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

from [Andy Talbot] [Permanent Link][Original]
To: "UK Microwaves groups.io" <[email protected]>
Subject: LF: Re: [UKMicrowaves] Active Filters and k, q values
From: Andy Talbot <[email protected]>
Date: Sun, 21 Jul 2019 21:48:30 +0100
Cc: [email protected], "[email protected]" <[email protected]>
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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



On Sat, 20 Jul 2019 at 16:25, Andy G4JNT via Groups.Io <andy.g4jnt=[email protected]> 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.

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