PLL (phase locked loop) is an important module in modern communication systems. The simulations of PLL based on the Visual System Simulation platform were given, which are introduced into classroom teaching and experiment. The PLL models were given, then a complete PLL system was constructed, the design of loop filter and simulation waveforms were also given. The practice shows that using this approach can help students to understand the contents well and they can have a good foundation for future work.%给出了基于VSS平台的锁相环仿真过程,并将其引入课堂教学和实验.同时给出了锁相环的仿真模型,构建了完整的锁相环系统,并给出了仿真波形与环路滤波器设计方法.实践证明,采用这种方式可以帮助学生对相关内容的理解,并为今后进行系统设计工作打下良好的基础.
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