<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi guys,<div><br></div><div>Allow me to bump up a not so old thread, as for me it recently became very accurate. I'm trying to finish a very compact S&H and T&H module for my own purposes. </div><div><br></div><div>The requirements are basically</div><div>(1) capable of working on CVs (low enough droop to maintain a VCO in tune during 1 minute hold time)</div><div>(2) capable of working on audio rate (as sample rate reducer)</div><div>(3) low clock bleed through</div><div><br></div><div>I explored the options around, and was charmed by the design of Ian Fritz (Super S&H) as well as by the LF398-based one by Rene Schmitz. I've also been considering to draw my own, and was thinking about using a OPA1679 (which I use more often) as it has a typical 10pA input bias current, and I'm trying to decide between the quad MOSFET switches (from the Super S&H) or a plain DG41x series. I have difficulty judging which of these options would best suite my needs, without being overkill, so I hope you can share some experiences and insights? I'm especially interested to know how easily the LF398 is outperformed by other designs. And I'm hoping to learn a bit more about the (dis)advantages of the quad MOSFET switching in the Super S&H over other options (jFET, DG-switch, OTA or even 2164?).</div><div><br></div><div>Regards,</div><div><br></div><div>Rutger</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br><div><div>On 9 jun 2018, at 00:11, Ian Fritz wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><meta http-equiv="content-type" content="text/html; charset=utf-8"><div dir="auto"><div></div><div>Have another look at my most recent, then:</div><div><a href="http://ijfritz.byethost4.com/sy_cir14_SH.htm">http://ijfritz.byethost4.com/sy_cir14_SH.htm</a></div><div><br></div><div>Ian</div><div><br></div><div><br><span style="font-size: 12.8px;">For a synth module, I'd expect a S/H device to work well from as low as 50 uS sampling (of a 20kHz waveform) and as long as a minute hold time (a long sustained CV for a VCO), to cover all possible applications</span></div></div>_______________________________________________<br>Synth-diy mailing list<br><a href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br>http://synth-diy.org/mailman/listinfo/synth-diy<br></blockquote></div><br></div></body></html>