Patent ID: 8169546

Claim:
An automatic gain control (AGC) loop circuit comprising: a low noise amplifier (LNA) that amplifies a wideband radio frequency signal; a received signal strength indication (RSSI) unit that detects signals and blockers adjacent to said radio frequency signal, wherein said RSSI unit is coupled to said LNA; a radio frequency AGC control unit that lowers a gain of said radio frequency signal; a mixer that mixes a local oscillator (LO) signal with said radio frequency signal; a bandpass filter that filters additional signal blockers adjacent to said radio frequency signal received from said mixer; a post mixer amplifier (PMA) that amplifies an input signal of said PMA, wherein said PMA comprises a high gain state and low gain state; a variable gain amplifier (VGA) that continuously varies a gain of an intermediate frequency signal; an analog-to-digital converter (ADC) that converts said intermediate frequency signal into a digital output signal; and an intermediate frequency AGC control unit that feeds said digital output signal to said PMA and compares said digital output signal with predefined thresholds comprising an upper threshold and a lower threshold, wherein said PMA is switched to said high gain state when an input of said VGA is greater than said upper threshold, and wherein said PMA is switched to said low gain state when an input of said VGA is lower than said lower threshold.