Patent ID: 7433665

Claim:
A communication circuit for a network transceiver, comprising: a first sub-circuit having a first input which receives a composite differential signal including first and second differential signal components, a second input which receives a differential replica transmission signal, and an output which provides a differential receive signal which comprises the composite differential signal minus the differential replica transmission signal; a second sub-circuit which produces first and second single-ended replica transmission signals which together substantially comprise a replica of the first differential signal component of the composite differential signal, wherein when one of the first and second single-ended replica transmission signals is asserted, the other of the first and second single-ended replica transmission signals has a value of zero, wherein the second sub-circuit is configured to generate a current signal, wherein the first differential signal component of the composite differential signal comprises the current signal, wherein voltage signals are derived in accordance with the current signal, and wherein the first and second single-ended replica transmission signals comprise the voltage signals; and a third sub-circuit, which is coupled to the first and second sub-circuits, and which produces the differential replica transmission signal from the first and second single-ended replica transmission signals, wherein the third sub-circuit includes only a single differential operational amplifier.