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Passive butterworth filter design

  1. Jun 20, 2010 #1

    I'm looking for a guide on the steps to design passive butterworth filters, specifically the steps on how to find the L and C passive elements using the butterworth polynomial, the cutoff frequency, and the terminating/load resistance. Is it necessary to use continued fractions? My 'textbook' is unclear and I can't seem to find any decent resource online.

  2. jcsd
  3. Jun 20, 2010 #2
    You end up solving polynomials. Here's Butterworth's paper. It's pretty readable.

    http://www.expertran.com/butter/paper.pdf [Broken]
    Last edited by a moderator: May 4, 2017
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