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About: Butterworth Filters

Module by: Richard Baraniuk. E-mail the author

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Name: Butterworth Filters
ID: m10127
Language: English (en)
Summary: Describes the design of analog lowpass Butterworth filters.
Subject: Science and Technology
Keywords: Butterworth filter, lowpass, signals, systems
Document Type: -//CNX//DTD CNXML 0.5 plus MathML//EN
License: Creative Commons Attribution License CC-BY 1.0

Authors: Richard Baraniuk (
Copyright Holders: Richard Baraniuk (
Maintainers: Justin Romberg (, Richard Baraniuk (, Michael Haag (, Harika Basana (

Latest version: 2.10 (history)
First publication date: Jun 21, 2001 12:00 am -0500
Last revision to module: Jul 18, 2005 10:11 am -0500


PDF: m10127_2.10.pdf PDF file, for viewing content offline and printing. Learn more.
XML: m10127_2.10.cnxml XML that defines the structure and contents of the module, minus any included media files. Can be reimported in the editing interface. Learn more.

Version History

Version: 2.10 Jul 18, 2005 10:11 am -0500 by Richard Baraniuk
resized figures and added links

Version: 2.9 Jul 14, 2005 8:30 pm -0500 by Charlet Reedstrom
update to cnxml-0.5

Version: 2.8 Feb 3, 2005 10:51 pm -0600 by Richard Baraniuk
added first pictures...

Version: 2.7 Jun 14, 2002 12:00 am -0500 by (Unknown)
converted module to cnxml-0.4, changed markup of negative numbers, movered msub, and attributes on table, removed hardcoded figure number in reference (changed to cnxn)

Version: 2.6 Nov 28, 2001 12:00 am -0600 by (Unknown)
updated some presentation mathml

Version: 2.5 Nov 26, 2001 12:00 am -0600 by (Unknown)
converted module to cnxml 0.3.5 and updated table tags

Version: 2.4 Nov 20, 2001 12:00 am -0600 by Brent Hendricks
Reverted to CNXML0.3 until tables are converted :(

Version: 2.3 Nov 20, 2001 12:00 am -0600 by Brent Hendricks
Updated to CNXML 0.3.5

Version: 2.2 Jul 20, 2001 12:00 am -0500 by (Unknown)
Added jrom as maintainer in database

Version: 2.1 Jun 21, 2001 12:00 am -0500 by (Unknown)
Initial conversion from 0.1

Version: 2.0 Jun 21, 2001 12:00 am -0500 by (Unknown)
Added initial template for new module m10127

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American Chemical Society (ACS) Style Guide:

Baraniuk, R. Butterworth Filters, OpenStax-CNX Web site., Jul 18, 2005.

American Medical Assocation (AMA) Manual of Style:

Baraniuk R. Butterworth Filters [OpenStax-CNX Web site]. July 18, 2005. Available at:

American Psychological Assocation (APA) Publication Manual:

Baraniuk, R. (2005, July 18). Butterworth Filters. Retrieved from the OpenStax-CNX Web site:

Chicago Manual of Style (Bibliography):

Baraniuk, Richard. "Butterworth Filters." OpenStax-CNX. July 18, 2005.

Chicago Manual of Style (Note):

Richard Baraniuk, "Butterworth Filters," OpenStax-CNX, July 18, 2005,

Chicago Manual of Style (Reference, in Author-Date style):

Baraniuk, R. 2005. Butterworth Filters. OpenStax-CNX, July 18, 2005.

Modern Languages Association (MLA) Style Manual:

Baraniuk, Richard. Butterworth Filters. OpenStax-CNX. 18 July 2005 <>.