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This utility written in Javascript shall help you to quickly design and dimension your active Sallen-Key or Multiple Feedback topology high-pass filter. Enter the desired filter parameters and find the resulting circuit diagrams and component values below.

This page is not intended to teach the basics of filter design. Look at the TI-website for an in-depth article. Links to more filter design software can be found on the New Wave Instruments company website. Also you may have a look at my homepage. You likely won't be able to understand it - it's German.

You also may go to Active Filter Design and Dimensioning (overview) or directly to Active Low-Pass Filter Design and Dimensioning.

No responsibility for any kind of errors or bugs is taken from anybody. This page has been tested with MSIE 6 and Netscape 6.2.

To abbreviate atto, femto, pico, nano, micro, milli, kilo, mega, giga and tera use a, f, p, n, u, m, k, M, G and T

Desired Filter Parameters
Filter Characteristics	Filter Order	Cutoff Frequency	Stage Gain	Desired CX
Bessel (constant Group Delay) Butterworth (no Ripple) Chebychev dB Ripple	1 2 3 4 5 6 7 8 9 10	Hz	Stage Gain:   In Stage(s) Nr:  1 2 3 4 5 Note: Stage Gain < 1 is not available for Sallen-Key	F Sallen-Key: CA = CB = CX Multiple Feedback: (CA + CB) = CC = CX

Sallen-Key component values    Multiple Feedback component values    Spice netlist generator

Stage RA RB Q GBW 1 2 3 4 5

RC, RD if Gain > 1  RC RD

Return to parameter entry