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Programmable Gain Amplifier

Discussion in 'Electronic Design' started by Shreyas Kulkarni, Dec 22, 2004.

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  1. can somebody suggest me a low noise, faily low cost, programmable gain
    wideband amplifier with bandwidth>=20MHz, gain varying from 1 to at
    least 10 and with high CMRR?

    any further links/tips/approaches will be highly appreciated.
    Shreyas Kulkarni
  2. Frank Miles

    Frank Miles Guest

    Burr-Brown (oops, TI) has some nice digitally programmable instrumentation
    amplifiers, but not with that kind of bandwidth. You haven't spec'd the
    gain accuracy, input bias current, nor what constitutes "low noise".
    There are additional choices if you supply your own analog switches
    in tandem with the amplifier, many more if you supply the gain-setting
    resistors though getting flat frequency response may require some care.
    Maybe you provide more detailed specs, or at least what you might be
    willing to trade off?

  3. Jim Thompson

    Jim Thompson Guest

    The programmable gain (in 0.25dB steps) that I mentioned in another
    thread (GPS/cell-phones) works at 1GHz ;-)

    ...Jim Thompson
  4. Joerg

    Joerg Guest

    Hi Frank,
    Then there is the AD603 which is quite decent in cost, a few Dollars, if
    that's in the budget. But my all time personal favorite is the old yet
    still somewhat popular uA733. At under 40 Cents it is a steal. This one
    needs to be treated differentially and gain control is not dB-linear but
    at that price I always gladly took that in strides.

    Regards, Joerg
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