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I have a large circuit involving feedback as follows

enter image description here

enter image description here

I am trying to find the closed-loop gain of this. Before I can do that, I need to find the open-loop gain. Thus, removing the feedback loop, M2 becomes useless and I am left with a common-gate stage below

enter image description here

Now, I need to find the gain of this circuit Vout/Iin and I make the following small-signal model enter image description here

I can't seem to get Vout/Iin from this. Any ideas?

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Gain will be [Rd || (R1 + R2) || outputSlopeOfDrain] * deltaIin.

To compute the outputSlopeOfDrain, you need the lambda effect in the FET model.

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