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Find Amplifier Output

Discussion in 'Electronics Homework Help' started by Agonche, Jun 18, 2013.

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  1. Agonche

    Agonche

    3
    0
    Aug 23, 2012
    Hello there.
    I am preparing for an exam and solving random problems.
    I'm not sure if I solved this one correctly so I just need a confirmation.

    Find the output expression:

    [​IMG]
     
  2. Laplace

    Laplace

    1,252
    184
    Apr 4, 2010
    My solution for Vout is the same as yours. However, I do not understand your method. My method is to realize that the voltage difference between the op-amp inputs must be zero.
     

    Attached Files:

  3. Agonche

    Agonche

    3
    0
    Aug 23, 2012
    OK, so the solution seems to be right.

    First I simplified the circuit (found Ve and Re).
    Then using Kirchhoff's laws I wrote equations for I1 and I2.
    I2=I1, and then just solve Vo.

    Thanks.
     
  4. Laplace

    Laplace

    1,252
    184
    Apr 4, 2010
    At first I did not understand why you calculated Re since it is not relevant to the solution. But now I can see you don't use Re anywhere in your solution.

    Then I did not understand the marked paths labeled with circled '1' and '2' going from Vin1 to GND and from Vout to GND. That is still a mystery.
     
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