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Transistor Circuit

  1. May 14, 2014 #1
    1. The problem statement, all variables and given/known data
    So I am supposed to find Vo in this circuit. Given, Vb-Ve=0.7, ic=100ib, ie=ic+ib

    3. The attempt at a solution
    In order to solve for Vout i did KVL for the two loops:

    Loop 1 (left side, clockwise):

    Vb-Ve-ie(416)+2-ib(10*103)=0
    0.7-ic(416)-ib(416)+2-ib(10*103)=0
    0.7-ib(100)(416)-ib(416)+2-ib(10*103)=0
    2.7-52016ib=0
    ib=5.19*10-5A

    ic=5.19mA
    ie=ic+ib=5.2mA
    Ve=ie(416)=2.18V (this one i am not sure)

    Loop 2 (Right side, anti-clockwise)

    10-ic(2*103)-Vo-Ve-ie(416)=0
    Subbing in everything i get
    Vo=4.7V

    But the answer is supposed to be 5 Volts, i am not sure where i made a mistake.

    xlwnqr.png
     
  2. jcsd
  3. May 14, 2014 #2

    phyzguy

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    The 2V and the 0.7V in the left hand loop are in opposite directions, so they should subtract, not add, so you should get 1.3-52016*Ib=0.
     
    Last edited: May 14, 2014
  4. May 14, 2014 #3
    I still don't get the right answer, this time around i get 7.87
     
  5. May 15, 2014 #4

    phyzguy

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    You've made another mistake in the right hand loop, but you don't really need that. With what I gave you, you should get Ib = 25μA. Ic = 100* Ib = 2.5 mA. Vout = 10.0 - 2.5mA * 2.0 kΩ = 5.0V
     
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