the oscillation excitation mode, it can be divided into the self-excited oscillator and separately excited oscillator; according to the circuit structure, it can be divided into the resistance-capacitance oscillator, inductance-capacitance oscillator, crystal oscillator, tuning fork oscillator, etc.; according to the output waveform can be divided into It is a sine wave, square wave, sawtooth wave, and other oscillators. It is widely used in the electronics industry, medical treatment, scientific research, etc.   Pros: The crystal oscillator signal quality is good, relatively stable, and the connection method is relatively simple (mainly to do a good job of power filtering, usually a PI filter network composed of a capacitor and an inductance is used, and the output terminal uses a small resistance resistor to filter the signal. Yes), no complicated configuration circuit is required. For applications with sensitive timing requirements, the performance of crystal oscillators is relatively good.   Cons: Compared with the crystal resonator, the defect of the crystal oscillator is that its signal level is fixed, and the appropriate output level needs to be selected. It is less flexible and expensive. In addition, the quartz oscillator takes a long time to start.   Volume: Compared with passive crystals, crystal oscillators are usually larger in volume. With the improvement of technology, some crystal oscillators are now surface-mounted, and the volume is comparable to crystal resonators.   Summary: The typical initial accuracy of ceramic resonators is in the range of 0.5% to 0.1%, and drift caused by aging or temperature changes may change this accuracy range.   The tolerances of cheap ceramic resonators are only ±1.1%, and the accuracy of higher-end automobiles is ±0.25% and ±0.3%, respectively. The future application lies in the automotive CAN (controller area network) bus application with an operating temperature of -40°C to +125°C. Low-cost ceramic resonators with frequencies ranging from 200 kHz to about 1 GHz are suitable for embedded systems that do not have strict timing requirements.   Ceramic devices start faster and are generally smaller than quartz devices. They are also more able to withstand shock and vibration.     FAQ   1. What does a resonator do? A resonators' sole purpose in life is to change a vehicle's engine noise before it reaches the muffler for a final decibel reduction.   2. What is a resonator in electronics? A resonator is a device or system that exhibits resonance or resonant behavior. ... Resonators are used to either generate waves of specific frequencies or to select specific frequencies from a signal. Musical instruments use acoustic resonators that produce sound waves of specific tones.   3. What does removing the resonator do? A resonator delete changes the way that the pulses generated by your vehicle move through the exhaust system. Think of this device as if it were a large echo chamber. It takes those pulses, optimizes their frequencies, and this makes it possible to achieve better power production.   4. Which is better muffler delete or resonator delete? If you want a louder and lighter vehicle, you'll be better off with the muffler delete. If you're after a good sound and a little more power, the resonator delete is the way to go. ... After all, the difference between a resonator delete and muffler delete isn't that significant.   5. What is difference between crystal and resonator? The ceramic resonator utilizes a frequency within the electrical component but unlike the crystal which has a frequency tolerance of 10~30 PPM , a ceramic resonator carries a 0.5% or 5,000 PPM frequency tolerance which is generally used in microprocessor applications where absolute stability is not important.   6. Is intake resonator necessary? An air intake resonator is a crucial component to an automobile engine's intake system. It allows the engine to run more quietly as well as more efficiently. ... An air intake resonator is a crucial component to an automobile engine's intake system. It allows the engine to run more quietly as well as more efficiently.   7. Do resonators restrict airflow? Magnaflow resonators dont restrict flow at all, its just like adding a section of straight pipe as they are straight through. magnaflow's design uses no chambers, but rather a perforated straight pipe surrounded by a sound-absorbing material.   8. Which is the best frequency for a noise resonator? The resonator is designed to work best in the frequency range where the engine makes the most noise; but even if the frequency is not exactly what the resonator was tuned for, it will still produce some destructive interference.   9. Will a resonator quiet my exhaust? Mufflers and resonators work together to quiet your car's exhaust and reduce annoying sounds. While they function differently, they both help improve your exhaust note. Mufflers and resonators can also be deleted for a louder, more aggressive exhaust sound.   10. Does removing the resonator increase horsepower? As a rule; the quieter an exhaust system is, the more horsepower it is stealing from your engine. ... Removal of all mufflers and resonators will provide slightly greater increases but remember as the restrictions are removed the exhaust grows louder.  

DB9 connectors are commonly used in serial communication. This article will focus on the definition and test method of DB9 connector port and introduce DB9 port in detail. Soldering DB9 Connectors Catalog I What is a DB9 connector? II Where are DB9 Connectors used? 2.1 Communication ports 2.2 Network port 2.3 Computer video output, game controller port III How to test the quality of the serial port cable? IV Is serial cable directly connected or crossed? FAQ I What is a DB9 connector? What is DB9 connector and what are the applications of DB9 female and male connectors? Many people do not understand what is DB9 connector. In fact, DB9 connector is a common electrical connector, is one of the common D-Sub type of connectors. DB9 is the smallest model of D-Subminiature connector, DB9 female connector has 9 pin holes, while DB9 male connector is 9 pins. In addition, DB9 connector is DE9 D-sub 9-pin connector, just incorrectly called "DB9" connector, where E is the size of the shell. For example, computer first used DB25 connector as its serial and parallel port when PC serial port started to use DE9 D-sub 9-pin connector. However, due to ignorance, it was usually labeled as DB9 instead of DE9 connector, incorrectly using B to indicate the fact of shell size. So now it is common to sell DE9 connectors as DB9 connectors, and DB9 means 9-pin connector with E size shell. II Where are DB9 Connectors used? 2.1 Communication ports The most widespread use of D-subs connectors is for RS-232 serial communications, although the standard does not mandate such connectors. RS-232 devices originally used DB25, but for many applications, the less common signals were omitted, allowing the use of DB9 female and male connectors. Many uninterruptible power supply units are equipped with DB9 connectors to send signals to a connected computer through the RS-232 interface. These typically do not send data serially to the computer, but instead use a handshake control line to indicate low battery, power failure, or other conditions. However, this use is not standardized between DB connector manufacturers and may require special cables. 2.2 Network port DE9 connectors are used for some token ring networks as well as other computer networks. DB9 connectors are usually used for CAN: DB9 female connectors are located on the bus, while DB9 male connectors are located on the device. 2.3 Computer video output, game controller port III How to test the quality of the serial port cable? 