Free program helps you design filters.(Brief Article)

Test & Measurement World, November, 2005 by Squire, James

At one time or another, you'll probably need to design an analog filter. Despite an abundance of digital filter design tools (for example, the excellent FDA-Tool bundled with Matlab's Signals toolbox), there are few general-purpose GUI tools for synthesis of arbitrary active analog filters.

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To help students and the engineering community, I developed Analog Filter Design (AFD), an intuitive active analog filter design tool. Four universities currently use it as a teaching tool. AFD lets you design, analyze, and simulate Bessel, Butterworth, Chebychev I and II, and elliptic filters up to the 8th order of arbitrary passband gain using more than 10 different circuit topologies (see figure). It runs under one master GUI as a Matlab...

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