Magnetic interface circuit having a 3-wire common mode choke

摘要

A magnetic interface circuit for interfacing between a cable side and a circuit side of a networking communication channel. The magnetic interface circuit includes a transformer and a 3-wire common mode choke (CMC). The transformer has a first winding connected to the cable side of the channel and a second winding connected to the circuit side of the channel. Each of the first and second windings has two output ports. The 3-wire CMC has a center winding and two outer windings respectively connected to the output ports of the first or second winding. The center winding has two opposite ends both used for connecting to ground.

主权项

1. A magnetic interface circuit for interfacing between a cable side and a circuit side of a networking communication channel, comprising:
a transformer having a first winding electromagnetically connected to the cable side of the channel and a second winding connected to the circuit side of the channel, each of the first and second windings having two output ports; and a 3-wire common mode choke having a center winding and two outer windings, the two outer windings being respectively connected to the two output ports of the first or second winding, the center winding having two opposite ends directly connected to ground; wherein the first winding has a first center tap connected to ground through a discharge device.