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Without negative feedback the finite offset voltage - together with the very large open-loop gain of the opamp - will drive the output into saturation, thus disabling any small-signal gain measurement.
Fot this reason we provide dc feedback (which drastically reduces the dc gain) but in addition we use a capacitor for shorting the feedback signal for rising frequencies.
As a consequence, we cannot directly measure or simulate the gain at DC - however, if the capacitor is large enough the signal feedback (ac) is not effective for frequencies below the open-loop cut-off frequency.
Hence, we can extrapolate the gain down to dc.
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