锁相环技术在变速率PDH传输中的应用

Application of phase locked loop technique in variable data rate PDH transmission

采用了基于统计预测的时钟锁相环技术,介绍了该技术的设计方案和实现原理,通过FIFO的满空程度控制电荷泵输出相应的电平信号,利用该电平信号控制VCXO的输出时钟,使接收端恢复的时钟频率与数据保持同步,且抖动小。

The paper uses the phase locked loop technique based on statistical prediction, introduces the de- sign scheme and implementation principle of the technology, through the full degree of FIFO to control the charge pump output corresponding level signal, the signal is made use of controlling the output of the VCXO clock, to restore the receiver clock frequency and data in sync, and the jitter is small.