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How to draw the PSRR curve for a opamp in COSMOSSCOPE?

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holddreams

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How to draw the PSRR curve for a opamp in COSMOSSCOPE?
When use hspice ,the output vdb(out) is 1/PSRR,
so how can i get the psrr?
 

some books define vdb(vo/vdd) as psrr
but others define vdb(vdd/vo) as psrr
the only difference of psrr in db format is the sign
so you can just plot vdb(vout) or -vdb(vout) as you like
 

You can refer the book "CMOS analog circuit design" by P.E.Allen, there are some examples explain this problem.
 

you can depict 1/PSRR in dB mode. Then you can easily image the PSRR picture.
 

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