Patent ID: 7221918
Filing Date: 2007-05-22
Classification: H04B,H04L

Abstract:
1. A radio-frequency (RF) receiver comprising: a radio-frequency (RF) down-converter capable of receiving an input radio frequency (RF) signal and down-converting the input RF signal to a lower frequency analog signal; analog processing circuitry capable of receiving the lower frequency analog signal from the RF down-converter and outputting a processed analog signal, wherein the processed analog signal includes a DC-offset signal; an analog-to-digital converter (ADC) circuit capable of converting the processed analog signal to a sequence of digital samples; and a DC-offset correction circuit capable of detecting the DC-offset signal in a digital output signal of the RF receiver and, in response to the detection, adding a DC-offset correction signal to the lower frequency analog signal, wherein addition of the DC-offset correction signal to the lower frequency analog signal reduces the DC-offset signal in the processed analog signal, and wherein the DC-offset correction signal is determined when a gain of at least one amplifier in the analog processing circuitry is at a maximum value.