Mmm...Current sauce...

Discussion in 'Homework Help' started by Bemcma3, Sep 11, 2009.

  1. Bemcma3

    Thread Starter New Member

    Aug 14, 2009

    If I were trying to solve this circuit for Vout by simultaneous equations or gaussian elimination, which node would be best to consider as my ground? I'm getting a little confused about the effects of the current sources, can anyone explain their effect and how to consider them within the circuit?

  2. Ratch

    New Member

    Mar 20, 2007

    If I were going to solve this circuit using the single node method, then I would chose the center node for ground reference, because it connects to the most branches. But instead, on this problem, I would combine the center node with the south node into a supernode, and use the supernode method to eliminate one solution equation.

    Current sources have very profound effects on circuits, as much as voltage sources do. They are included in node and loop equations as are voltage sources and cannot be ignored. A good textbook is your friend in how to do this.

  3. AdrianN

    Active Member

    Apr 27, 2009
    This is a special circuit. Vs imposes the voltage between the central node and the negative output pin, while Is forces the current in the positive output node. As such, Vo behavior is determined only by the loop formed by Vs, upper R and Vo. The rest of the circuit is irrelevant.

    Therefore, the only two equations you need are one on that loop and another in the positive output node:

    -Vs = Ix R + Vo
    Is = -Ix + Vo/R

    2 simple equations with 2 unknowns. I will let you find Vo expression.