1. Use a multimeter to test whether the two ends are connected directly with a multimeter to determine whether the two ends are connected, just test 2/3/5 pins. To measure the female head, you need to put the multimeter into the pin air. Because the measuring end of the multimeter is relatively thick, it is necessary to weld two relatively thin metal pins or pins with resistance to the pins of the multimeter to facilitate the measurement of the female head. Use the multimeter to measure 2/3/5 of the serial cable. When measuring, use a straight connection, 2/3/5 corresponds to 2/3/5, and cross-wire 2 to 3, 3 to 2, 5 to 5 for measurement (that is, the 2 on one end of the cross serial port is measured at the other end of 3). 2. The situation of using the serial port assistant to send and receive is to connect RXD to TXD and TXD to RXD, use the serial port assistant to short-circuit the 2/3 pin of DB9, and use the serial port assistant to send data. If there is no problem with the serial port, self-transmit and self-receive can be realized. IV Is serial cable directly connected or crossed? 1. Serial port interface and connection method Male and female headers are divided into three types: male-to-female, male-to-male, and female-to-female. The above three types of connection lines have crossover lines and straight lines, so there are a total of 6 connection modes. 2. What is the direct connection and the crossover connection serial cable: 2 pairs 2, 3 pairs 3, 5 pairs 5. Crossover serial cable: 2 to 3, 3 to 2, 5 to 5. 3. Why are there crossover and direct serial lines? The standard DB9 definition is that pin 2 is RXD and pin 3 is TXD. When designing the circuit, some people connect pin 2 to TXD and pin 3 to RXD in order to use a direct connection. If you don’t reversely connect the transceiver and the standard pin definitions when designing the circuit, you have to use a crossover cable. Under normal circumstances: the two female ends are cross wires, and one male and one female are straight lines. Communication conditions: RXD is connected to TXD, TXD is connected to RXD, and the choice is crossover or direct connection according to the circuit design. Make a serial cable: when there is only a straight cable at hand, you can cut it off. Welding 2 to 3, 3 to 2, and 5 to 5 is a crossover cable. FAQ 1. Is DB9 and VGA the same? The VGA connector can use a classic DB9 connector or (more commonly today) a DB15 style connector. ... The VGA connector (15 pin) is still widely used and while it was originally used to carry a 640 x 480 pixel format it is used to carry a variety of geometries including HDTV formats. VGA is an analog standard. 2. What does DB in DB9 stand for? The DB moniker used on multiple Aston Martin models actually stands for David Brown, who purchased Aston Martin in 1947. 3.What is a D-sub connector used for? D-Sub ports are used for connecting external devices to a computer. They are an older method of connection, but some modern computers still contain them. These ports are gradually being replaced by more efficient connection technology, such as USB and Thunderbolt. 4. Is DB9 the same as RS232? RS-232 is a signalling standard, and DB9 is a connector standard. Most cables that are intended to carry RS-232 signals, have DB9 connectors -- but some RS-232 cables have different connectors, and some cables for other signals have DB9 connectors. 5. What devices use DB9? DB9 connectors were commonly used for serial peripheral devices like keyboards, mice, joysticks, etc. Also they are used on DB9 cable assemblies for data connectivity. Today, the DB9 has mostly been replaced by more modern interfaces such as USB, PS/2, Firewire, and others. 6. What is DB 9 connector used for? The DB9 connector is mainly used in serial ports, allowing asynchronous data transmission according to the RS-232 standard (RS-232C). Note that there are DB9-DB25 adapters that easily convert a DB9 socket to DB25 and vice versa. 7. Can you connect DB9 to VGA? Quickly and easily connect your hard-wired MultiSync® monitor from the VGA video card to a 9-pin cable input. Make the right connection! This adapter allows the MultiSync® DB9 style video output port on a desktop or laptop computer to connect to a VGA (HD15) style video input port on a monitor. 8. On what type of cable would you find a DB9 connector? Serial Cable. 6ft DB9 Female to 3.5mm Serial Cable. This is a generic serial cable for devices. It has a stereo 3.5 mm Jack to DB9-F serial port. You can use this cable when you want transfer serial data back and forth from small devices like mobile phones. 9. Which pins on the db9 connector are for communication? Serial communication devices make use of 9 or 25 pin D-type connectors for their cabled connections. They are commonly designated as DB-9 or DB-25 with the number used to differentiate between the pin counts. 10. What is the difference between DB25 and db9 serial ports?

PCB printers are able to make PCBs without engraving. they do this by spraying a special type of ink called conductive ink on a flat, hard surface. Printers that can easily print electronic circuits rather than circuit boards are also under development. Top 5 PCB Printing and Prototyping machines for your desktop In this blog, you will see top 5 best PCB printers on your desk, each with their own advantages of use, for users with different printing needs. You can take a quick look at the features of 5  PCB printers below:  - Nano Dimension DragonFly 2020: World’s first 3-D PCB printer  - Voltera V-One: Circuit board prototyping machine  - The Othermill: A desktop CNC mill for electronics  - Voxel8: 3D electronics printing  - Prometheus PCB milling machine Nano Dimension DragonFly 2020 PCB Printer The Nano Dimension DragonFly 2020 PCB printer is touted as the world's first 3-D PCB printer and the first desktop printer to meet IPC guidelines. It can produce PCBs from scratch with a minimum feature size of 80 μm and a maximum of 1.5 mm. the minimum layer thickness is 30 μm or 0.03 mm. the positioning accuracy is 25 μm along any axis. the maximum build size is 200 x 200 x 3 mm. it can produce multilayer PCBs with a total thickness of up to 3 mm. the printer supports many different conductive and dielectric inks. Voltera V-One PCB Printer The Voltera V-One is a printed circuit board printer that is very easy to use and perfect for electronics R&D departments, schools, or researchers. This tool makes it as easy to print circuit boards as it is to print parts. Users build boards faster, using the Voltera V-One printer to prototype project boards on the desktop. The process is as simple as inputting a gerber file into the Voltera software, pressing print, and the V-One will print out a lifelike circuit, then use the spray paste (solder) and reflow features to solder the electronics to the board. The Voltera V-One can be used to -Print circuits: Design, fabricate, test, and recreate circuit cloth -Assemble electronic components: Solder electronic components as small as 0402 to a circuit board with solder paste -Research: Spray and cure your own materials Othermill Pro PCB Printer Othermill Pro is a portable, precise milling machine that allows you to use digital designs to create 2D and 3D objects from durable materials such as wood, metal and plastic. Othermill Pro is essentially for the production of fast double-sided printed circuit boards with trace widths down to 150 μm. positioning accuracy is approximately 75 μm. workpiece sizes up to 140 x 114 mm are possible. One limitation is that harder materials such as glass and FR-4 cannot be used. the Othermill Pro can be used with a wide range of operating systems and PCB software. It is currently only available in the US. Voxel8 PCB Printer The Voxel8 desktop 3D printer was developed based on basic patents related to the University of Illinois and Harvard University and features two different print heads, one based on common FFF/FDM technology using fused wire and the other using conductive silver ink. Functional materials are at the heart of the Voxel8 technology, and according to the company, their silver ink is 20,000 times more conductive than the most conductive thermoplastic wire currently available, and 5,000 times more conductive than carbon-based inks such as Bare Conductive material! Voxel8's specially formulated inks are deposited through a dedicated 250 micron diameter nozzle. Once printed, it dries quickly at room temperature and requires no post-processing. These properties make it possible to print on traditional thermoplastic materials. 