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用作鉴相器的锁相环图1所示为简单的一阶锁相环,它可用作鉴相器。其误差电压中包含与输入信号的任一调制相位或调制频率相应的分量。当压控振荡器被输入的误差信号锁定时,就产生这个分量。同样,图2所示的二阶锁相环可以用作解调器。在这种解调器中,低通滤波器的带宽可以提供某些接收机的选择性,但也会影响接收机的阈限制性。本作者详细研究了锁相环解调器的阀
Phase-Locked Loop for Phase Detector Figure 1 shows a simple first-order phase-locked loop that can be used as a phase detector. The error voltage contains a component corresponding to either the modulation phase or the modulation frequency of the input signal. This component is generated when the voltage-controlled oscillator is locked by the input error signal. Similarly, the second-order phase-locked loop shown in Figure 2 can be used as a demodulator. In this demodulator, the bandwidth of the low-pass filter can provide some receiver selectivity, but it can also affect the threshold limit of the receiver. The author studied in detail the phase-locked loop demodulator valve