What is this op-amp configuration?

Discussion in 'Homework Help' started by ECE101, Mar 27, 2012.

  1. ECE101

    Thread Starter New Member

    Nov 25, 2011
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    Just wondering if someone could describe the function of the circuit below?


    [​IMG]

    Is it some form of Inductance gyrator?
     
    Last edited: Mar 27, 2012
  2. bountyhunter

    Well-Known Member

    Sep 7, 2009
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  3. ECE101

    Thread Starter New Member

    Nov 25, 2011
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    The input is the non inverting input.

    I don't think it's a schmitt trigger?

    It has negative feedback and also low pass filtered positive feedback?
     
  4. studiot

    AAC Fanatic!

    Nov 9, 2007
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    Looks like some kind of filter to me.

    Are you sure you have drawn it correctly?

    If you had the inputs swopped it would be a classic low pass filter.

    With a few extra components it could be a Sallen and Key filter.

    Why are there two series 10k resistors in the negative feedback loop with no other connections?
     
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  5. #12

    Expert

    Nov 30, 2010
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    Without "R Ground" included, it does not have negative feed back, just a 10k input load and a 10k output load. If R Ground existed, it would have a negative feedback path.

    I have to say the drawing is incomplete. The 10 uf capacitor reminds me of an integrator, and the 10k in positive feedback reminds me of hysteresis (as in Schmidt trigger) but without an input resistor the results can't be calculated.

    It is simply an incomplete circuit.
     
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  6. ECE101

    Thread Starter New Member

    Nov 25, 2011
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    hmmm well if the inputs were swapped:


    [​IMG]

    it would be a low pass filter, but what would be the purpose of the 2 resistors in the non inverting feedback loop?
     
    Last edited: Mar 27, 2012
  7. bountyhunter

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    not really

    The signal input is the inverting input.
     
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  8. ECE101

    Thread Starter New Member

    Nov 25, 2011
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    Ah yes good point, but still what would be the purpose of the 2 resistors connected between the output, ground and non inverting input?
     
  9. studiot

    AAC Fanatic!

    Nov 9, 2007
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    This is in the homework section.

    Is this homework and if so can you scan the original question?

    We are still working in the dark here.
     
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