3D electronics printing requires the ability to insert multiple components into the printing process. The Voxel8 desktop 3D printer is equipped with a highly repeatable magnetic print bed that enables you to temporarily remove the printed object during the printing process, insert components, such as LEDs or sensors, and then put them back in to continue the printing process. This technology has a wide range of potential uses for printed circuits, 3D polymer scaffolds for tissue engineering and advanced materials for energy harvesting storage, among others. Prometheus PCB milling machine Prometheus: This is not only a 3D printer. The desktop manufacturing space has been dominated by 3D printers for years, but other types of machines (mills, laser cutters, robotic arms, etc.) are bringing prices to amateurs and small businesses. Zippy Robotics founder Rocco Tuccio plans to bring custom printed circuit board (PCB) fabrication to engineers and electronics enthusiasts for about $2,500.The Prometheus is a desktop machine that can create real circuit boards in minutes. Tuccio hopes to provide rapid PCB prototyping capabilities to as many people as possible. What makes Prometheus PCB milling machine different? 1. The extremely small runout error allows you to precisely cut traces down to 7 mils (7 thousand inches), which means you can design with virtually any surface mount component. 2. High spindle speeds allow you to mill 3" x 5" boards in minutes (not hours)! 3. Included software gives you control over the entire tool chain, including the easy-to-use Circuit Factory design software and public API. 4. Prices are a few thousand less than similar precision machines. FAQ 1. What is a PCB in a printer? While design of a printed circuit board (PCB) can be done internally, manufacturing is generally outsourced. This dependence often results in uncontrollable, and unexpected delays. ... It is here that desktop PCB printers are aiming to come to the rescue. 2. How much does it cost to print a PCB? In general, the cost to produce a PCB will cost between $10 and $50 per board. 3. How does a PCB printer work? A special printer called a plotted printer is used to print the design of the PCB. It produces a film that shows the details and layers of the board. When printed, there will be two ink colors used on the inside layer of the board: Clear Ink to show the non-conductive areas. 4.Why are PCB green? It is due to the solder mask, which protects the copper circuits printed on the fibre glass core to prevent short circuits, soldering errors, etc. ... The colour of the solder mask gives the board its appearance. 5. How much does custom PCB cost? At BatchPCB, a two-layer board costs $2.50 per square inch (about $0.40 per square centimeter), while a four-layer board costs $8 for the same area (about $1.24/cm2). The first step in creating a custom PCB is laying out the schematic view. 6. How do I print directly from PCB? A laser printer is used to print an image of the PCB on special “transfer paper” which is then placed on the bare copperclad board and either ironed or run through a modified laminator to transfer the image to the copper. 7. What does PCB stand for? Printed circuit board. A printed circuit board, or PC board, or PCB, is a non-conductive material with conductive lines printed or etched. Electronic components are mounted on the board and the traces connect the components together to form a working circuit or assembly. 8. What is PCB made of? Copper circuitry. Printed circuit boards (PCBs) are usually a flat laminated composite made from non-conductive substrate materials with layers of copper circuitry buried internally or on the external surfaces. They can be as simple as one or two layers of copper, or in high density applications they can have fifty layers or more. 9. Which type of PCB is more economical type? Aluminum-Backed PCBs. Aluminum is inexpensive, making almost 8.23% of planet's weight, and leads to most economical manufacturing process. PCBs made up of aluminum are easily recyclable and non-toxic in nature, making them as ideal source for energy conservation. 10. How do you choose a PCB material? Electrical functionality is based on PCB function, which makes it a good criterion for design-based circuit board material selection. According to function, PCBs may be classified as the following board types: High Frequency (High Speed) – These boards can accommodate frequencies in the 500MHz – 2GHz range.

This is a technical article introducing what is operational amplifier, how does op amp works, how many types of op amp are there, and how to choose the right op amp for your circuit, and the last part, we will look at the example expressions of the op amp to better understand this device. Down below is an episode of Electronic Basics will explain the three golden rules when working with OpAmps and how to use them in order to understand and build all kind of OpAmp circuits. The main focus will be the noninverting and inverting amplifier and the comparator circuit.  Catalog  I. What is an Operational AmplifierII. How does Op Amp WorksIII. Seven Types of Op AmpIV. Op Amp Design ConsiderationV. Op Amp Examples ExpressionsVI. ConclusionFAQ  I. What is an Operational Amplifier In an actual circuit, an operational amplifier is a circuit unit with high magnification, which usually combines the feedback network to form a certain functional module. Since it was used in analog computers to realize mathematical operations, it is named "operational amplifier", more commonly known as op-amps.  An operational amplifier is a circuit unit based on its function, which can be implemented by discrete devices or semiconductor chips. With the development of semiconductor technology, the vast majority of operational amplifiers are in the form of a single chip. Nowadays, there are many kinds of operational amplifiers, which are widely used in almost all industries. Figure 1. Op Amp Diagram  II. How does Op Amp Works The operational amplifier has two input terminals a (inverse input), b (in-phase input), and one output.  There are also referred to as backward input end, non-backward input end, and output end respectively. When the voltage U- is applied to the terminal and the public end (the common end is a point where the voltage is zero, it is equal to the reference node in the circuit.), and meanwhile a terminal of the actual direction of the output voltage U is higher than that of the common terminal, the actual direction of the output voltage U is from the common end to the o terminal, that is, the direction of the two terminals is opposite.  