Patent ID: 8737278

Claim:
A full-duplex wire-line transceiver with echo cancellation line driver, the transceiver comprising: an impedance matching network having a network interface, and a transmit interface to accept a differential transmit signal for transmission via the network, where the differential transmit signal comprises a first transmit signal and a first differential transmit signal opposite in phase to the first transmit signal, the impedance matching network having a receive interface to supply a differential receive signal accepted at the network interface, where the transmit interface is coupled to the receive interface; a hybrid circuit having an input to accept the differential receive signal combined with a coupled differential transmit signal, and input to accept a differential echo cancellation (EC) signal comprising a first EC signal and first differential EC signal opposite in phase to the first EC signal, the hybrid circuit having an output to supply the differential receive signal with the coupled differential transmit signal attenuated in response to the differential EC signal; and, a line driver comprising: a first operational amplifier (OPA) having an input to accept a first input signal and an output to supply a first output voltage; an output to supply the first transmit signal; an output to supply the first EC signal, where the first transmit signal and first EC signal are both responsive to the first output voltage; a second OPA having an input to accept a first differential input signal opposite in phase to the first input signal, and an output to supply a second output voltage; an output to supply the first differential transmit signal; an output to supply the first differential EC signal, where the first differential transmit signal and first differential EC signal are both responsive to the second output voltage, and opposite in phase, respectively, to the first transmit signal and first EC signal.