[sdiy] standard filters from ladder topology?

JH. jhaible at debitel.net
Sun Sep 4 00:14:45 CEST 2005


Is it possible to get "standard" low pass filters such as Butterworth,
Bessel, etc., from a Moog ladder
with multiple feedback (or feed forward) loops?

Normally, these filters are described by pole pairs (or corner frequency and
Q pairs) for multiple
sections of 2pole stages connected in series.

My clouded memory from school also reminds me that there are canonic forms
that use chains
of integrators (1/s) with multiple feedback loops from individual stages
back to a summing node
at tthe first stage.

But is a similar method possible, using a chain of "lossy integrators"
(1/1+s), with multiple
feedback loops?

JH.




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