slew rate..

Discussion in 'The Projects Forum' started by andre1434, Jul 24, 2013.

  1. andre1434

    Thread Starter New Member

    Jul 24, 2013
    1
    0
    I'm trying to make a narrow bandpass filter for my transceiver. I was wondering if can an op amp with a slew rate of 16V/μs be used for a frequency at around 90 MHz?
     
  2. BobTPH

    Active Member

    Jun 5, 2013
    782
    114
    Do the math.

    at 16V / uSec your opamp could change only by 16 / 90 / 2 V in a half cycle, or 88mV.

    Bob
     
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  3. crutschow

    Expert

    Mar 14, 2008
    13,016
    3,235
    Chances are an op amp with a slew rate of only 16V/μs also has a gain-bandwidth too low to provide any significant gain at 90MHz as required by an active filter at that frequency. Generally active filters are not used at those frequencies because of the very high bandwidth required by the amplifiers.
     
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