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晶体鉴频器是利用压电晶体阻抗的频率敏感特性制成的.由于压电晶体固有的高稳定度,使晶体鉴频器具有许多独特的优点:鉴频特性十分稳定,鉴频灵敏度高,以及功耗很小.因此,晶体鉴频器在现代接收机中获得了越来越广泛的应用. 晶体鉴频器可分窄带与宽带两种类型.前者是现代连续波多卜勒接收机的重要构成部分;后者在调频通信接收机中可用来检测调频信号. 本文对窄带及宽带晶体鉴频器的工作原理、鉴频特性作一概略的介绍与分析,并给出某些实用电
Crystal frequency discriminator is the use of piezoelectric crystal impedance of the frequency-sensitive properties made of piezoelectric crystal because of the inherent high stability, so that the crystal frequency discriminator has many unique advantages: frequency discrimination is very stable, high frequency sensitivity, And the power consumption is very small.Therefore, the crystal frequency discriminator has been more and more widely used in modern receivers.The crystal frequency discriminator can be divided into two types: narrow band and wide band.The former is the important of the modern continuous wave Doppler receiver Which can be used to detect the FM signal in the FM communication receiver.This paper introduces and analyzes the operating principle and frequency discrimination characteristics of the narrowband and wideband crystal frequency discriminators and gives some practical examples