quick way to get Thevenin voltage

Discussion in 'Homework Help' started by screen1988, Mar 20, 2013.

  1. screen1988

    Thread Starter Member

    Mar 7, 2013
    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?