OTA as integrator

  1. Hi
    What kinds of OTA integrators are available and how should i decide which to use?
    Thanks
    Salil
     
  2. jcsd
  3. Baluncore

    Baluncore 3,017
    Science Advisor

    What are you trying to integrate?
    Why do you need to use an OTA?
    How will you trigger a reset?
     
  4. I am integrating the Analog signal for a dual slope ADC. But since the input is a large signal won't the gm vary with the input level?
    Thanks
    Salil
     
  5. Baluncore

    Baluncore 3,017
    Science Advisor

  6. analogdesign

    analogdesign 798
    Science Advisor

    I'm not sure you can buy OTAs off-the-shelf... I think they are only useful as internal components in an IC. The problem with an OTA is while you can implement simpler integrators with them in theory, they can't drive resistive loads and are therefore less interesting in practice.
     
  7. analogdesign

    analogdesign 798
    Science Advisor

    Yes. That's way people usually use op amps for this type of thing. See Baluncore's post. You want to use a Miller Integrator.
     
  8. Baluncore

    Baluncore 3,017
    Science Advisor

    Look at
    LM13600, LM13700, CA3080, CA3280, LM3080, CA3094, LT3469,
    OPA460, OPA461, OPA660, OPA661, OPA860, OPA861, OPA2662
    NE5517, MAX435, MAX436, NT996,
     
    Last edited: Sep 19, 2013
  9. analogdesign

    analogdesign 798
    Science Advisor

    Well I certainly stand corrected!
     
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