FilterPro? Multiple Feedback (MFB) and Sallen-Key Design Program is a Windows application. This application designs MFB and Sallen-Key low-pass and high-pass filters using Voltage Feedback Op Amps, resistors and capacitors. It also supports a fully-differential version of the MFB circuit. This program includes Bessell, Butterworth, Chebychev, and linear phase filter types and can be used to design filters from 1 to 10 poles. The capacitor values in each stage can be either selected by the computer or entered by the designer. An "always on" prompt window provides context-sensitive help information to the user. The response of the filter is displayed on a graph, showing gain, phase and group delay over frequency.

A new version of FilterPro is now available, Version 2.0, that includes band-pass, notch, wide-band-pass, and band-reject circuits.

The FilterPro V2.0 band-pass circuit is based on the MFB circuit. Because the band-pass filter is most often used for tone detection and high Q filters usually need high gain, a method was found to make the gain equal to the Q of the filter. When this is done the sensitivity to variation of the passive components is reduced allowing for a more reproducible filter.

The FilterPro V2.0 notch circuit is a dual amplifier circuit whose sensitivity to variation of passive components is also reduced compared to the traditional twin-T circuit. This filter is often used to block specific tones such as 60 Hz, 120 Hz, 1kHz, etc.

The FilterPro V2.0 wide-band-pass filter uses a high-pass filter cascaded with a low-pass filter. This is very useful for band-pass filters with a Q of less than 1 because the passband response is easily made flat and because the filter types such as Bessell, Butterworth, etc. are used.

The FilterPro V2.0 band-reject filter uses a high-pass filter summed with a low-pass filter. This is useful to block a wide band of frequencies. It is also useful if the gain above the blocked band of frequencies is desired to be different than the gain below the blocked band.

特性
The completed design can be saved, loaded, or printed.

Installation Recommendations:

Download file to your hard drive
Unzip file
Run the executable file with NO other programs running