[sdiy] Ladder filters using different different filter topologies.

Andrew Simper andy at cytomic.com
Fri Feb 8 14:42:30 CET 2019


The Steiner Parker filter is the closest to a differential diode Sallen Key
structure I've seen. Is that what you're thinking of?

Andy

On Fri, 8 Feb 2019 at 17:20, Ben Riggs <benalog1977 at gmail.com> wrote:

> 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.
>
> Ben.
>
> 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
>
> On Fri, Feb 8, 2019 at 8:27 AM Ben Riggs <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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>
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