This paper discusses an all digital phase-locked loop with a zero-crossing detector and a loop filter.

本文讨论的全数字锁相环包括过零检测器和环路滤波器。

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The function of a loop filter is to filter high-frequency signal out of the output voltage from PFD and CP, thus the output signal from VCO will be purified.

环路滤波器的作用就是滤除从PFD&CP出来的电压中的高频成分，从而纯化VCO的输出信号。

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The loop is a second order phase lock loop, consisting of an interpolator, a timing error detector and a loop filter.

环路为反馈结构，包括插值器、时钟误差检测和环路滤波器三个部分。

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The loop is a second order phase lock loop, consisting of an interpolator, a timing error detector and a loop filter.

环路为反馈结构，包括插值器、时钟误差检测和环路滤波器三个部分。

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