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Find the Y-parameters for the following two-port circuit

  1. Nov 26, 2013 #1
    1. The problem statement, all variables and given/known data
    Find the Y-parameters for the following two-port circuit

    2. Relevant equations

    3. The attempt at a solution
    Node 1 :V1(1/3+1/4)-1/4V2=I1
    Node 2 : -1/4V1 + V2(1/4+1/5)-1/5(2I1)=I2

    Subtitute I1 from the first equation to second equation, we have :

    So y11=7/12, y12=-1/4, y21=-29/60, y22=11/20

    But the solution gives me that y12=1/4 and y21=29/60, there are differences of signs. I haven't found my mistake.
  2. jcsd
  3. Nov 26, 2013 #2


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    Staff: Mentor

    Could be you haven't made a mistake! Your results look okay to me.
  4. Nov 26, 2013 #3

    rude man

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    Homework Helper
    Gold Member

    Your answer is correct. The "solution" is wrong.
    Last edited: Nov 26, 2013
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