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Admittance parameters and input impedance

  1. Dec 5, 2005 #1

    hello this is the problem i am working on. i started out by using the admittance parameter equation

    i1 = y11*v1 + y12*v2
    i2 = y21*v1 + y22*v2

    so i1 is 20/50 by ohms law. so i1 = 0.4 so by the first equation i get v2 = 32 V.
    also plugging in values for the second equation i get i2 = 0.2 A.
    finally i got V0 by -I2*50ohms to get -10V.

    the second part about the input impedance is where i run into trouble because of the dependent source.
  2. jcsd
  3. Dec 9, 2005 #2


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    You did it wrong. The current through Vo is I2 + 0.2*V1.
    The input impedance is Zi = V1/I1.
    I did not make the other calculations but I think they are wrong. For instance, where did you get I1 = 20/50?
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