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How to simulation PLL loop filter noise by cadence spectre

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cwcgo

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Dear all,

How to simulate PLL loop filter noise by cadence spectre?
I used 3ord LPF in PLL.
As attached figure, dashed lines are resistors noise in LPF and solid lines are output noise after transfer function.
Who can help me about LPF noise simulation by cadence spectre.
thank you very much.
LPFnoise.png
 

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