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CMRR AND PSRR for a fully differential OTA

hanen88

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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
 

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arthorios

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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

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

1624567796836.png


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.
 

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