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Subject: charge amp spice sim

Date: 09/18/02 at 8:56 PM
Posted by: Alex
E-mail: apike@microsensors.com
Message Posted:

I'm trying to simulate a charge amp in Spice. The setup is a variable capacitor as Cin, and a parallel RC circuit in the feedback path of an ideal op amp. I've biased one side of the capacitor to a dc source, and the non-inverting pin of the op amp is set to ground.

I'm not getting what I'd expect, namely the ac current out of the variable capacitor is zero.

Any ideas?

TIA,
Alex


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