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Question about pnoise of Charge-pump

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wany

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I have designd a charge pump of PLL. And I simulated pnoise of Spectre of Cadence. The result of charge pump output noise is larger than 100pA at 1KHz. I don't know what is reason about this? Below is my cirucit and simulation result. :cry: Can anyone help me ?Thank you very much
 

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Doesn't the noise analysis list the contribution of individual noise sources?. But it looks like ordinary MOSFET 1/f noise.
 
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    wany

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I checked the noise contribution as you say the ordinary is 1/f noise. When i enlarge my mos size 1/f noise can be decrease . But it is still large . How to decrease MOS 1/f except enlarge the MOS size. Thank you
 

I checked the noise contribution as you say the ordinary is 1/f noise. When i enlarge my mos size 1/f noise can be decrease . But it is still large . How to decrease MOS 1/f except enlarge the MOS size. Thank you

you can check the noise contributors list.
The ways to decrease noise , use faster mos for better switching speed, reduce current source noise ( trade off). take balanced structure to avoid switching low noise sources, which are inherently slow.
 

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