随着近年来数字技术的进步,锁相环也不断数字化。其中,由微处理器与软件构成的数字信号处理(DSP)型数字锁相环有其独有的优点,如:在一个环中由于分时操作可以进行任意多重使用,可以在使用时自由地设定、改变其特性,等等。因此,可以预料,它将会极大地适用于今后的数字通信方式的同步、信号变换电路等方面。但是,以前的 DSP 数字锁相环只是简单地把模拟锁相环的工作取代 With the progress of digital technology in recent years, the phase-locked loop is also continuously digitized. Among them, a digital signal processing (DSP) type digital phase locked loop composed of a microprocessor and software has its own unique advantages, such as: any multiple use in a ring due to time-sharing operation can be freely used Set, change its characteristics, and so on. Therefore, it can be expected that it will be greatly applicable to future digital communication methods such as synchronization, signal conversion circuits and the like. However, the previous DSP digital phase-locked loop simply replaced analog PLL work