Tlaloc
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Posts: 81
Dallas, TX
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I tried to verify it using a tran analysis. The circuit is a swcap integrator. PXF reported the common mode rejection from the CM input to the differential output as 80dB at DC (really 0.1Hz). With a 1V change, then, I should see a differential output shift of 100uV. I ran three different trans, all with the other sources zeroed out and the common mode voltage at 0V, 1.8V, and 3.6V. Based off of the PXF I would expect the differences in the outputs to be hundreds of uV's, but they were identical to 500nV. These two results don't seem to match, but I don't know how to resolve the discrepancy.
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