[sdiy] Can google's free* 180nm OSHW foundry be used for synth parts?

[jslee]

On Sat, 6 Aug 2022, at 04:44, Peter Pearson via Synth-diy wrote:
> What are you going to make with 64 OTAs on a chip?  Just curious.

I have a Eurorack module[1] that is an 8-in/4-out voltage-controlled matrix mixer. 32 VCAs. I've very often wished it had more than four rows, eg. 8x6 or 8x8. If I'm not mistaken, the original application for this module (Guy Ben-Ary's cellF[2] project) had four of this module.

Of course in Eurorack an 8x6 or 8x8 layout would inevitably lead to panel layout compromises that are too horrifying to risk thinking about. Even the 8x4 module I have is pretty cramped and really wants patch cables with skinny connector mouldings.

The cellF performances I attended in Sydney used a horseshoe arrangement of 16 PA speakers... possibly they were using one matrix mixer output per speaker?

To be clear, I'd still far rather develop with dual OTAs, or at most quad OTAs if they were multi-sourced. Has anyone else besides Alfa made a 13704? Big B doesn't seem to have one. I like linear VCA response, so 2164 doesn't count)

[1] https://www.nonlinearcircuits.com/modules/p/cluster
[2] https://guybenary.com/work/cellf/

John
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