PSRR of Two stage OTA-Miller

[shuratox]

Hi,

I'm designing a two-stage OTA-Miller, and now i'm simulating the specifications. My question is about the PSRR. I would like to know what is the relationship between the PSRR+ and PSRR- and what is the effect of this two in the circuit.
Because in my simulation i'm having PSRR+ = 97 dB and PSRR- = 23 dB, and i can't find a relation to explain those values.
Thanks.

 

[FvM]

What kind of "relation" you are looking for? 23 dB is inacceptable low and sugggests incorrect bias or a design error. Or a bad simulation setup. Hard to discuss without a full circuit.