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Discussion in 'Electronic Basics' started by Joshua Michael Huffman, May 13, 2005.

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  1. Hi, i have a voltage controlled current source that is being short
    circuited. What happens if the controlling voltage is not zero?

    R1 a R2 c
    | | | |
    + \ / \ \ |
    V1 / R3,Vab /gVab\ / R4 |
    - \ \ / \ |
    | \ / | |
    | | | |
    b d

    Here is a rough picture... I'm trying to find the h parameters of this
    circuit, in particular "h21" where (c,d) is shorted out... In case you
    want to know....

    R1 = 100 ohm
    R2 = 10e6 ohm
    R3 = 2.5e3 ohm
    R4 = 100e3 ohm
    g = 40 mA/V

    Here are the ans. straight from my book.

    H11 = 2.6e3 ohm
    H12 == 2.5e-4
    H21 = 100
    H22 = 2e-5 conductance

    I can get the first two but i'm still working on H21 any help would be
    appreciated. I general, i dont know how the vcvs behaves when it shorted.
    Any help would be appreciated.

  2. Andrew Holme

    Andrew Holme Guest

    If you short-circuit a current source, the current flows through the short,
    and the voltage across it is zero.
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