Patent ID: 7095348

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, wherein the receive section is configured to receive a composite signal, the accumulated replica output signal, and a baseline wander correction signal, and wherein the active summer is configured to sum the composite signal, the accumulated replica output signal and the baseline wander correction signal.