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Find the cut-off frequency

  1. May 12, 2009 #1
    i did the lab and find all varible
    but I can understand how find cut-off frequency
    the question is
    From you result in table Find the cut-off frequency


    circuit figure

    1ibud1.jpg

    lab result
    http://img19.imageshack.us/img19/6967/80959768.png [Broken]


    thanks so much in advance
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. May 25, 2009 #2
  4. May 25, 2009 #3

    CEL

    User Avatar

    The cutoff frequencies arethe frequencies where the gain is 3dB below the gain at the the middle frequencies.
    Since your gain at middle frequency is 17.6 dB, you should extend your measurements below 20HZ and above 20kHz (probably several MHz), to find the cutoff frequencies.
     
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