When the input voltage U+ is added between the b terminal and the common terminal, the actual direction of U and U+ is exactly the same as that of the common terminal. For the distinction, end a and end b are divided “-” and “+”, also, don't mistake them for the positivity and negativity of the voltage reference direction. The positivity and negativity of a voltage should be marked separately or as an arrow. Figure 2. Op Amp Symbols and Terminals Inverting amplifiers and non-inverting amplifiers are shown below:Figure 3. Inverting Op Amp Fig. 4 Non-inverting Op Amp Generally, the operational amplifier can be simply regarded as a high gain direct coupling voltage amplifier unit with a signal output port (Out) and two in-phase, and inverse high impedance input terminals. Thus, an operational amplifier can be used to fabricate phase, inverse, and differential amplifiers. Operational amplifier power-supply mode can be divided into two types: dual power supply and single power supply. For a dual power-supply operational amplifier, the output can be changed on both sides of the zero voltage, and the output can also be set zero at the differential input voltage of zero. As for the single power supply, an operational amplifier that uses a single power supply, a range of input variations is between the power supply and the ground. The input potential of the operational amplifier is usually higher than a certain value of negative power supply, but lower than a value of positive power supply. Specially designed operational amplifiers can allow input potentials to vary throughout the range from negative to positive power, even slightly higher than positive power supply or slightly lower than the negative source. This operational amplifier is called a rail-to-rail input operational amplifier. The output signal of the operational amplifier is proportional to the voltage difference between the two inputs. In the audio band, the output voltage = A0 (E1-E2), where A0 is the low-frequency open-loop gain of the operational amplifier, E1 is the input signal voltage at the in-phase, and E2 is the input signal voltage at the inverse phase.  III. Seven Types of Op Amp General type: Its performance parameters are suitable for general use (low frequency and slow signal change), such asμ741A, LM358 (double OP Amp), LM324, and LF356  with FET as input stage. They are the most widely used integrated operational amplifiers. High-Z type: The characteristic of this kind of amplifier is that the input impedance of differential mode is very high and the input bias current is very small, general rid > 1GΩ~1TΩ, IB is several to dozens of picoamps. The main measure to achieve these targets is to make use of the high input impedance of FET, using FET as input stage not only has high input impedance and low input bias current but also has the advantages of high speed, wideband and low noise, however,  the input offset voltage of this kind of operational amplifier is larger. Such operational amplifier have LF356, LF355, LF347, CA3130, CA3140, etc. Low-temperature drift type: In precision instruments, weak signal detection, and other automatic control instruments, the bias voltage of the operational amplifier is small and does not change with the temperature. The low-temperature drift operation amplifier is designed for this purpose. At present, the commonly used operational amplifier has OP07, OP27, OP37, AD508, and ICL7650 composed of MOSFET devices and so on. High slew-rate type: In fast A/D converter, D/A inverter, and video amplifiers, the conversion rate of the operational amplifier must be high, and the BWG of the unity gain bandwidth must be large enough. The common operational amplifier has LM318, 175A, and so on, while the SR=50~70V/us, BWG>20MHz... Low-consumption type: Due to the wide application of portable instruments, low power supply, and low power consumption must be used. Commonly used low-power operational amplifier has TL-022C, TL-160C and so on. The operating voltage is ±2V~±18V, and the current consumption is 50 ~ 250μA. At present, the power consumption of some products has reached μW level, for example, the power supply of ICL7600 is 1.5V and the power consumption is 10mW, which can be supplied by a single battery.  High voltage and power type: The output voltage of the operational amplifier is mainly limited by the power supply. In an ordinary operational amplifier, the maximum output voltage is only dozens of volts and the output current is only dozens of Ma. In order to increase the output voltage and current, the auxiliary circuit must be added to the external circuit of the operational amplifier. High-voltage and high-power operational amplifier can output high voltage and high current without any additional circuit. For example, the power supply voltage of the D41 integrated operational amplifier can reach ±150 V, and the output current of μA791 integrated operational amplifier can reach 1A.  Programmable control type: In the usage of instruments will be involved in the measurement range problem. In order to get the fixed voltage output, we must change the magnification of the operational amplifier. For example, there is an operational amplifier with a magnification of 10 times, where the input signal is 1mv, the output voltage is 10mv when the input voltage is 0.1mv, the output is just 1mv. To obtain 10mv, the magnification must be changed to 100. A programmable control operation amplifier is to solve this problem. For example, the PGA103A changes the magnification by controlling the level of pin 1 and pin 2.  IV. Op Amp Design Consideration After knowing some basic types op amps, there are some basic questions you should ask before looking for a suitable op amp. Basics:（1）What is the input signal going to look like?（2）Current-input or voltage-input?（3）What is the expected operating frequency range? Maximum range?（4）What amplitude is needed? (Typical and maximum values.)（5）What’s the impedance of the circuit it’s going into?（6）What is an acceptable output signal going to look like?（7）What is the expected range of frequencies the output signal might cover?（8）What is the expected amplitude range?（9）Will the op-amp be driving another device? If so, how much power will be needed?（10）How accurate or precise does the op-amp need to be? The operating environment:What supply voltage(s) are available?Is there a physical size limitation? You may need to make a list of packages of an acceptable size.What is your operating temperature range? Figure out a Max, Min, and Typical. Look at how the temperature affects your most critical parameters using the graphs in the datasheet. If the information you need is missing, you can contact the company or set it aside and move on to another spec that is more thorough. Buying:Are you restricted to certain manufacturers that your company deals with?Will you need to second source the op amp?What is the lifecycle of the op amp? Do not select any op amp that is Not Recommended for New Design (NRND), End of Life (EOL), or otherwise a special factory order (this might mean that it’s about to go EOL).Price might be a specification of a sort, but this should be one of the last parameters you look at when you are deciding between otherwise identical op amps. Other points:When selecting parameters, it's good to allow a margin of error on the specifications. Not every op amp will be precisely the values as listed, and op amp values change with temperature, age, and stress. Make sure the finalists in your part selection are actually for sale. “Vapor-ware” is when a manufacturer announces a part to be released in the near future, but some parts have been known as “about to release” for a year or more, depending upon the manufacturer. That’s why you second source your product, and why you confirm the product's lifecycle prior to finalizing. V. Op Amp Examples Expressions The ADC architecture, resolution, signal bandwidth, and other specific application details are at work when understanding the various types of operational amplifiers that determine the best way to choose the best amplifiers. We consider these issues in the context of driving SAR ADC in this article. SAR ADC is the mainstay of the A-D converter world. In general, this kind of ADC is located between high resolution, low-speed incremental ADC and high speed, low-resolution pipeline ADC. By virtue of its delay-free feature, SAR ADC is often a better choice than ΔΣ ADC and pipeline ADC in applications with multiplexed signals, or applications that need to implement accurate first-time conversions after an arbitrary idle cycle (such as ATE), what's more, applications where ADC is located in a loop that requires quick feedback. In most cases, the sensor output cannot be directly connected to the SAR ADC input. An amplifier is needed to obtain the optimal SNR and distortion.  