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a favorite rail-to-rail, uncompensated op-amp

Discussion in 'Electronic Design' started by [email protected], Apr 2, 2007.

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  1. Guest


    I'm looking for a rail-to-rail op-amp with compensation pins that can
    be used to set the gain bandwidth product, the catch is that it needs
    to be rail-to-rail output. I have been scouring manufacturers listings
    but I can't seem to come up with anything. I suppose that I could use
    the CA3130 but I would obviously prefer a modern replacement.

    I would be quite grateful if someone could point me in the right

    PS: Just to head off well-intending readers. Yes, I'm sure that I
    want to adjust the GBP rather than stabilize the amplifier with lead
    or lag-lead compensation. I'm running the op-amp in a peculiar
    configuration where this form of compensation should work well.
  2. D from BC

    D from BC Guest

    Can you list all the manufactures you've looked at so far?
    D from BC
  3. Guest

    So far I've tried searching through the website of the following
    Analog Devices, Linear, TI, Intersil, and National

    This is not to say that I am certain that none of these vendors supply
    an op-amp that would work for me, just that I wasn't able to find one
    digging through their website. None of these vendors appear to
    provide a "compensation pin" in their parametric search either as a
    parameter or in the features column, so I had to look up each amp that
    looked like it might (I assumed, perhaps incorrectly, that the
    minimum stable gain of such an op-amp would be greater than one).

    I think that it is more a matter of me not being able to perform an
    effective search than an op-amp with these qualities actually being
    particularly rare. I just don't have a good way of wading through the
    hundreds of rail-to-rail op-amps that are produced for those that
    offer a compensation pin.

  4. Guest

    How much gbw product are you looking for. I think most faster amps
    are going to be single stage amps due to the parasitics associated
    with running a compensation node outside the package. rail to rail
    amps typcially have gain in the output devices, so that also needs to
    be compensated...which complicates things. If you can get away
    without rail to rail i'd recommend the ad8099, ad8021 or ad829...

  5. sTeeVee

    sTeeVee Guest

    You might want to check Burr Brown. Also, there are some discrete
    operational amplifier modules that may allow you to tweek for some
    very specific specs e.g. - full rail output. Good luck.
    -Steve Greene
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