# Find Amplifier Output

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

1. ### 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:

2. ### 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.

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3. ### 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

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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