Hello.
I'd like to ask several questions please about this circuit.
1. We are dealing here with large-signal analysis.
What is the DC input resistance of an Op-amp?
If the Op-amp is MOSFET-based, then its infinity, but what if its BJT-based?
2.
Is the DC input resistance of an Op-amp depends on the DC inputs VI- and VI+?
(Its known that the small-signal input resistance depends on the DC inputs).
3.
If I connect a resistor in the feedback loop, would VO be still equal to VI-? (Since the Op-amp sources no current because there is no load connected at the output terminal).
Thank you.