Patent ID: 7894786

Claim:
A gain controlled receiver, comprising: a low noise amplifier amplifying a received RF (radio frequency) signal in response to a first gain control signal; a first variable gain control amplifier amplifying a signal output from the low noise amplifier in response to a second gain control signal; a frequency mixer mixing a signal output from the first variable gain control amplifier with a local oscillating signal in response to a third gain control signal to generate an IF (intermediate frequency) signal; a filter removing noise in an output signal of the frequency mixer in response to a fourth gain control signal; a second variable gain control amplifier amplifying an output signal of the filter in response to a fifth gain control signal, and including one or more variable gain amplifiers; and a gain control block processing the received output signal of the frequency mixer and the output signal of the filter to generate the first to fourth gain control signals, wherein the gain control block comprises: a first gain control block generating the first to third gain control signals according to a state of the output signal of the frequency mixer; and a second gain control block generating the fourth gain control signal according to a state of the output signal of the filter.