Patent ID: 8068536

Claim:
A digital radio frequency (RF) transceiver circuit, comprising: a converter circuit that samples a receiver input signal; circuitry that is adapted to select between a transmitter input signal and the sampled receiver input signal, the transmitter input signal including a real portion and an imaginary portion; a filter, the filter being adapted to receive both the transmitter input signal and the sampled receiver input signal, the filter adapted to produce either a filtered transmitter signal or a filtered receiver signal, the filter further including at least two filter elements operating in parallel; and circuitry that alternatively receives the filtered transmitter signal or the filtered receiver signal and produces a modulated output and a demodulated output, the demodulated output including a real portion and an imaginary portion, wherein the filter operates at a sampling frequency that is lower than the sampling frequency of the converter and the circuitry that produces the modulated output.