Dear All:
            I want to get your opinions about the correctness of  CMRR simulation methodology of a single-ended OPAMP (described below). I attach a figure for the bench I am using .

         Here, vout/vcm=Ac/(1+Av-Ac/2)
         (Ac=common mode gain, Av= diff-mode gain)
In ADE I use stb analysis to get Av (Av = loop gain in stb) and use XF/AC to get vout/vcm (same bench). Thus I know Ac and hence the CMRR.

I have doubt about the method as Ac is coming out to be quite large (even more than Av). Av is correct as I can verify the Av value from different bench (only stb analysis).

Please comment.