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Non ideal opamp

  • Thread starter bnosam
  • Start date
  • #1
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Homework Statement


http://i62.tinypic.com/2n00efo.jpg

Homework Equations




The Attempt at a Solution


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I drew the circuit here:
http://i57.tinypic.com/10rmp20.jpg
I'm not sure where to start with this problem.



Edit: Sorry for using this site for help so much, I just have midterms coming up soon and need to get practise problems solved and I don't have money for a tutor.
 
Last edited:

Answers and Replies

  • #2
LvW
793
213
My recommendation: Start with your handwritten drawing and apply the existing basic rules for analyzing a network that contains two voltage sources: Superposition.
This procedure will lead you to the correct result.
Finally, you can check your result by setting (a) the open-loop gain to infinite, (b) the input resistance to infinite and (c) the output resistance to zero.
Then, you must arriove at a simple expression that is known from the theory of IDEAL opamp applications.
 
  • #3
rude man
Homework Helper
Insights Author
Gold Member
7,627
714
Hint:
Redraw the circuit with input and output impedances OUTSIDE the op amp. Give the op amp itself a gain of 300,000.
If you do this right you will wind up with three nodes: vn, vo and vg plus of course the input voltage. vo is the op amp output voltage which will differ from vg since there will be a drop across the 5K output impedance.
Use standard KVL or sum of currents = 0.
 

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