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. Can anyone help me ?Thank you very much
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.