SAR ADC to sample the input to the internal capacitor and to compare the input voltage with the reference voltage with a successive binary-weighted sequence. When the switch to the sampling capacitor is open, the charge is injected into the input node due to the voltage mismatch from the sampling capacitor to the input node. A simple monopole RC filter is arranged between the amplifier and ADC. It not only used to filtering high-frequency noise and aliasing components but also to absorb this injected charge. Care must be taken when selecting cutoff frequencies for such filters. Besides, the cutoff frequency should be set at a low frequency enough, which can effectively absorb the injected charge and filter the noise, but the frequency should be high enough so that the amplifier can achieve stability within the sampling time of the data converter. Since this filter can't limit noise alone, it is generally included at the amplifier input end, and a filter with a lower cut-off frequency is also installed simultaneously. Figure 5. LTC2379 18-bit 1.8Msps  Differential Input SAR ADCSINGLE-ENDED-INPUT SIGNALSINGLE-ENDED-TO-DIFFERENTIAL DRIVER  SAR ADC Drive Differential Input SAR ADC Many of the sound performance SAR ADC use differential input to maximize the dynamic range of low power supply voltage. One such example is the LTC2379-18 shown in Fig, which operates with a 2.5V power supply and a reference of up to 5V to achieve a peak-to-peak differential input range of 10V. If the input signal is differential, all that is needed to buffer the signal and drive the ADC, or maybe a low-noise, fast, and stable dual-channel operational amplifier such as LT6203. These amplifiers are configured which as unit gain buffers for the input signal provides a high impedance input. In many cases, however, the input is single-ended and must be converted to a differential signal. This task can be easily accomplished with amplifiers such as LT6350. This type of amplifier has two stages: the first stage generates a buffered non-invert input signal and the second stage generates an inverted output. If the input signal matches the input range of the ADC, the amplifier can be used to provide a high impedance buffer for the signal, as shown in the upper part of Fig. 6(a). If the signal needs to be expanded and shifted to match the input range of the ADC, it can be done as shown in Fig. 6(b) below.  In this example, a single-ended ±10V signal is converted into a differential signal from 0 to 5V (R2 and R3 are used to shift the signal, and RIN and R1 are used to expand the signal). What is often overlooked inaccurate analog circuits is the need for a high match between gain setting and level shift resistors. If a discrete resistor with 0.1% accuracy is used, the mismatch will vary with time, temperature, and common-mode voltage range, which makes it possible that it will be the main source of the fault circuit. Using precisely matched resistors such as LT5400 will help improve this situation. The amplifier needs space between the supply voltage and the output voltage. To maintain optimal accuracy and linearity, depending on the amplifier, the output must generally be within 0.5V or more of the power rail. This means that the amplifier must be provided with a power supply voltage range wider than the ADC input range, or that the ADC must accept a limited input range from the amplifier.  ADC such as LTC2379-18 includes a "digital gain compression" function. The function sets the full scale of the ADC from the inside and the difference between the ground voltage and the reference voltage is 0.5V. This allows the use of a single 5V amplifier that matches the full scale of the ADC.  Figure 6 (a): Single-to-difference conversion using LT6350 Fig. 6(b): Single-to-difference conversion using LT6350 ADC Driving Pseudo Differential ADC Another way is when converting a single-ended analog signal to a digital signal, skipping the differential conversion completely and using a new pseudo-differential ADC, such as LTC2369-18. The shortcoming is that the noise-signal ratio of SNR which up to 6dB is lost due to a smaller input range.  Besides, differential structures are inherently easier to eliminate even harmonics. However, using it also has some important advantages. The drive circuit is simpler: it can be as simple as using a low-noise, fast, stable operational amplifier, such as LT6202, while another operational amplifier and resistor are not required to establish the inverted input. Apart from using fewer groups, the power and noise of the circuit are generally low. Because a lower noise anti-aliasing filter behind the amplifier can have a higher cut-off frequency. This makes it easier for the amplifier to achieve stability within the ADC conversion time, making it a good choice in applications where successive conversions are likely to change throughout the scale, as is the case with multiplexed signals.  It is necessary to emphasize again that the space of the amplifier must be considered-the supply voltage must be far enough away from the output of the amplifier, which can drive the signal without distortion. In other words, this means that the amplifier must be provided with a negative orbit.  One way to solve this problem is to use products such as LTC6360. This new amplifier (Fig. 7) is optimized to drive the SAR ADC with an integrated ultra-low noise charging pump that generates its own internal negative voltage rail. Although it has a single positive source, this allows the output to swing to the ground, even slightly lower than the ground. The LTC6360 maintains excellent accuracy (250V misalignment, 2.3nV/Hz noise) and is fast and stable (16-bit, 150ns). Figure 7. When using a single power source, the LTC6360 wobbles to 0V  VI. ConclusionSeveral amplifier topologies can be used to drive SAR ADC. The best choice depends on the input signal, ADC input architecture, and application details, such as whether the input signal is multiplexed. Factors to be weighed include power, complexity, performance, and speed (conversion rate and stabilization time). Choosing an op-amp requires matching your requirement to the op-amp datasheet. Blindly assuming that any op-amp will work in any circuit is only going to result in frustration and disappointment. What's more, using the right op-amp can allow you to do things you never thought were possible.  FAQ 1. What is operational amplifier and its types?An operational amplifier (op amp) is an analog circuit block that takes a differential voltage input and produces a single-ended voltage output. Op amps usually have three terminals: two high-impedance inputs and a low-impedance output port. 2. Why is it called operational amplifier?Op-amp stands for operational amplifier. ... Originally, op-amps were so named because they were used to model the basic mathematical operations of addition, subtraction, integration, differentiation, etc. in electronic analog computers. In this sense a true operational amplifier is an ideal circuit element. 3. What is the difference between amplifier and operational amplifier?Amplifiers can be either electronic or mechanical in common definition whereas operational amplifiers are electronic amplifiers. Amplifiers, in general, have a limited capability of amplifying DC signals but all op-amps are capable of amplifying DC signals. 4. What is the main function of operational amplifier?An operational amplifier is an integrated circuit that can amplify weak electric signals. An operational amplifier has two input pins and one output pin. Its basic role is to amplify and output the voltage difference between the two input pins. 5. What are the advantages of operational amplifier?Advantages: 1. increased circuit stability2. increased input impedance 3. decreased output impedance 4. increased frequency bandwidth at constant gain. 6. What are op amps used for in real life?Op amps are widely used in amplifiers oscillators, filters, comparators, integrators and differentiation,voltage regulator, current regulator. Non linear applications include precision rectified log amplifier . It is also used in analog to digital and digital to analog converter. 