最小脉冲宽度20 ms。
因此，需要提供具有可控制最小脉冲宽度的相位频率检测器。
Therefore, it would be desirable to provide a phase frequency detector that has a controllable minimum pulse width.
最小脉冲宽度的变化可能不利地影响PLL的静态相位偏移和性能特征。
Changes in the minimum pulse width can adversely effect a PLL's static phase offset and performance characteristics.
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