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Help solving h-parameters

  1. Sep 9, 2014 #1
    While solving for h-parameters ..we take certain assumptions like , open circuiting input & short circuiting output..how can we see this thing practically..?? I mean..If we are ssaying that if output is shortcuited then h11=V1/I1 =input impedence with output short-circuited..if output is not short-circuited,,then will this have no relevance..??
    Please explain what does this actually means?
  2. jcsd
  3. Sep 11, 2014 #2


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    Staff: Mentor

    If output is not s/c then there are multiple elements in the model that influence the input current, as you can see in this wikipedia figure.


    But if you s/c the output, making V2 = 0, then the voltage source affecting the input becomes null, thus leaving h11 as the only influence on input current. So by measuring input current under this condition, when you apply a test voltage you can determine a value for that h11 resistance.
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