quick way to get Thevenin voltage

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screen1988

Joined Mar 7, 2013
310
Please see my attached file.
This is a text from my textbook:
To calculate \(V_{Y}\), we note that M1 drivers M2 as a source follower and replace \(V_{in1}\) and M1 by a Thevenin equivalent: the Thevenin voltage \(V_{in1}= V_{T}\) the resistance \(R_{T}=\dfrac {1} {g_{m1}}\).

I see that the book mention this problem is very simple and the solution to get Thevenin voltage and resistance aren't given.
I had to draw two small signal models of M1 and M2 to figure out the value of Thevenin voltage and resistance.
Therefore, I think you, experts, do you have any quick way to get the Thevenin voltage and resistance? Or you also have to draw small signal model as I did?
 

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