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

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melkord

Full Member level 2
Hello,
I have done this simulation previously when I had only the CSA.
Back then, I used noise analysis in Cadence, 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 in Cadence?

Use AC analysis.

Find the transimpedance function (I -> V) from input to output : H_out(f)
Find the transimpedance function (I -> V) from input to CSA output. : H_csa(f)
Find the output-referred noise : S_out(f)

Take:

int { S_out(f) / | H_out(f) |^2 * |H_csa(f)|^2 } / Cf​

or simply find the input-referred noise S_in(f), multiply it with |H_csa(f)|^2, integrated and divide by Cf.

int { S_in(f) * |H_csa(f)|^2 } / Cf​

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