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Analog Filter Design Toolbox

4.8 | 17 ratings Rate this file 63 Downloads (last 30 days) File Size: 996 KB File ID: #9458 Version: 1.2
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Analog Filter Design Toolbox


James Squire (view profile)


27 Dec 2005 (Updated )

GUI to design and simulate active (opamp) LP and HP Bessel, Butter, Cheby, and Elliptic filters.

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Analog Filter Design (AFD) Toolbox allows the user to design, analyze, and simulate active analog filters easily in a graphical (GUI) environment. It was developed at MIT and is currently used in several universities to teach signal processing concepts. It can be used to build Butterworth, Bessel, Chebychev I and II, and elliptic filters. It can display time and frequency responses, pole/zero plots, transfer functions, circuit diagrams, and provides the ability to simulate filtering of user-supplied and standard data types (e.g. sinusoidal, squarewaves, EKG data).

To use, type AFD from the command prompt. The toolbox includes a comprehensive user's manual.

It has been tested to work up to Matlab R2011b, and likely will work beyond that.

Required Products MATLAB
MATLAB release MATLAB 8.0 (R2012b)
Other requirements None
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Comments and Ratings (25)
22 May 2014 Bruce

Bruce (view profile)

why i cannot download the file?

18 Apr 2014 Shankar Thirunakkarasu

18 Apr 2014 Shankar Thirunakkarasu

This a pretty good tool. I like it.

Some Features that could be added in the newer version:
1. Group Delay plot
2. Drag zeros and poles or add/delete zeros and poles and see the change in the filter response and also circuit realization.
3. Bandpass/Bandstop
4. Passive realizations

These things would make it a complete package differentiating it from all other products on market.

Comment only
10 Jan 2014 Gediminas

23 Oct 2013 Weijian


17 Sep 2012 Jerry Walker

I can not download a usuable file

Comment only
06 Jun 2012 Marko Neitola

Marko Neitola (view profile)

Excellent work. If you could only add more features, i would recommend it to my students.
What i need is:
- Bandpass and bandreject filter design and synthesis
- A simple LC filter syntesis feature would be great, like in Wilamowski's matlab GUI toolbox (
- group delay plot in the analysis menu

25 Feb 2012 w sq

w sq (view profile)

very good.

Comment only
31 May 2011 Cor Cisna


15 May 2009 Comsats Comsats

hello Sir i need to know how can i implement a 4th order chebychev filter? actually we are working on sound based UGV and to filter out the noise factors we would need chebychev filters of 4th order 8 of them. so i need ur urgent help and cooperation in this regard...will be pleased to hear from you soon...

04 Jul 2008 wade o

it is very good in use

19 Jun 2008 kris adi

i'll download . thanks

Comment only
18 Apr 2008 indri fatima

why i can open it, if run it is always problem with
from guiplotfrequencyrespone.m

please need ur help

Comment only
14 Apr 2008 mostefa benmeddour


Comment only
04 Oct 2007 Robin Mallett

Great! It would be interesting to have passive filter designs too.

29 Sep 2007 Henry Chen

Do you have BP filter design Toolbox?

15 Jun 2007 Cuauhtemoc Carbajal

15 Jun 2007 Nagu Rangan


23 Jan 2007 YiKuang Chen

Thanks for sharing!

13 Nov 2006 M T


07 Nov 2006 John Smith

16 Oct 2006 doaa elmatary

h ned it for my project ,,,, thank you

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05 Oct 2006 Ryan Thomas


very good , thank the atributor

29 Dec 2005 Michael Robbins

I haven't examined the code, but the GUI sure looks nice!

Comment only
19 Jan 2012 1.1

This version fixes compatibility with R2011b.

12 Sep 2012 1.2

Updated to include an App file for R2012b

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