基于CPLD实现积分型自适应调节数字锁相环

Self adapting integral DPLL based on CPLD

介绍了一种新型的数字锁相环。针对语音信号受干扰易失真的特点,设计了积分电路取代传统的微分电路进行处理,同时为了协调锁相环相位调节速度与抗干扰能力的矛盾,加入了自适应调节模块,使锁相环在具有很好的抗干扰能力的前提下,作到迅速地调节相位达到锁定状态。

A new type of DPLL is introduced in this paper. In allusion to the character of sound signal prone to be interfered and distorted, an integral circuit is designed instead of a traditional differential circuit. At the same time an adaptive module joins for the purpose of adjusting the controversy of PLL speed of phase adjustment and the ability of disturbance rejection. With the better ability of disturbance rejection, PLL can adjust the phase rapidly to achieve the locked state.