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Noise Simulation of Chopper Amplifier using PSS & Pnoise

jdp721

Hi.

I am trying to simulate a simple chopper stabilized op-amp in Cadence Virtuoso (PSS + Pnoise analyses), and seeing the output noise spectrum. So, it is expected that the chopping and anti-chopping will translate the 1/f-noise spectrum (of the op-amp) to the chopping freq.

PROBLEM: although the flicker noise gets shifted to the chopper freq (1 kHz), but, some Flicker-like noise seems to be present at baseband after anti-chopping (instead of being constant there).

Is the o/p noise data okay? (I am asking this also because I have seen similar data in few references without any explanation as such)

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