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question about pll bandwidth

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circuitrookie

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I have came across two different definition of PLL BW in different literature.

One defines BW ~ Icp*Kv*R/N while other define it to be IcpK/(NC)

I know wn = root (IcpK/(NC)) and BW is about 2.5wn but I don't see how R and C can be used interchangeably. The only relation between them is that together they define the zero freq. which one of the definition is correct?

Thanks.
 

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