Patent ID: 7327995
Filing Date: 2008-02-05
Classification: H04B

Abstract:
1. A transmit canceller in a communication channel, the channel including a first transceiver for transmitting and receiving signals and a replica transmitter for generating an input replica transmission signal, a composite signal at a near end comprising a transmission signal of the first transceiver and a signal received from a second transceiver, said transmit canceller comprising: an operational amplifier having a first polarity input terminal, a second polarity input terminal, and an output terminal; a feedback element in communication with the second polarity input terminal and the output terminal; a first input resistor in communication with the second polarity input terminal and the measured signal input; a second input resistor in communication with the second polarity input terminal and the replica signal input; and a predetermined voltage source in communication with the first polarity input terminal of the operational amplifier, wherein the received signal is an output at the output terminal of the operational amplifier.