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.
模拟电路的性能难以满足需要，例如，在支路时钟恢复电路中，模拟锁相环难以满足噪声抑制要求；
The performance of the analog circuit is difficult to satisfy the need, such as the analog pll can't satisfy the requirement of noise restrain in digital clock extracting circuit.
本文给出了一种采用自偏置技术的低抖动延迟锁相环，可应用于高频时钟产生电路。
In this paper, a low-jitter process-independent DLL(delay locked loop) based on self-biased techniques is presented.
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