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关于CD74HC4046A的环路滤波的参数Fc问题

Other Parts Discussed in Thread: CD74HC4046A

我在使用的CD74HC4046A的时候,看到Datasheet总有一个关系式:

A small capture range (2fc) is obtained if τ > 2fc ≈ 1/π (2πfL/τ.)1/2,

这个是在第20页的,Figure 46中出现的,一直没看懂,这三个之间的关系,

有没有人帮忙解释一下,坐等,谢谢