Calculate Vout/Vin

Discussion in 'Homework Help' started by Luksch, May 14, 2013.

  1. Luksch

    Thread Starter New Member

    Apr 18, 2013
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    Hello, can please someone help me with my homework. We should calculate the closed-loop gain. So Vout/Vin. But i dont know really how i calculate Vout and Vin for this circuit. Can somebody expalin me how to calculate them?

    Thanks in advance
     
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  2. WBahn

    Moderator

    Mar 31, 2012
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    4,796
    Do you have any information about that current source? If not, just call it Io and proceed. Who knows, it may drop out.

    You need to show your best attempt to solve YOUR homework problem. Do the best you can. In particular, there are some voltages and currents that you can pick out pretty easily and some others where you can set up relationships pretty readily. Assume that the transistors are ideal having negligible base current and a Vbe of Vd.
     
  3. Luksch

    Thread Starter New Member

    Apr 18, 2013
    5
    0
    So shoul i draw a small-signal model or should i use nodal-method or kcl?
     
  4. WBahn

    Moderator

    Mar 31, 2012
    17,748
    4,796
    First work with the large signal. You need the DC bias conditions from that to do the small-signal equivalent.
     
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