| 摘要 |
A circuit is connected between a module and a pair of wires. The circuit includes a first connection line, a second connection line, radio frequency termination circuitry, a first transformer, a second transformer, a tapped inductance and a feedback cancellation filter. The first connection line is for connection to a first wire in the pair of wires. The second connection line is for connection to a second wire in the pair of wires. The radio frequency termination circuitry is connected between the first connection line and the second connection line. The first transformer has a first inductance and a second inductance. A first end of the first inductance is coupled to the first connection line. A first end of the second inductance is coupled to the second connection line. The second transformer includes a first inductance and a second inductance. The first inductance of the second transformer is 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. The second inductance of the second transformer includes a tap line. The feedback cancellation filter is coupled to the second transformer, the first connection line and the second connection line.
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