基于VisSim的锁相环跟踪性能仿真

Simulation of Tracking Performance of Phase Locked Loop Based on VisSim

锁相环的跟踪性能是"锁相技术"课程教学中的重点内容。本文首先对锁相环的跟踪性能进行理论分析,然后基于VisSim仿真软件建立了二阶锁相环的仿真模型,并对锁相环的跟踪性能进行了仿真。给出了锁相环的输入信号存在相位阶跃和频率阶跃两种情况下的相位误差变化曲线和动态跟踪输出波形。通过仿真,学生更容易理解锁相环的动态跟踪性能,有助于为今后工作中进行锁相环电路的设计与应用打下良好的基础。

PLL tracking performance is an essential part of teaching PLL technology. The PLL trackingperformance is firstly analyzed theoretically,and a second order PLL simulation model is established based on VisSimsoftware,then the PLL's tracking performance is simulated. The phase error curve and dynamic tracking waveform aregiven when there is a phase step or a frequency step in the input signal's phase. Through simulation,students are morelikely to understand the dynamic tracking performance of PLL,and it is very helpful to the students for the PLLcircuit design and application in the future.