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How to simulate (equivalent) noise (charge) of CSA?

delgsy

Hello,
I have done this simulation previously when I had only the CSA.
Back then, I used noise analysis, found the output-referred noise voltage, integrated it, and then divided it with the Cf.

Now I have another block after this CSA and would like to include the noise of this circuit and referred the noise to the input.
Conceptually, it is similar like the method I used previously but now I need to divide the output-referred noise voltage with the transfer function of this block.
Is there a simple way to do this?
I prefer to use single testbench to simplify everything.

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