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pss-pac run in spectre for PSRR : problem

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agaurav

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spectre pac

I am trying to get supply rejection performance of an autonomous circuit using pss-pac.
What is most surprising is that is gives large values such as 70dB at 1KHz and it doesn't go below 0dB till even 1MHz.
If somebody ahs experienced this and have got the solution, please help me. Is there something wrong with the approach?
 

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