vborich
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Some simulators, especially the microwave-centric ones, do not offer classical AC analysis. I've never used Nexxim, but I am aware of others that don't.
You can compute all the quantities you need from multi-port matrix parameters, either directly or as functions of the matrix elements.
For example, the open-circuit voltage gain of your opamp is an element of the ABCD a.k.a chain matrix, if Nexxim lets you compute it.
Except for the S-parameters, most other network descriptions are port impedance-independent, so it really doesn't matter what you specify.
Vuk
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