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Homework Help: Sketch the relationship of a VCVS amplifier

  1. Mar 6, 2013 #1
    1. The problem statement, all variables and given/known data

    "Sketch the V_o vs V_i relationship for a voltage controlled voltage source amplifier"

    2. Relevant equations

    none really

    3. The attempt at a solution

    Ok, so I understand and know by heart the ideal and the practical relationships for a (respectively) ideal and practical Opamp.

    Here is an Ideal Opamp relationship

    If it were practical, the "corners" of the graph would be curved (and from what I understand the opamps we have these days get those corners pretty darn close to ideal)

    So, the question is, if I were to have a VCVS (voltage controlled voltage source), rather than just simply V_o and V_i, would I in place have +/- V_s = μV_x? I know its a pretty simple question, but I can't seem to find anything to help [my teacher has mentioned controlled sources in class, but never used them in examples so I don't really understand how the heck to use them)
  2. jcsd
  3. Mar 6, 2013 #2


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    Staff: Mentor

    First, on your figure, I'd move the Vi and Vo symbols closer to the axes that they should be marking (the +x and +y axes respectively).

    And on your question, you have the figure right but I don't quite understand your red equation. What are Vx and Vs? The more traditional way to label a VCVS is shown on the right of the figure below. You can still use Vi and Vo for the labels of your VCVS terminals...


  4. Mar 6, 2013 #3
    +/- V_s = μV_x

    plus or minus of the Voltage source = multiplier for the controlled voltage source (voltage source represent by V of x).

    That is how my book represents it.
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