Active, Passive, Digital, Switched Capacitor
Filter Design Program

PCFILTER is similar to the passive version published in the July 1991 issue of RF Design Magazine except that it is much more extensive and is available through Artech House  (617-769-9750), or Crestone Technical Books (770-908-2320).

Download a DOS mouse driver from the software page if you lack mouse control with PCFILTER.
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PC Filter: Software and User's Manual

Michael G. Ellis, Sr.

An extended and updated version of the winning software entry in the 1991 RF Design Awards contest. Synthesizes filters and aids in their specification — including active, passive, FIR digital, IIR digital, and parasitic insensitive switched capacitor circuits. Includes optimization capability and supports numerous active filter topologies. ISBN 0-89006-697-3

Artech House 1994, 79 page manual plus software, $325.00

Because the program is so comprehensive, only few sample screens can be shown here.

Input screen for a Finite Impulse Response digital filter.

Sample input screen for a Finite Impulse Response filter using Remez Exchange.

Utility input screen.

Sample screen shown a VCVS stage for a multistage active filter.

Sample screen for a custom switched capacitor filter.

Calculating the order of a filter needed to satisfy bandpass requirements.

The least squares approximation can successfully reproduce an 8th order elliptic filter from only 11 measured values of magnitude and phase. A sample input screen is shown above.

Input screen for 90 degree phase splitter network.

Resulting component values for the 90 degree phase splitter network.

Topology for the 90 degree phase splitter network.

This PCFILTER Software and User's Guide can also be ordered from

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