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simulation of chopper stabilized amp, help!!

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iamxo

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I use pss+pnoise to simulate the noise of the whole system.

since the noise is considered as behind the first modulator that is before the amplifier, but the signal is added to the input of the first modulator.

so I want to ask, the noise simulation result in the input is the correct value of the system?

I am confused because when I set as above, the result (hudred uV noise level) is very different from I expected (tens nV noise level).

so, can anyone help me? thanks very much.
 

I am sorry, my circuit is large.

so I just upload the circuit structure which is also useful to explain.

[/img]

Added after 13 minutes:



again!!

Added after 15 minutes:

in the picture, the noise is at the input of the amplifier.

but in the pss + pnoise simulation, the noise is at the whole system input. so is this inconsistent?

or should I remove the first modulator to simulation the input noise?

thank you!
 

I have a similar question.

After simulating a chop amp, it seems like looking at the input referred noise, the 1/f noise is moved to the modulation freq (clk freq), but at the output referred noise, I still see 1/f noise. The input referred noise does not look the same at the output referred noise.

Have I interpreted something wrong here?

Thanks.
 

Hi would you mind giving me some simple steps on how to use pss and pnoise simulation for a chopper amplifier? since Im quite lost and at our school we dont have tutorials or cadence help..thank you very much and goodluck for your designs!
 

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