7. Where are operational amplifiers used?Operational amplifiers are linear devices that have all the properties required for nearly ideal DC amplification and are therefore used extensively in signal conditioning, filtering or to perform mathematical operations such as add, subtract, integration and differentiation. 8. What is an ideal operational amplifier?Operational amplifier: The ideal op amp is an amplifier with infinite input impedance, infinite open-loop gain, zero output impedance, infinite bandwidth, and zero noise. It has positive and negative inputs which allow circuits that use feedback to achieve a wide range of functions. 9. Why op-amps are better than transistors?1 Answer. A transistor is a single electronic element. ... An operational amplifier is the equivalent of many transistors and is thus able to perform much better than a single transistor (e.g. higher input impedance, lower output impedance, higher gain, differential inputs and/or differential outputs, etc.). 10. Why does an operational amplifier need a power supply?Operational amplifiers have two power supply rails because they usually need to swing bipolar - output voltages that go either positive or negative in response to the normal range of input signals. ... Without the dual supplies the output signal would clip at the ground potential. 11. How op-amp can be used as a differentiator?An op-amp differentiator is an inverting amplifier, which uses a capacitor in series with the input voltage. ... Differentiators have frequency limitations while operating on sine wave inputs; the circuit attenuates all low frequency signal components and allows only high frequency components at the output. 12. Is an op amp a transistor?Well for starters, an op amp is simply a combination of transistors, so by varying the transistor you can get different properties. One thing to also remember is that op amps are class A amplifiers which basically means that they are always on and therefore drawing power which can be undesirable. 13. Why is op amp a versatile device?Op Amps or operational amplifiers, are fundamental building blocks in electronic design, mainly because these analog integrated circuits (ICs) are very versatile. ... The term “differential amplifier,” for instance, simply means that the op amp will try to amplify any difference between the signals. 14. Does op amp need ground?An Op Amp inverting input (-) is at zero potential (A virtual ground), even though it does not have a galvanic connection to ground. 15. What is the difference between real ground and virtual ground?Real ground is when a terminal is connected physically to the ground or earth. where as virtual ground is a concept used in Op-Amps in which a node is assumed to have the potential that of the ground terminal.   You May Also LikeOperational Amplifier(OP Amp) TutorialAbout Operational Amplifier LM358: 24 Classical CircuitsA Load Insensitive High-Power Balanced Power Amplifier

In this article, we will provide you the basic introduction to FPGA and ASIC, illustrate their differences in the design, and many other complement content. CatalogI. What is FPGA?II. What is ASIC?III. What is the Difference Between FPGA and ASIC?      3.1 Difference in RTL Design      3.2 Difference in Development ProcessIV. Difference SummaryFAQI. What is FPGA?The circuit design with hardware description language (Verilog or VHDL), which can be easily synthesized and distributed, can be quickly made to FPGA for testing. It is the mainstream of modern IC design verification technology. These editable elements can be used to implement basic logic gates (such as AND, OR, XOR, NOT) or more complex combinatorial functions such as decoders or mathematical equations. In most FPGA, these editable components also contain memory elements such as triggers (Flip-flop) or other more complete memory blocks.System designers can connect blocks of logic inside FPGA via editable connections as needed as if a circuit test board had been placed in a chip. The logic blocks and connections of a finished FPGA can be changed according to the designer, so FPGA can meet the required logic functions.The speed of FPGA is generally slower than that of ASIC, and the area of realizing the same function is larger than that of ASIC. But they also have many advantages, such as quick production, modification to correct errors in the program, and cheaper costs. Vendors may also offer cheap but poorly edited FPGA. Because these chips have poor editable capabilities, the development of these designs is done on an ordinary FPGA, and then the design is transferred to a chip similar to ASIC. Another way is to use CPLD (Complex Programmable Logic Device). Learn the basics of what is an FPGA. This video discusses the history of FPGAs and how they have advanced over time. It discusses some applications that are possible. Finally it will introduce the two languages used to program FPGAs: VHDL and Verilog.  FPGA StateFPGA (Field Programmable Gate Array) is the product of further development on the basis of PAL, GAL, CPLD, and other programmable devices. As a semi-custom circuit in the field of ASIC, it not only solves the deficiency of custom circuits but also overcomes the shortcoming of the limit of the gate of the original programmable device, that is, FPGA allows unlimited programming. FPGA Parts ExplainationFPGA adopts the concept of LCA (Logic Cell Array), which includes three parts: configurable logic module (CLB), Input-Output Block(IOB), and Interconnect. FPGA is a programmable device with different structures compared with traditional logic circuits and gate arrays (such as PAL, GAL, and CPLD devices). FPGA uses a small lookup table (16×1RAM) to implement combinatorial logic. Each lookup table is connected to the input of a D-trigger, which drives other logic circuits or drives the I / O. Therefore, the basic logic unit module can realize both combinational logic function and sequential logic function. These logic units connect with mental wires or I/O contracts. In addition, the logic of FPGA is to load programming data into internal static storage units. The value stored in the memory cell determines the logical function of the logical unit and the connection between modules or between modules and I / O contracts and ultimately determines what FPGA can achieve.II. What is ASIC?An application-specific integrated circuit(ASIC) is a microchip designed for a special application, such as a special kind of transmission protocol or a hand-held computer. People might contrast it with general integrated circuits, such as the microprocessor and the random access memory chips in PCs. ASIC is used in a wide range of applications, including auto emission control, environmental monitoring, and personal digital assistants (PDAs).Mining was for a long time a GPU only game, but with ASIC miners seemingly everywhere these days, are they actually profitable? ASIC StateAt present, ASIC is considered to be a kind of integrated circuit designed for special purposes in the field of integrated circuits. An integrated circuit is designed and manufactured at the requirement of a specific user or a particular electronic system. That is, the ASIC is characterized by a request for a specific user. The ASIC is smaller in volume and lower in power consumption than that of a general integrated circuit in mass production, also has the advantages of improved reliability, improved performance, enhanced confidentiality, lower cost, and so on. Full Customization and Semi-customizationASIC is divided into full customization and semi-customization, so an ASIC can be pre-manufactured for a special application or it can be customized (typically