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PLL 3dB Bandwidth and simple AC Linear Model for simulation

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mischivis

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What is the formula for the 3dB bandwidth of a PLL in terms of the Natural frequency and damping???
All the formulas I see online are giving me one answer, but when I create a simple linear AC test
bench in Cadence and do an AC simulation, I am getting a different answer. Can somebody look at
this test bench and tell me if I am doing something wrong? Kvco=310MHz/V, Icp=30uA, N=200, and
desired bandwidth I want is 300 KHz.

 

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