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Weren't these models changed soon after AD took over?

It seems as if whoever designed these Universal Opamps gave no thought whatsoever to a common-mode input impedance.? Not one of them has a parameter for that.

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If you ground either input pin and measure the impedance between the input pins, you get what appears to be an impedance between the pins of Rin, so you can fool yourself by doing that.

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I assumed it was Mike Engelhardt who made these models.? I am guessing he just overlooked this.

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Andy

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