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鉴相器是锁相环的重要部件之一,其功能是检出输入信号与压控振荡器输出信号之间的相位差,变换成电压,用以控制压控振荡器的振荡频率。近年来,数字式鉴相器日益发展。由于这类鉴相器线性范围宽,输出纹波小,电路组成简单,易于集成化,调试方便,且大都兼有鉴频功能,在频率合成器中得到了广泛的应用。自931电流型鉴相器引入以来,国内对它的分析讨论有多篇报导,Racal公司也发表过该鉴相器的设计方法。另一种国外普遍使用的电压型集成化鉴相器MC4044,
The phase detector is one of the important parts of the phase-locked loop. Its function is to detect the phase difference between the input signal and the output signal of the voltage-controlled oscillator and convert it into a voltage for controlling the oscillation frequency of the voltage-controlled oscillator. In recent years, the digital phase detector is growing. Due to the wide linear range of such phase detector, the output ripple is small, the circuit is simple, easy to integrate, easy to debug, and most of both frequency discrimination, has been widely used in the frequency synthesizer. Since the introduction of the 931 current-mode phase detector, there have been many reports on its analysis and discussion in China, and Racal has also published the design method for this phase detector. Another commonly used abroad voltage type integrated phase detector MC4044,