Patent ID: 7180950

Claim:
A circuit connected between a module and a pair of wires, the circuit comprising: a first connection line for connection to a first wire in the pair of wires; a second connection line for connection to a second wire in the pair of wires; radio frequency termination circuitry coupled between the first connection line and the second connection line; a first transformer having a first inductance and a second inductance, a first end of the first inductance being coupled to the first connection line and a first end of the second inductance being coupled to the second connection line; a second transformer including: a first inductance, the first inductance of the second transformer being coupled between a second end of the first inductance of the first transformer and a second end of the second inductance of the first transformer, and a second inductance that includes a tap line; and, a feedback cancellation filter coupled to the first end of the second inductance of the second transformer, the second end of the second inductance of the second transformer, the first connection line and the second connection line, the feedback cancellation filter being used to cancel common-mode noise on the first connection line and the second connection line.