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A quesion about PSRR of OPAMP

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holddreams

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When plot the PSRR+, the phase plot will decreases from 0 some negative degree,

So, if the phase plot decreases from about -180 degree, How to explain this?

Thanks.
 

saber_haijun

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I think, the reason is that you place the input ac voltage source on no-invert input of opamp to get phase decrease from 0.
you can get phase decrease from 180/-180 if you place the input ac voltage source on invert input of opamp.

Added after 8 minutes:

Sorry, what I say is for the case that ac source is placed input of opamp.
The question what you say maybe the same reason. It is only because ac source direction.
I suggest you release in analog ic design board. There are many experienced people who work in analog area.
 

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