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Find Amplifier Output

Agonche

Aug 23, 2012
3
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Aug 23, 2012
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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:

R9AWfVN.jpg
 

Laplace

Apr 4, 2010
1,252
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Apr 4, 2010
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1,252
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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Agonche

Aug 23, 2012
3
Joined
Aug 23, 2012
Messages
3
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.
 

Laplace

Apr 4, 2010
1,252
Joined
Apr 4, 2010
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1,252
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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