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Testing open loop gain of fully differential CMOS op amp

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alfredop

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Does anyone know how to test (not simulate) the open loop gain of a fully differential CMOS op amp?
 

give a known -ve feedback of say β .

O/p= I/P * A /(1+AB). give ip so that op doesnt saturate

only A is unknown u will get that thru the above eq.

Added after 1 minutes:

i assumed common mode gain is negligible . again if u want to find that do the normal case by applying a common mode signal to both the terminals and measure the op.
 

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