# Sketch the relationship of a VCVS amplifier

1. Mar 6, 2013

### Kevin2341

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. Mar 6, 2013

### 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...

http://reference.wolfram.com/applic...LImages/CircuitElements/CircuitElements_4.gif

3. Mar 6, 2013

### Kevin2341

+/- 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.