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Homework Help: Impedance of Parallel Dependent Sources.

  1. Nov 21, 2011 #1
    1. The problem statement, all variables and given/known data

    I have this circuit:

    Code (Text):

    U1___R C I1 I2 R C ___U2
    That's supposed to be two sets of Resistor, Capacitor, and dependent current sources all in parallel except with a capacitor separating the dependent current sources on the top wire. I need to know the impedance across U1. The U1 and U2 represent the voltage drops across the top and bottom wires. I1 = aU2 and I2 = bU1

    2. Relevant equations
    I must not know them all, otherwise I could solve it. I know Kirkoffs laws and superposition, mesh analysis, and nodal analysis (or at least I think I do, I just learned it very recently).

    When a = b and the resistors are taken out, this circuit is supposed to become the equivalent of a capacitor and inductor in parallel.

    3. The attempt at a solution

    I've tried a lot of different methods, and I either get so many terms that no sane teacher would ever expect me to have to work with them all, or I get a result that is not an equivalent circuit of an inductor if I try to do the same thing without the resistors and with a = b. There was a homework assignment before this in which a gyrator and a capacitor were used to make an equivalent inductor, but I don't think I can do the same thing thing as before because there are more nodes, although it looks a hell of a lot like a gyrator when a = b.

    I started this class a few weeks behind, it's taught in a foreign language, and I don't really have any access to homework help, so it's a damn hard class.
    Last edited by a moderator: Nov 21, 2011
  2. jcsd
  3. Nov 21, 2011 #2


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    Staff: Mentor

    It would help if you could upload a proper drawing, or at least place your ascii art within "code" tags to prevent space mashing. Code tags are "code" and "/code" within square brackets.
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