Patent ID: 7995980
Filing Date: 2011-08-09
Classification: H03G,H04B

Abstract:
1. An automatic gain control apparatus for controlling a radio frequency amplifier and an intermediate frequency amplifier, comprising: a first comparing module, for comparing an input signal with a first threshold level and a second threshold level to generate a first compared output signal and a second compared output signal respectively; a counting module, coupled to the first comparing module, for performing a first counting operation upon the first compared output signal to generate a first counting number, and performing a second counting operation upon the second compared output signal to generate a second counting number; a second comparing module, coupled to the counting module, for comparing the first counting number with a first threshold number to generate a first detection signal, and comparing the second counting number with a second threshold number to generate a second detection signal; and a control module, coupled to the second comparing module, the radio frequency amplifier and intermediate frequency amplifier, for controlling the gain of the radio frequency amplifier or the intermediate frequency amplifier according to the first detection signal and the second detection signal.