I'm trying to figure out the output impedance of this op Amp circuit and I keep getting infinity. I'm not sure if the steps I'm doing are wrong. The reason I ignore everything besides the voltage divider is because those are the only currents I need to find ix. The problem is that I'm finishing ix to be zero. Any ideas of where I'm going wrong?
Answer
FWIW,an ideal Zout of an Op Amp is 0 and gain=∞
A practical Op Amp is around 300 Ω if open loop and when closed loop Zout is reduced by dividing the open loop gain then multiply by closed loop gain. So it is very low until it saturates internally.
then Z6 is just R3//R4 since Vout is same impedance as ground.
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