LF: Re: [UKMicrowaves] Active Filters and k, q values

[Andy Talbot <andy.g4jnt@gmail.com>]

Thanks for comments received so far

It looks as if there isn't going to be a direct conversion.  The two sets of coefficients I'm trying to relate both seem to be  derived from the basic transfer function (Butterworth, Chebyshev etc) via differnet routes - so what I was hoping to do would effectively be trying to merge the two differing solutions.

It was mostly a matter of scientific / mathematical interest, as I can always model circuits and adjust values to suite

Andy

www.g4jnt.com

On Sat, 20 Jul 2019 at 16:25, Andy G4JNT via Groups.Io <andy.g4jnt=gmail.com@groups.io> wrote:

Does anyone know how, or if, the k and q values listed for filters in books like Zverev or  Mathei Young and Jones can be converted to cutoff frequency and damping for each of the stages of a Sallen-Key opamp filter ?

I have the "Active-Filter Cookbook" by Don Lancaster, which has plenty of designs and examples but only for a very small number of basic filter shapes and only up to order six.  Whereas those books have pages upon pages of values for every size and shape imaginable and more besides.

It's just turning the values into the form needed for opamps I don't know how.

The Cookbook does delve into the maths behind active filter design, but I'm still missing some fundamental connection.

Andy

www.g4jnt.com

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