Chebyshev Filters

Discussion in 'General Electronics Chat' started by u02nb5, Nov 28, 2008.

  1. u02nb5

    Thread Starter New Member

    Jan 19, 2007
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    Why would you use one?? where are they mainly found???

    (Like Butterworth filters are normally used in music systems because of their flatness in the passband)
    (I understand they produce a steeper roll off near the cut-off region)

    thanks for any help

    nick
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Chebychev filters have relatively high ripple in the passband, but a very steep dropoff into the stopband. It's much closer to a "brick wall" response than many other types.

    They're very useful for suppression of RF energy outside of a given frequency range.
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    There is no simple answer to that question. Butterworth is common in audio for the reason stated, but this article - http://www.maxim-ic.com/appnotes.cfm/appnote_number/733/ - will get you started on the utility of the various responses.

    Wikipedia has very good articles on the various filters, too.
     
  4. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287
    Chebychev filters are most commonly used in radio R.F. and I.F. stages, where steep cutoff is more important than absolutely flat response. With enough poles, a Chebychev can be made as flat in the passband as you want, anyway.

    eric
     
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