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Edge Detector

Discussion in 'General Electronics Discussion' started by alfa88, Jun 8, 2011.

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  1. alfa88

    alfa88

    344
    5
    Dec 1, 2010
    Edge Detector?

    I just came back from a job interview and they had me evaluate an op amp circuit. I'm pretty sure I got it right but what do you guys think? On the input was a 2 Vp-p square wave @ 1kHz, the output a triangle wave, 6Vp-p @ 1khz. The negative slope of the output coincided with the positive going edge of the input. I described the circuit as an inverting edge detector with a gain of 3. Sorry, I failed to concentrate on the input connections: all I remember is that there were 2 other resistors. It was a sort of a 'beat the clock' situation and there were other tasks to perform. They didn't have values on the schematic and they used 1% resistors (It takes me a while to decipher those).
     

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    Last edited: Jun 8, 2011
  2. davenn

    davenn Moderator

    13,837
    1,951
    Sep 5, 2009
    mite help if we saw the circuit you are referring to :)
    resistor values etc

    Dave
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,497
    2,838
    Jan 21, 2010
    Sounds to me like an integrator.
     
  4. alfa88

    alfa88

    344
    5
    Dec 1, 2010
    Integrator: Yes

    Thx. I came up with this circuit and it behaves exactly the same. I am assuming that the impedance of the capacitance affects the gain. I looked for practical applications but it left me scratching my head. Any thoughts?
     

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    Last edited: Jun 9, 2011
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