...术（铜线）或单光缆技术，时钟信号 不用单独的线路传送，因此一项新的技术应运而生，即数据时钟恢复（Clock and Data ReCovery，CDR）技术。 CDR技术是从数据跳变信息中抽取出同步的时钟。
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可以预计，只要在器件上作某些更换，亦可制成工作速率更高的时钟数据恢复模块。
It is estimated that a data and clock recovery module with a higher operating rate is available only if some devices are changed.
与传统并行数据恢复电路相比，该电路不需要本地参考时钟，并且恢复出的并行数据是位同步的。
Compared with conventional circuits, the recovered parallel data is bit-synchronous, and the reference clock is avoided.
设计了一个数字时钟数据恢复电路，采用相位选择锁相环进行相位调整，在不影响系统噪声性能的前提下大大降低了芯片面积。
A phase selection PLL is adopted to adjust the phase of the recovered clock, and the chip area of the recovery circuit is greatly reduced without sacrificing the noise performance of the system.
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