[sdiy] $100 Chip fab service

[cheater00 cheater00]

Who said everything has to be digital? Just the output must be digital. You
could use an ADC and DAC to bridge over the bus.

And yeah, 1.8V, doesn't matter for the inner life of the chip anyways, it's
not like you must run synth circuits at +/-15V

On Tue, 1 May 2018 16:26 Eric Brombaugh, <ebrombaugh1 at cox.net> wrote:

> On 05/01/2018 07:16 AM, Neil Johnson wrote:
> > Hi,
> >
> > On 1 May 2018 at 12:55, cheater00 cheater00 <cheater00 at gmail.com> wrote:
> >> So apparently the people behind RISC V want to start a service where
> you can
> >> send your chip designs in and get them made. I wonder if this would be
> >> useful for analog.. this could really launch analog synths into the
> >> stratosphere. Perfect replacements for old rare chips, great new
> designs,
> >> better OTAs, oscillators, envelopes, amps... sounds almost too good to
> be
> >> true, so there's good reason to follow this.
> >>
> >> Bear in mind this has loads of transistors.. so you could easily fit
> >> multiple (16? 64?) complex synth voices plus fx plus a micro to control
> them
> >> on one $100 chip and have all sorts of IO, too (probably best muxed as a
> >> single serial line to use as few pins as possible)
> >>
> >> https://hackaday.io/project/152709-itsy-chipsy-make-your-own-100-chip
> >
> > It is supposedly 180nm.  In which case forget about anything above a
> > few volts (typically 1.8V, or maybe up to 5V if you really push it).
> >
> > http://www.onsemi.com/PowerSolutions/content.do?id=16678
>
> Also - $100 gets you 1/64th of the whole die and *no* I/O pins (you must
> share the common power/SPI/JTAG buses).
>
> Thanks, but if I'm going to have to do everything digital anyway I'll
> stick with cheap FPGAs - at least there I can iterate a design without
> blowing a hundred bucks for every pass.
>
> Eric
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