Patent ID: 8331892

Claim:
An apparatus for processing a received radio frequency (RF) signal, comprising: an RF device for processing the received RF signal to generate a downconverted signal; an energy estimator coupled to the RF device for providing a signal related to an energy estimate of the received RF signal; an automatic gain control (AGC) module comprising the energy estimator and a digital variable gain amplifier (DVGA), the DVGA of the AGC module for controlling the gain of the RF device based on the energy estimate signal; a fine DC compensation module coupled to the RF device for performing fine adjustment of a DC component in the downconverted received signal, wherein a signal output from the DVGA of the AGC module controls the fine DC compensation module to perform the fine adjustment; a coarse DC compensation module coupled to the RF device for performing coarse adjustment of the DC component in the downconverted received signal, wherein a signal output from the DVGA of the AGC module controls the coarse DC compensation module to perform the coarse adjustment; an analog-to-digital converter (ADC) coupled to the RF device for converting the downconverted received signal from an analog domain to a digital domain; and a digital gain module coupled to the ADC and adapted to adjust the level of the downconverted received signal in the digital domain, wherein the AGC module is adapted to control the digital gain module based on the energy estimate signal.