Chapter 23

FilterCAD user’s manual, version 1.10

What is filtercad?

FilterCAD is designed to help users without special expertise in filter design to design good filters with a minimum of effort. It can also help experienced filter designers achieve better results by providing the ability to play “what if” with the values and configuration of various components.

With FilterCAD, you can design any of the four major filter types (lowpass, highpass, bandpass and notch), with Butterworth, Chebyshev, Elliptic, or custom-designed response characteristics. (Bessel filters can be realized by manually entering pole and Q values, but FilterCAD cannot synthesize a Bessel response in this version.) FilterCAD is limited to designs which can be achieved by cascading ...

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