Patent ID: 8676140

Claim:
A system for controlling a radio frequency (RF) gain of a receiver that reduces a time taken to maintain an input signal level at an optimum dynamic range, said system comprising: a tuner that receives an RF signal and down-converts said RF signal to an intermediate frequency (IF) signal, said tuner comprising: a radio frequency programmable gain amplifier (RF_VGA); a filter that rejects an out-of-band signal from said IF signal to obtain a filtered IF signal; and an intermediate frequency programmable gain amplifier (IF_VGA); a demodulator coupled to said tuner, said demodulator comprising: an analog to digital converter (ADC) that: (i) converts said filtered IF signal to a digital signal; and (ii) samples said digital signal under oversampling conditions to obtain an oversampled signal that comprises an in-band signal and said out-of-band signal; and an Automatic Gain Control (AGC) unit that: (i) receives said digital signal and obtains an IF gain of said IF_VGA; (ii) controls said RF_VGA and said IF_VGA; and (iii) measures an RF energy for said RF signal based on said IF gain of said IF_VGA.