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instrumentation amplifier and anti-aliasing

Discussion in 'General Electronics' started by Ponkan, Jul 23, 2003.

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  1. Ponkan

    Ponkan Guest


    I was wondering if I could "integrate" easily a low-pass filter (for
    ADC anti-aliasing purpose) in an instrumentation amplifier.
    I would not want to include an active filter between the
    instrumentation amplifier (the ADC buffer) and the ADC itself. Just
    wanted to use to the instrumentation amplifier to do the job. Any
    idea? For the instrumentation amplifier I was thinking of the
    Burr-Brown INA128 and for the ADC the Burr-Brown ADS7813. The ADC can
    work at up to 40kHz and I would like to limit the input bandwidth to
    10kHz. Maybe a simple RC between them is enough... I would like to see
    your points of view.
  2. Robert Baer

    Robert Baer Guest

    I would think that a simple RC filter from opamp to ADC would be
    adequate, provided you do not mind the rolloff in the desired signal as
    well as the phase delays.
    Setting the 3dB point at or below the sampling rate will erasonably
    reduce the sampled signal level above the sampling rate; combined with
    the reduced sampling sensitivity, the attenuation may be more than
    adequate if you are not fussy.
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