Patent ID: 8270538

Claim:
A receiver comprising: a low noise amplifier (LNA) amplifying a received radio (RF) signal while minimizing amplification of noise included in the received RF signal; a mixer down-converting a frequency of an output signal of the LNA to output an intermediate frequency (IF) signal; a frequency synthesizer generating a predetermined frequency signal for the frequency-down conversion of the mixer and outputting the predetermined frequency signal to the mixer; a bandpass filter passing a necessary band of a channel in an output signal of the mixer; a log amplifier amplifying an output signal of the bandpass filter in log scale and outputting a received signal strength indicator of an output signal of the bandpass filter; a detector comparing an output of the log amplifier with a predetermined binary threshold value, outputting a first binary signal when the output of the log amplifier is less than the predetermined binary threshold value, and outputting a second binary signal when the output of the log amplifier is equal to or greater than the predetermined binary threshold value; a switch serially connected with an output terminal of the detector; and a switch controller comparing the received signal strength indicator of the output signal of the log amplifier with an RSSI threshold, opening the switch when the received signal strength indicator is less than the RSSI threshold, and closing the switch when the received signal strength indicator is equal to or grater than the RSSI threshold.