Patent ID: 7016489

Claim:
A transceiver interface circuit configured to transmit and receive information, the circuit further configured to perform echo-cancellation, comprising: a digital signal processor (DSP) configured to digitally process information from a data source and to generate a transmit signal, the DSP further configured to receive and process a receive signal and a transmit error signal; an analog front end (AFE) coupled with the DSP, the AFE configured to modify the transmit signal, the receive signal, and the transmit error signal; a line driver coupled with the AFE, the line driver configured to amplify the modified transmit signal and to produce the transmit error signal; and where the line driver comprises an inverting differential unity gain amplifier and where said transmit error signal is produced directly from the differential virtual ground input of said amplifier; and a hybrid network coupled with the line driver and the AFE, the hybrid network configured to transmit, via a transmission line, the amplified transmit signal output from the line driver and to forward the receive signal received from the transmission line to the AFE, the hybrid network further configured to isolate the amplified transmit signal from the receive signal.