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Performing mesh analysis with current sources...

Discussion in 'Electronic Basics' started by David, Sep 21, 2007.

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  1. David

    David Guest

    Someone told me I need a positive voltage source to perform mesh analysis on
    this circuit:

    http://img260.imageshack.us/img260/4665/deletemecircuituz9.jpg

    Is this true?

    I don't see how the voltages in the outer loop can add to 0.

    I've solved this with nodal analysis but have not been able to with mesh
    analysis yet. The equations I've come up with are:

    (both currents assumed clockwise)

    i2 - i1 = Va/4
    i2 = -1

    I was thinking a Supermesh would provide the third equation I need but all I
    see from that is:

    i1*2 + i2*3 = 0 but from the PSpice analysis I know this isn't going to lead
    to a solution.

    Thanks
     
  2. David

    David Guest

    I should have mentioned that the gain of the voltage controlled current
    source is .25.

    I was able to solve the problem by using the VCCS to determine the potential
    across the constant current source. I'm not sure what rule I am using
    though.

    When creating a supermesh around the entire circuit it seems to me like the
    constant current source should be the loop current. I don't see why I
    should have thought to calculate the voltage across the current source in
    the first place...

    Here are the final equations I've used:

    i1 - i2 = Vab/4 -constraint from VCCS
    i2 = -1 -known loop current
    2(i1) - 3 = (i1 + 1)4 -supermesh
     
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