[sdiy] Ladder filters using different different filter topologies.

Ben Riggs benalog1977 at gmail.com
Fri Feb 8 10:20:52 CET 2019

Great reference but that’s not it.

Basically, I’m trying to nut out a Sallen-key filter using diodes as current controlled resistors in a ladder/differential topology to remove the CV-bleed… but I can’t help but think I’ve seen it before.


> On 8 Feb 2019, at 4:01 pm, Lloyd Abbott <lloydabbott94 at gmail.com> wrote:
> My guess is that you're thinking of Tim Stinchcombe's paper, "Analysis of the Moog Transistor Ladder and Derivative Filters," where he compares transistor and diode ladder filters.
> Link:
> http://www.timstinchcombe.co.uk/synth/Moog_ladder_tf.pdf <http://www.timstinchcombe.co.uk/synth/Moog_ladder_tf.pdf> 
> On Fri, Feb 8, 2019 at 8:27 AM Ben Riggs <benalog1977 at gmail.com <mailto:benalog1977 at gmail.com>> wrote:
> Hi SDIY Peeps,
> The last week I’ve been musing about filter designs, and (by default) to solve the CV bleed through I keep thinking ladder design. Then I keep remembering a document that I can’t reference that had different filter topologies based about the ladder design.
> Can anyone help finding the document?
> Cheers,
> Ben.
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