CMRR AND PSRR for a fully differential OTA

[hanen88]

Hello

I am trying to simulate CMRR and PSRR in ADS of a differential OTA. However, ican't obtain good results as you can see below:
I'm so grateful if you can help me to abtain wrong results by giving me a tutorial how to simulate the CMRR and PSRR in ADS

 

[arthorios]

Your plot doesn't say anything. Show opamp schematics, CMRR/PSRR testbenches etc. A quick and effortless google/edaboard search can give you the right testbenches for both specs.

 

[danadakk]

Here is a simple way of doing PSRR. Here V2 has a 1 V sine riding on its 10Vdc.

Of course you can do the - supply pin as well, same method.

CMRR - https://www.analog.com/media/en/training-seminars/tutorials/MT-042.pdf


Regards, Dana.

 

[danadakk]

Here is a CMR vs Freq sim -

Regards, Dana.