Common mode chokes are used to suppress electromagnetic interference (EMI) by filtering out common mode noise in differential signal lines, ensuring signal integrity and reducing noise in communication systems.
Common mode chokes are designed to block common mode signals (noise that appears equally on both lines) while allowing differential signals (the actual data signals) to pass through, whereas differential mode chokes focus on filtering out noise that affects the differential signals.
When selecting a common mode choke, factors to consider include the choke's inductance value, current rating, frequency response, size, and the specific EMI requirements of the application to ensure optimal performance.