Ken Kundert
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BackerShu, PSS followed by PAC, PXF, and PSTB are definitely the way to go. If the result are wrong it, it is probably because you are making a mistake in how you apply them. Perhaps if you describe what you are doing, we can point out the flaw.
Tyanata, In DC analysis the clocks are not operating, so the common-mode bias point is not being controlled by the common-mode feedback. As such, you DC results seem to be reasonable, but also useless. You need to focus on determining what is limiting the gain in the real circuit. Have you tried running PAC analysis on the idealized circuit? If you did and still saw 75dB of gain, it would point to the problem being in the circuit rather than the simulation.
-Ken
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