Wire Wound Common Mode Filters

The wire wound common mode interference suppression filter specifically suppresses common mode interference (CMI) in electronic circuits. In contrast to chip inductors, they consist of a ferrite core around which a wire is precisely wound. Common-mode interference occurs in phase on both conductors of a differential signal pair and can impair signal integrity. The wire-wound common mode interference suppression filter uses the principle of magnetic coupling to eliminate CMI. When common mode interference flows through the coil, a magnetic field is created in the ferrite core. This magnetic field in turn induces an opposing voltage in the coil which effectively removes the common mode interference.