Simulating PSSR+/PSSR- and CMRR

Using an ac analysis is not the most efficient, because you need to move the ac source from the signal input to each supply in turn, and run a separate analysis for each power supply rejection ratio. If you run xf analysis, then you tell it where the output of the circuit is, and then just point at each source to get the transfer function from each source. The expressions you give would actually be computing the transimpedance (assuming the output was a voltage) or current gain (if the output was a current) because you're getting the "DATA" from the terminal of each source. Instead I'd expect (and it's easiest to do this starting from Results->Direct Plot->Main form and then clicking on the source, with "add to outputs" selected so you can get the resulting expression into the ADE outputs) it to just refer to the source name. So something like:

db(getData("/V0" ?result "xf"))

So in your test case, that would be (assuming  you wanted it as rejection, so the inverse of gain):

-db(getData("/Vsp" ?result "xf"))
-db(getData("/Vsn" ?result "xf"))

For common-mode rejection ratio, you'd need a source defining the common mode, which you don't appear to have in this case. There are plenty of references on the internet explaining suitable test setups to measure common-mode rejection ratio for opamps. In the configuration you have there, the common mode is entirely defined by the DC level of the Vp source, so there is no common mode rejection to be calculated since you only have a single-ended input.

Andrew.

Dear Andrew,

Thank you very much indeed for clarifying the xf (transfer function analysis).

I observed some strange case though. When I use xf analysis for the PSS- I get different phase plot when comparing to the phase plot obtained through AC analysis.