一种全数字时钟数据恢复电路的设计与实现，提出一种改进型超前滞后锁相环法的全数字时钟恢复算法，与同类电路比较，具有数据码率捕获范围宽、捕获时间短的优点。-Clock Date Recovery(CDR)circuit is a important part of data transmission equipment．For the burst data transmission，the traditional phase—lock loop can hardly achieve the re