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High Bandwidth Digital Pot

Discussion in 'Electronic Design' started by [email protected], Jan 22, 2008.

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  1. Guest

    Hi. ANyone knows about a digitally controlable potentiometer that has
    a wide bandwidth. It's for a portable-scope project so I would need a
    bandwidth something like 20MHz minimum. Do anyone knows if its a good
    idea to use the digital pot in the feedback loop of a inverting-amp
    (op-amp).
    Will my signal still be clean.
    Well thanks
     
  2. Take a common 100 Ohm potentiometer and attach a step motor to it.
    Bad idea. Digital pot is RC-RC-RC-RC.... Stability and response will be
    problematic and varying with gain.
    The design of the scope front end amps is not trivial and requires a
    great deal of experience.


    Vladimir Vassilevsky
    DSP and Mixed Signal Design Consultant
    http://www.abvolt.com
     
  3. Maybe these guys have something you could use.

    http://www.analog.com/en/subCat/0,2879,759%5F787%5F0%5F%5F0%5F,00.html

    I used the AD603 10 years ago and it did everything AD said it would

    GG
     
  4. Guest

    These pieces seem quite interesting. But since it's a portable scope,
    I only use 3.3v powered devices and many of this amps require 5 or
    12v. So I'm thinking about an analog multiplexer that could handle
    wide bandwidths and a set of non-ajustable amps. Still, if someone has
    another idea please tell me.
    Thanks
    Joey Caron
     
  5. Use a programmable gain broadband amplifier.
     
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