using components from a "building block" library of components) for a particular requirement of customers.Full customization design requires designers to complete the design of all circuits, so it requires a lot of manpower and material resources, although it has good flexibility the development efficiency is low. If the design is ideal, full customization can run faster than semi-custom ASIC chips. When using the standard cell, the semi-custom can select SSI (gate), MSI (such as adder, comparator, etc.), data path (such as ALU, memory, bus, etc.),. memory and even system-level modules (e.g. multipliers, microcontrollers, etc.) ) and the IP core from the standard logic unit library. When these logic units have been laid out and designed reliably, the designer can easily complete the system design. Modern ASIC often contains a 32-bit processor, storage units like ROM, RAM, EEPROM, Flash, and other modules. Such ASIC is often called SoC(system in the chip).ASIC DevelopmentProgrammable ASIC is another characteristic branch of ASIC development. It mainly uses programmable integrated circuits such as PROM, GAL, PLD, CPLD, FPGA, or logic array to get ASIC. Its main feature is to provide software design and programming directly, completes the function of ASIC circuit, and it does not need to be processed by IC process line.There are many kinds of ASIC designs for programmable devices, which can meet different requirements. PLD and FPGA are commonly used programmable devices. It is suitable for the design of digital circuits with a short development cycle, certain complexity, and circuit scale, especially for electronic system design engineers using EDA tools for ASIC design.III. What is the Difference Between FPGA and ASIC? 3.1 Difference in RTL DesignThere are many differences between FPGA and ASIC. The logic of ASIC is usually much larger than that of FPGA. There is an order of magnitude difference in gate numbers, and the running clock is much higher than FPGA. Moreover, FPGA is relatively flexible than ASIC because it can be programmed, but only in terms of RTL design: (1) ASIC tends to be more conservative, any changes to logic needed careful consideration, and make alternative choices in case of a correction. Any modification to RTL is almost incremental, and even if the previous logic is wrong, it will not be deleted, but one more branch is made.(2) ASIC has higher requirements for coding style. Coding style requirements for all modules are consistent, thus favoring the fault check.(3) ASIC design pays more attention to the clock and reset. In particular, clocks are critical to the design of ASIC, and reset is critical to BIST testing. ASIC uses libraries to design in this respect. ASIC usually does not use a counter to divide frequencies, which can lead to unclean clocks. Unless it's a very low-frequency clock, ASIC is also much more cautious about signal processing across clock domains. The closing and opening of the clock also need to be strictly checked.(4) ASIC has to consider the problems of SCAN testing and BIST, so it is necessary to do BIST insertion for SRAM when designing and to reserve interfaces for SCAN. Although most of the interfaces are done by tools, RTL authors often have to do some top-level complex work manually, logic such as the source of the SCAN clock.(5) FPGA often uses existing IP, it needs to consider the balance of resources because there is a problem of resource waste in FPGA. ASIC rarely needed to consider this problem, the main consideration of it is its performance and power consumption, except SRAM and CLK which is related to reset in logic choice, the other are handwritten. So the logic is basically no waste, and more compact.(6) ASIC timing is more predictable and adjustable, so it can write a lot of logic. 3.2 Difference in Development ProcessThe differences between FPGA and ASIC development processes: ASIC and FPGA Design Flow ASIC and FPGA Implementation StepsThe first step is to implement functionality in a way that is generally described in HDL, such as Verilog, VHDL. Of course, small-scale circuits can also use circuit diagram input mode.The second step is to ensure the correctness of circuit functions, also known as verification. It can be realized by software simulation, hardware simulation, and so on. Software simulation is generally intuitive and easy to debug because the state of every moment can be seen, this is like debugging software programs. Hardware simulation generally refers to FPGA verification, that is, the circuit is implemented with FPGA, and then run it. The advantage of this is that it is very fast. For example, a video decoding core is used to solve a frame of the image, and software simulation can even use the best server, it still takes a lot of seconds to run, but in FPGA, it basically needs milliseconds. For a large mode verification of the circuit, is essential.The first two steps for digital IP,  the ASIC and FPGA are basically the same, unless some implementation techniques are different.The third step is, once the correctness of the circuit you describe is ensured, to implement it by turning the code you write into a real circuit, such as a register or a NAND gate, which is called synthesis. Because the circuit is becoming more and more complex, the most basic circuit is made into cells, such as register, and non-gate, so it will not be refined to the problem of how to use triode. The difference of this step is the smallest unit of the FPGA and the ASIC. FPGA is a well-made circuit, generally considering universality and efficiency, so the basic circuit unit is relatively large, such as LUT, consist of a register and NAND gate, although it uses one gate, it will take up such a unit. For ASIC, the two-input NAND gate is a simple gate circuit, even in order to distinguish the driveability and the timing characteristic difference, there are several grades, some area is small, some driveability is strong. In general, this step is to make sure your description turned into a library-based circuit description.The fourth step is, when you get a description of the circuit based on the library, you have to consider how these units are placed, which is called layout and wiring. The wiring resources of FPGA are limited, so you need to constantly adjust it to ensure the timing requirements. Map your circuit to the middle of its fixed resource map. ASIC's words are generally based on peripheral circuit requirements, timing requirements, your circuit to a certain location on the chip. After the arrangement, we have to consider whether the connection can pass, whether the delay at all levels can meet the circuit establishing and maintaining time requirements, and so on.The fifth step is output. FPGA is to output a configuration file to make the FPGA chip configure its circuit so that it can achieve the desired function. This file can be downloaded by PC after FPGA power-up, or stored in Flash, when the circuit is powered on, the automatic configuration will make. ASIC is to output a layout file to tell the manufacturer how to corrode silicon chip, how to connect metal, and so on.The sixth step is cost. ASIC has a great advantage in terms of recurring costs with less material is wasted due to the fixed number of transistors in the design. As for FPGAs, a certain number of transistor elements are always wasted although these packages are standard. This means that the cost of an FPGA is often much higher than that of an ASIC. Although the recurring cost of an ASIC is quite low, its non-recurring cost is relatively high. Although it is non-recurring, its value per IC decreases with increased volume.  