Frequency converter and radio receiver using same (Frequency Converter and Radio Receiver Using the Same)

摘要

A frequency converter capable of being driven with a small local oscillation signal while avoiding magnetic mixing problems of a direct conversion receiver and a radio receiver using the same.;The frequency converter includes: a signal synthesizing means (10) for synthesizing the first input signal and the second input signal to synthesize the first input signal and the second input signal, and outputting a composite signal obtained by removing the frequency even-numbered noise of the second input signal; (20) configured to amplify a synthesized signal output from the signal synthesizing means and output an amplified signal having a constant amplitude, and an amplifying means for receiving an amplified signal output from the amplitude limiting amplifying means and outputting an unnecessary signal And a filter means (30) for generating and outputting a passband signal containing only necessary signal components. Further, the radio signal generator 60 using the frequency converter having the above-described configuration inputs the output of the local oscillator to the variable attenuator or the variable gain amplifier, and outputs the output of the variable attenuator or the variable gain amplifier as the first input signal to the frequency converter Gain control is performed by inputting.