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For manual calculation, it can be done similar to small-signal AC analysis.
The difference is the input AC voltage is added to supply. The output is the current output.
The way Output responds to the supply variation. for this AC simulation required where input ac source given at VDD and vary the freq of the AC source and measure the output current .
and plot will be in dB log plot. and you can measure PSRR at different freq.
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