Patent ID: 7312739

Claim:
A communication circuit, comprising: a decoder configured to receive input signals and to provide T decoded signals; a transmit section, wherein the transmit section comprises: T sets of transmit circuits arranged in parallel, wherein each of the T sets of transmit circuits is configured to receive a respective one of the T decoded signals, wherein each of the T sets of transmit circuits comprises a digital-to-analog converter (DAC) and is configured to provide a transmit output signal, wherein each DAC comprises: N current sources arranged in parallel and in a differential configuration, wherein each of the N current sources includes a respective control input, and wherein the transmit output signal provided by the DAC comprises a sum of outputs of the N current sources; and M delay elements, wherein an input of a first one of the M delay elements and the control input of a first one of the N current sources are configured to receive the respective one of the T decoded signals, wherein an mth one of the M delay elements includes an input in communication with an output of an m−1th one of the M delay elements, wherein the output of one of the M delay elements controls a corresponding control input of one of the N current sources, wherein a sum of the transmit output signals from the T sets of transmit circuits forms an accumulated output signal, wherein each of the T sets of transmit circuits comprises a replica circuit and is configured to provide a replica output signal, wherein each replica circuit comprises: N replica current sources arranged in parallel and in a differential configuration, wherein each of the N replica current sources includes a respective control input, wherein the control input of a first one of the N replica current sources is configured to receive the respective one of the T decoded signals, wherein the output of the one of the M delay elements controls a corresponding control input of one of the N replica current sources, wherein the replica output signal comprises a sum of outputs of the N replica current sources, and wherein a sum of the replica output signals from the T sets of transmit circuits forms an accumulated replica output signal; and a receive section, wherein the receive section comprises: an active summer that communicates with a voltage to current converter, wherein the receive section is configured to receive a composite signal, the accumulated replica output signal and an output of the voltage to current converter, and wherein the active summer is configured to sum the composite signal, the accumulated replica output signal and the output of the voltage to current converter.