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How to measure the filter roll-off rate

  1. May 28, 2012 #1
    Hello, I have taken the attached filter response graph of filter gain to frequency created in micro-Cap. My cutoff frequency is 1kHz.
    How can I measure the roll off rate in db/Dec based on this graph ?
    Perhaps there is a formula ?
    Any help would be appreciated.
     

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  2. jcsd
  3. May 28, 2012 #2

    gneill

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    Staff: Mentor

    How many decades does your graph run for after the cutoff frequency? How many dB does it drop over those decades?
     
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