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

[Gordonjcp]

On Sat, Aug 06, 2022 at 03:18:55PM +0200, cheater cheater via Synth-diy wrote:

> A friend who works at a semiconductor fab told me that the process
> might not support bipolar transistors (he just doesn't know if it
> does), but I'm not sure how necessary those are for the purpose of
> creating audio chips?

If you want to (re-)create yer classic CA3080-style OTA you'll need bipolar transistors.

I wonder if you can mix bipolar and MOS on the same die? If you can, then you could implement the analogue end of an EDP Wasp in a single chip. DCO and envelopes are LM3900 (bipolar), VCF is CD4069UBE (there's your MOS) and CA3080 (bipolar) and obviously VCA is CA3080.

-- 
Gordonjcp