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Q.What is the difference between common mode and differential mode?

EMC Components >  EMC Components >  Common Mode Filters / Chokes

A. The common mode refers to signals or noise that flow in the same direction in a pair of lines.
The differential (normal) mode refers to signals or noise that The common mode refers to signals or noise that flow in the same direction in a pair of lines.
The differential (normal) mode refers to signals or noise that flow in opposite directions in a pair of lines.

As an example for convenience, consider a configuration where two copper wires are wound around a ring-shaped ferrite core. In this structure, two patterns may exist: one where the currents in the wires flow in the same direction, and another where they flow in opposite directions. These two patterns are “common mode” and “differential mode”.

“common mode” and “differential mode”

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