Patent ID: 6208849
Filing Date: 2001-03-27
Classification: H04B

Abstract:
A receiver with suppressed intermodulation distortion for a radio communication terminal, comprising:a low noise amplifier for amplifying a received radio frequency signal, an operating power thereof being increased to reduce an intermodulation distortion signal in response to a first control signal;a radio frequency bandpass filter for bandpass-filtering signals in a reception frequency band out of the signals output from the low noise amplifier;a mixer for mixing an output of the radio frequency bandpass filter with a local oscillation signal to generate an intermediate frequency signal by down-converting the output of the radio frequency bandpass filter;an intermediate frequency amplifier for amplifying the intermediate frequency signal output from the mixer, an operating power thereof being increased to reduce the intermodulation distortion signal in response to a second control signal;an intermediate frequency bandpass filter for bandpass-filtering an intermediate frequency signal out of the signals output from the intermediate frequency amplifier;a demodulator and signal processor for demodulating and processing the intermediate frequency signal output from the intermediate frequency bandpass filter to generate a received signal strength indicator (RSSI) signal and a signal-to-noise ratio signal; anda controller having a reference RSSI signal and a reference signal-to-noise ratio signal stored therein, for comparing the RSSI signal and the signal-to-noise ratio signal with the reference RSSI signal and the reference signal-to-noise ratio signal to determine whether a reception sensitivity is poor, and generates in sequence said first and second control signals if the reception sensitivity is poor.