锁相环工作原理及仿真分析

Phase-locked loop principle and simulating analysis

为了探究锁相环的工作本质,在构建数学模型的基础上,求出了环路的相位误差响应,并利用零输入和零状态响应的含义引申出环路的工作性能。从定量与定性两方面说明了锁相环既可调频又可调相的实质。接着,为了更进一步加深理解,又从电荷泵锁相环的角度,介绍了原理,并用仿真实例加以验证。从而说明,当进行频道转换时,环路首先进行调频,即粗调。在调好频段后,再细调,即调相。最终达到同频同相的同步状态,保证了环路正常稳定的工作。

In order to explore the nature of the work of phase-locked loop,In building a mathematical model based on the PLL,the article finds the loop phase error of zero input and zero-state response,then utilizing the zero input and zero-state response of the meaning of work derives out the loop performance.Both quantitative and qualitative substance of the work of the PLL is the loop can either FM modulation or phase modulation.In general,the loop first for FM,that is coarse.In the adjusted basis of a good band,and then fine-tune the phase modulation.Thus,it can achieve the same frequency and phase synchronization states,guarantee the normal loop stability.