A Field Programmable Gate Array can be seen as the prototyping stage of Application Specific Integrated Circuits: ASIC is very expensive to manufacture, and once it's made there is no going back (as the most expensive fixed cost is the masks [sort of manufacturing "stencil"] and their development). FPGA can reprogrammable many times, however because of the fact that a generic array of gates is connected to accomplish your goal, it is not optimized like ASIC. Also, FPGAs are natively dynamic devices in that if you power it off, you lose not only the current state but also your configuration. Boards now exist though that add a FLASH chip and/or a microcontroller to load the configuration at startup so this tends to be a less important argument. Both ASIC and FPGA can be configured with Hardware Description Languages, and sometimes FPGA is used for the end product. But generally, ASIC kicks in when the design is fixed.If you analyze the cost of production in relation to the volume, you would find that as you go lower in production numbers, using FPGA actually becomes cheaper than using ASIC.There are, of course, various auxiliary steps in the process. In general, it's all about making sure that the circuits you design are correct and implemented correctly.IV. Difference Summary FPGAASICReconfigurable circuitOne-time circuitDesign mainly with hardware description languages (HDL)Similar to the FPGAFPGA is relatively flexibleASIC tends to be more conservativeFPGA is not strict with the coding because of its programming featureASIC has higher requirements for coding styleFPGA uses small LUT to combine logic configurationASIC design pays more attention to clock and resetFPGA designers generally do not need to care for back-end designThe problems of SCAN testing and BISTFPGA uses existing IPperformance and power consumptionAnalog designs are not possible with FPGAASIC can have complete analog circuitThe speed is generally slowerRun fast than FPGAAllow unlimited programmingAn integrated circuit for a special purposeMore power consumptionMuch more power efficient than FPGA Visual Comparsion(√ means better to select)FPGAASICNRE√Performance√Design Flow√Barrier to entry√Time to market√Analog Blocks√Unit size√Power consumption√Cost per unit√FAQ 1. How do FPGAs work?In general terms, FPGAs are programmable silicon chips with a collection of programmable logic blocks surrounded by Input/Output blocks that are put together through programmable interconnect resources to become any kind of digital circuit or system. ... Unlike processors, FPGAs are truly parallel in nature. 2. What is FPGA and why it is used?FPGAs are particularly useful for prototyping application-specific integrated circuits (ASICs) or processors. An FPGA can be reprogrammed until the ASIC or processor design is final and bug-free and the actual manufacturing of the final ASIC begins. Intel itself uses FPGAs to prototype new chips.3. What is the function of FPGA?The field-programmable gate array (FPGA) is an integrated circuit that consists of internal hardware blocks with user-programmable interconnects to customize operation for a specific application.4. Is FPGA faster than GPU?Compared with GPUs, FPGAs can deliver superior performance in deep learning applications where low latency is critical. FPGAs can be fine-tuned to balance power efficiency with performance requirements.5. Is Raspberry Pi a FPGA?The main difference between the Snickerdoodle and other single-board systems like the popular Arduino and Raspberry Pi products is the inclusion of a Field Programmable Gate Array (FPGA). 6. Does FPGA have memory?The FPGA fabric includes embedded memory elements that can be used as random-access memory (RAM), read-only memory (ROM), or shift registers. These elements are block RAMs (BRAMs), LUTs, and shift registers. ... The data of the ROM is written as part of the FPGA configuration and cannot be modified in any way.7. Is FPGA a microprocessor?Microprocessor vs FPGA: A microprocessor is a simplified CPU or Central Processing Unit. ... An FPGA doesn't have any hardwired logic blocks because that would defeat the field programmable aspect of it. An FPGA is laid out like a net with each junction containing a switch that the user can make or break.8. What is FPGA and ASIC?ASIC stands for Application Specific Integrated Circuit. ... The difference in case of ASIC is that the resultant circuit is permanently drawn into silicon whereas in FPGAs the circuit is made by connecting a number of configurable blocks.9. Is FPGA better than ASIC?In general, we can say that for lower volumes' designs, FPGA flexibility allows to save costs and obtain better results; while ASICs chips are more efficient and cost effective on high volume applications.10. Which one is faster ASIC or FPGA?A single unit of an FPGA chip will be relatively larger than an ASIC chip unit. Because FPGA has its internal structure and a certain size that cannot be changed – while ASIC consists of exactly the amount of gates required for the desired application. FPGA boasts a faster time to market than ASIC.11. What are the main differences between ASIC and FPGAs?Performance and Efficiency. ASICs offer superior performance and are more efficient than FPGAs. Factors like faster speed and the ability to layer multiple functionalities onto a single chip make ASICs outperforms FPGAs. 12. Why do we need FPGA?Why Use an FPGA? ... FPGAs are particularly useful for prototyping application-specific integrated circuits (ASICs) or processors. An FPGA can be reprogrammed until the ASIC or processor design is final and bug-free and the actual manufacturing of the final ASIC begins. Intel itself uses FPGAs to prototype new chips.13. Is ASIC a CPU?CPUs and microprocessors are the same thing. ASIC is just a general term for a microchip. CPUs are technically ASICs, but much simpler devices can be implemented on an ASIC too.14. What is the most preferred FPGA variant?Verilog is currently the most popular. Verilog creates a level of abstraction to hide away the details of its implementation. Verilog has a C-like syntax, unlike VHDL.15. What is ASIC technology?An application-specific integrated circuit (ASIC /ˈeɪsɪk/) is an integrated circuit (IC) chip customized for a particular use, rather than intended for general-purpose use. ... ASIC chips are typically fabricated using metal-oxide-semiconductor (MOS) technology, as MOS integrated circuit chips. 16. When should ASIC and FPGA devices be used?If your application requires constant bug fixes, feature and design changes, and software flexibility, then FPGAs may be the right solution. If your end application requires high performance, smaller device footprint, and significantly lower power consumption, then ASICs are your best bet. 17. How does an ASIC work?ASICs allow miners to use hardware made specifically for Bitcoin or other SHA-256 algo coins. An ASIC has benefits over CPU, GPU and FPGAs due to being designed for one specific task. They are able to mine Bitcoin at a higher hash rate (speed of processing transactions) than CPUs, GPUs and FPGAs.18. Why use an FPGA instead of a CPU or GPU?This is where FPGAs are much better than CPUs (or GPUs, which have to communicate via the CPU). With an FPGA it is feasible to get a latency around or below 1 microsecond, whereas with a CPU a latency smaller than 50 microseconds is already very good. Moreover, the latency of an FPGA is much more deterministic. 19. Why is ASIC needed?ASICs are designed specifically for one client to provide a function required by the client's end product. For example, a cell phone company may design an ASIC to combine the display backlight controller with the battery charging circuit into a single IC in order to make the phone smaller.20. What is better ASIC or GPU?In short: ASICs are best for mining Bitcoin, Litecoin, Dash, and coins that are based off these algorithms. GPUs are best for mining Ethereum, Monero, Ravencoin, and coins based off those algorithms. Note: Over time all of these coins will produce less thanks to halvings which cut the reward for mining blocks in half.You May Also LikeDiscussion on the influencing factors of clock in FPGA designNew SoM Combination Design Based on Processor and FPGA: FPGA and Processo