传统的数字锁相环系统是希望通过采用具有低通特性的环路滤波器，获得稳定的振荡控制数据由于数字电子技术的迅速发展，尤其是数字计算和信号处理技术在多媒体、自动化、仪器仪表、通讯等领域的广泛应用，用数字电路处理模拟信号的情况日益普遍。所以模拟信号数字化是信息技术的发展趋势，而数字锁相环在其中扮演着重要角色。-Conventional digital PLL system is to have a low-pass characteristics by using the loop filter to obtain a stable oscillation control data as the rapid development of digital electronic technology, especially digital computing and signal processing technology in the multimedia, automation, instrumentation , communications, the extensive application of digital circuits with analog signal processing is becoming more common. So analog signal digital information technology, trends, and digital phase locked loop in which play an important role.