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锁相环的频率响应根据输入相位调制频率的不同,可分为调制跟踪和载波跟踪。首先分析了利用锁相环的这两种跟踪特性分别实现调频信号解调的原理。然后基于VisSim仿真软件建立了锁相环的仿真模型,并对基于两种跟踪特性的锁相环解调功能进行了仿真,给出了仿真波形。通过采用这种方式可以帮助学生对相关内容的理解,从而为今后进行锁相环电路的设计与应用打下良好的基础。
Phase-locked loop frequency response according to the input phase modulation frequency can be divided into modulation tracking and carrier tracking. First of all, the principle of demodulating the FM signal using the two tracking characteristics of PLL is analyzed respectively. Then the simulation model of PLL was established based on VisSim simulation software. The phase-locked loop demodulation function based on two tracking characteristics was simulated and the simulation waveform was given. By adopting this method, students can understand the related contents and lay a good foundation for the design and application of the PLL circuit in the future.