Patent ID: 8279955

Claim:
A DC calibration circuit for a receiver, the DC calibration circuit being configured to receive a digital multi-carrier modulated (MCM) signal that includes a sequence of MCM symbols, the DC calibration circuit comprising: an accumulator to determine an estimated DC offset of a first MCM symbol in the sequence of MCM symbols, wherein the accumulator receives a plurality of digital samples that comprise the first MCM symbol and determines the estimated DC offset by calculating an average of the plurality of digital samples, wherein the accumulator comprises: a multiplier to divide each of the plurality of digital samples by a total number of digital samples to output a plurality of divided samples; and an accumulator memory element coupled in a feedback loop with a summation element, the accumulator memory element to accumulate a sum of the plurality of divided samples as the estimated DC offset; a compensator to remove the estimated DC offset from a second MCM symbol in the sequence of MCM symbols; a first timer switch configured to pass the digital MCM signal to the accumulator while the first MCM symbol is received by the DC calibration circuit; and a second timer switch configured to pass the estimated DC offset from the accumulator to the compensator, such that the estimated DC offset is applied to the digital MCM signal by the compensator while the second MCM symbol is received by the DC calibration circuit.