Abstract
The invention discloses a frequency down conversion method of wireless receiver and frequency down conversion method thereof, which utilize a pre selector to select signal in the band range, further select corresponding local oscillation frequency according to different channel code and then sequentially proceed frequency drop and filtering to the signal by using a frequency down converter to refer to local oscillation frequency to acquire a low band signal. Further go through a low pass filter to filter the low band signal, amplify gain of a limiter and demodulation of a frequency discriminator for acquisition of a base band signal. The invention focuses on simplifying sophistication of equipment and fast channel switching to attain goal of multi-channel and single channel receiving and excellent capability against interference.