question for psrr of an amp

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big2

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Hi,everyone!
I have one question of simulation for psrr of a amplifier.
usually，psrr is below 0dB,is it possible that psrr curve can be above 0dB at high freq(why?),and why it is relative with the output cap. if the output cap is high,psrr is all below 0dB, and if output cap is lower(such as 100p or 1n), psrr curve can be above 0dB.

Thank you for reply in advance!
 

At high frequencies, a phase difference can occur between the differential inputs of an amplifier, which can cause the error signal to be amplified, resulting in a PSRR of above 0 dB. An output cap will probably block the high frequency components at the output of the amplifier, which would improve the PSRR. (In my experience)
 
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    big2

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Thank you for your explanation!
 

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