<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">We could have used 64 OTAs in the Zähl CV channel! Instead it has 56 x THAT2162.<div class=""><br class=""></div><div class="">Mark</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Aug 5, 2022, at 8:44 PM, Peter Pearson via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">What are you going to make with 64 OTAs on a chip? Just curious.</div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Aug 5, 2022 at 2:20 PM cheater cheater via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Google are running a program where if you submit open source chip<br class="">
designs they'll produce them either cheaply or for free on a 180 nm<br class="">
process.<br class="">
<br class="">
"We sponsored six shuttle runs over the course of two years, allowing<br class="">
the open source community to submit more than 350 unique designs of<br class="">
which around 240 were manufactured at no-cost."<br class="">
<br class="">
Is this a process that could be used for analog synth parts? We could<br class="">
use new OTA chips, and I think I wouldn't mind a chip with 64<br class="">
monolithic OTAs on it, or chips with full voices, etc. With this<br class="">
feature size, leaps and bounds beyond the last time synth chips were<br class="">
being miniaturized, we could go wild with designs.<br class="">
<br class="">
Apparently they already have solutions for on-chip passives, single<br class="">
transistors, and relatively "high" voltages (10V), so the next<br class="">
question is how they would handle something like an OTA, VCA, op amp,<br class="">
etc, since most users seem to be focusing on digital chips.<br class="">
<br class="">
"The GF 180nm technology platform offers open source silicon designers<br class="">
new capabilities for high volume production, affordability, and more<br class="">
voltage options. This PDK includes the following standard cells:<br class="">
- Digital standard cells libraries (7-track and 9-track)<br class="">
- Low (3.3V), Medium (5V, 6V) and High (10V) voltage devices<br class="">
- SRAM macros (64x8, 128x8, 256x8, 512x8)<br class="">
- I/O and primitives (Resistors, Capacitors, Transistors, eFuses)<br class="">
cells libraries"<br class="">
<br class="">
<br class="">
<a href="https://www.phoronix.com/news/Google-GloFo-GF180MCU" rel="noreferrer" target="_blank" class="">https://www.phoronix.com/news/Google-GloFo-GF180MCU</a><br class="">
<br class="">
<a href="https://opensource.googleblog.com/2022/08/GlobalFoundries-joins-Googles-open-source-silicon-initiative.html" rel="noreferrer" target="_blank" class="">https://opensource.googleblog.com/2022/08/GlobalFoundries-joins-Googles-open-source-silicon-initiative.html</a><br class="">
<br class="">
<br class="">
If we can figure out how to take advantage of that, synth chips could<br class="">
become very interesting.<br class="">
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</blockquote></div>
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