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Butterworth filter

  1. Dec 4, 2005 #1
    Does anyone know of a good tutorial/book that explains Butterworth filter and filters in general?
    Thanks in advance.
  2. jcsd
  3. Dec 4, 2005 #2


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    Staff: Mentor

    Are you interested mainly in the analog aspects like with opamps, or digital filters? The digital filter book that I suggested in a recent thread is pretty good, and it talks a little about analog implementations in a later chapter. The Horowitz and Hill electronics book has a pretty good intro, but doesn't go into a lot of depth about the different filter topologies and tradeoffs.
  4. Dec 4, 2005 #3
    I need analog, our textbook (Lin & DeCarlo) has a chapter, but I need something that explains how the polynomial originates, what's the use of all the terms like inverted ohm's sign and all the standard notations used. In other words, something basic and detailed :frown: .
    I can do the hw, but i don't feel like i have a good grasp on what is going on.
  5. Dec 4, 2005 #4
    Introduction to random signals and applied kalman filtering:


    If those kinds of filters are what ur talking about, but thats for grad work. I have the book, im not a grad student, but I was told its good by ppl at work so I bought it. Hope to read thorough it someday in the near future.
  6. Dec 5, 2005 #5


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    Staff: Mentor

    I googled the following:

    analog filter polynomial tutorial butterworth cheby

    and got lots of interesting hits. Maybe try that google to see if it helps.
  7. Jul 10, 2008 #6
    Hi all,
    I am designing a high pass filter which has cut off frequency of 50 Hz. I have chosen butterworth filter to do this. But the problem is, the output shows a phase shift and the cutoff is about 30 Hz..Could anyone give a suggestion of how to have zero phase shift and cut off at 50Hz?
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