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What does this opamp configuration do?

  1. May 31, 2013 #1

    dla

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    1. The problem statement, all variables and given/known data
    Trying to figure out what this opamp does but can't pinpoint it.


    2. Relevant equations



    3. The attempt at a solution
    The one with the capacitor looks like an integrator. I attempted to build this circuit to see what it does. At node B I saw a triangle repeating waveform, node A gives a square oscillating waveform and C is some sort of horizontally flipped RC curve which can been seen with the file I attached. Anyone have any idea the name of this circuit?
     

    Attached Files:

    Last edited: May 31, 2013
  2. jcsd
  3. May 31, 2013 #2

    CWatters

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    Hint: The word you are looking for begins with an "O" and is used to describe a family of systems including a pendulum.
     
  4. May 31, 2013 #3

    dla

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    I'm still quite not sure.. The only thing that comes to mind is an oscillator?
     
  5. May 31, 2013 #4

    CWatters

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    Oscillator will do :-)

    I suppose "Triangle Wave Oscillator" or "Hysteretic Oscillator" or "Relaxation Oscillator" might get you another half mark.

    The right hand op-amp is indeed an inverting integrator. It integrates the "constant" output of the left hand op-amp.

    The left hand op-amp is configured as a comparator (with hysteresis) and it's output is a "constant" VCC or -VCC.

    You can actually make one by merging the functions each op-amp performs into one op-amp. See wikipedia for that..

    http://en.wikipedia.org/wiki/Relaxa...2.80.93based_electronic_relaxation_oscillator
     
  6. Jun 1, 2013 #5

    dla

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    Perfect explanation, thank you!
     
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