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2-pole active filter question

Discussion in 'General Electronics Discussion' started by Fovakis, Jun 30, 2013.

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  1. Fovakis

    Fovakis

    2
    0
    Jun 15, 2013
    Hello! I am desiging in PSpice a 2-pole active filter. the values are taken from a wikipedia example to be sure about the fcut.

    http://i1284.photobucket.com/albums/a578/fovos1/activefilter2polesallenkeytopology_zps30b85696.png

    this is the circuit http://en.wikipedia.org/wiki/File:Sa...ss_Example.svg

    and the fcut=16KHz. but when i am doing it in pspice the fcut is at 10khz.

    i tried with other values and again problem. i read about FREQUENCY SCALING FACTOR accoring to Butterworth filter but i don't understand
    why for example wiki has wrong fcut. what is this value?

    at pages 9 to 10 texas instruments has some tables with FSF depending of what filter design you like.BUT ONLY ABOUT LOW PASS FILTERS....
    http://www.ti.com/lit/an/sloa049b/sloa049b.pdf

    please someone to explain.thanks a lot :D:eek:
     
  2. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    652
    May 8, 2012
    Your Wiki link is returning "No file by this name found".

    Chris
     
  3. Fovakis

    Fovakis

    2
    0
    Jun 15, 2013
  4. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    652
    May 8, 2012
    When I ran it I get the following using an ideal OpAmp..

    -3dB=10KHz
    -6dB=16KHz
    -20dB=48KHz

    Chris
     
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