1.8V current mirror OTA

*Notice in two stage, V3 is postive terminal while V2 is negative, because if you apply positive to V2 negative to V3, single stage has positive gain, so second stage gives negative gain. notice we know first stage gain is 18761, second stage gain is 10000, so total gain = Av1*Av2 if you just take the voltage at single stage output, then you can still get 18761