Hello everyone,
Before making this thread i went to following thread
http://www.designers-guide.org/Forum/YaBB.pl?num=1073321544so by definition CMRR= Adm/Acm
PSRR = Aps/Adm
To simulate FD OTA((with CMFB inside)) I followed the famous Ken Kundert paper to make test bench (
http://www.designers-guide.org/analysis/diff.pdf) f. The feedback network is capacitive so I put resistance of 1G in feedback path to provide the DC bias. To simulate the transfer function ( like Aps, Acm, Adm) with XF analysis, small ac signal is put in every input port. For example, common mode input signal is V4 is given 4.5 of dc signal along with 100uV of ac magnitude, same is done with power supply, V2 is given 9 V of Dc voltage along with 100uV of ac signal.
After setting this test bench the XF SIMULATION is run along with DC simulation. But I have found some unexpected results which I am not able to understand. You can see the results in below comments.
So Please explain me what is wrong(or I am analyzing it wrong) with the testbench/simulation. Kindly let me know if you need more information