Patent ID: 8180308

Claim:
A radio frequency receiver, comprising: an antenna configured to receive a radio frequency signal; a first amplifier configured to operate with one of a first gain and a second gain, wherein the first amplifier is configured to amplify the radio frequency signal to generate a first amplified signal; a first mixer configured to generate an intermediate frequency signal in response to the first amplified signal; an second amplifier configured to amplify the intermediate frequency signal to generate a second amplified signal; a received signal strength indicator circuit configured to (i) determine a strength value based on a gain of the radio frequency receiver, and (ii) generate a strength indication signal based on the strength value; a first detection circuit configured to (i) determine if the second amplified signal is an out-of-band signal, and (ii) generate a first detection signal based on whether the second amplified signal is an out-of-band signal, wherein the first detection circuit is configured to determine the second amplified signal is an out-of-band signal when (i) the first amplifier is operating with the first gain, and (ii) the strength indication signal is less than a first threshold, and wherein the first detection circuit is configured to determine the second amplified signal is an out-of-band signal when (i) the first amplifier is operating with the second gain, and (ii) the strength indication signal is less than a second threshold; and a controller configured to adjust gain of the second amplifier in response to the first detection signal.