Patent ID: 7583765

Claim:
A method for detecting and canceling DC offset in a receiver, comprising: downconverting a received signal to a baseband level signal; providing the baseband level signal to a first filter system to generate a first filtered signal; converting the first filtered signal to a digital signal at a first sampling rate to develop a DC estimate signal representative of any direct current (DC) component present on the downconverted received signal; providing the digital signal to a second filter system to generate a second filtered signal and develop a second sampling rate, where the first sampling rate is significantly higher than the second sampling rate; developing the DC estimate signal in the digital domain; converting the DC estimate signal to an analog signal; applying the analog DC estimate signal to cancel any DC component present on the downconverted received signal; and applying the DC estimate signal in the digital domain to cancel any residual DC component present on the downconverted received signal.