I am really lost on this. The question asks to find the op amp voltage gain of the non ideal op amp pictured below. It give open loop conditions: Rin = 400kΩ Rout = 2kΩ Gain = 500k Actually the question states: Find the voltage gain (vo/vg), the voltage at the negative input terminal (vn) when the input voltage is 50 mV and the input and output resistances Which is a bit vague but I assume it's asking for the closed loop voltage gain. Also I'm assuming the open loop Rin is the op amps internal resistance between Vn and Vp? With Rout being the op amps internal output resistance between -AVin and Vout? I'm not even sure where to start. I reckon the input current is: (Vn - Vp)/Rin + (Vn-Vo)/Rf and the output current: (Vout - Vn)/Rf + (Vout + AVin)/Rout. Am I along the right lines? Or am I way off? EDIT: Also this isn't technically homework as in it won't be marked so I hope it's in the right thread.