<div dir="ltr">The Steiner Parker filter is the closest to a differential diode Sallen Key structure I've seen. Is that what you're thinking of?<div><br></div><div>Andy</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 8 Feb 2019 at 17:20, Ben Riggs <<a href="mailto:benalog1977@gmail.com">benalog1977@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div style="word-wrap:break-word;line-break:after-white-space">Great reference but that’s not it.<div><br></div><div>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.</div><div><br></div><div>Ben.<br><div><br><blockquote type="cite"><div>On 8 Feb 2019, at 4:01 pm, Lloyd Abbott <<a href="mailto:lloydabbott94@gmail.com" target="_blank">lloydabbott94@gmail.com</a>> wrote:</div><br class="gmail-m_-3827759153599323630Apple-interchange-newline"><div><div dir="ltr"><div dir="ltr">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.<div><br></div><div>Link:</div><div><a href="http://www.timstinchcombe.co.uk/synth/Moog_ladder_tf.pdf" target="_blank">http://www.timstinchcombe.co.uk/synth/Moog_ladder_tf.pdf</a> </div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Feb 8, 2019 at 8:27 AM Ben Riggs <<a href="mailto:benalog1977@gmail.com" target="_blank">benalog1977@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">Hi SDIY Peeps,<br>
<br>
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.<br>
<br>
Can anyone help finding the document?<br>
<br>
Cheers,<br>
Ben.<br>
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