Patent ID: 7024221

Claim:
A receiver digital circuitry, comprising: digital down-converter circuitry configured to mix a digital input signal provided by a receiver analog circuitry with a digital intermediate frequency (IF) local oscillator signal to generate a digital down-converted signal; and digital filter circuitry configured to filter the digital down-converted signal to generate a filtered digital signal, wherein the digital filter circuitry provides a notch at a frequency that corresponds to a residual DC offset of the receiver analog circuitry, and wherein the digital filter circuitry provides the notch by using a notch filter circuitry that has one or more poles the locations of which are adjustable over an adjustment cycle of the notch filter circuitry, and wherein the locations of the one or more poles of the notch filter circuitry are adjusted in an initial part of the adjustment cycle of the notch filter circuitry so that the notch filter circuitry tends to settle quickly.