SKY130
Beginner
A free, open recipe for making chips from the company SkyWater. Anyone can download it and design a chip with it.
Novice
SkyWater’s 130 nm process, published as an open-source process design kit (PDK): transistor models, design rules and standard-cell libraries anyone can read.
Expert
A mature 180–130 nm hybrid technology with 1.8 V core devices, five metal levels plus a local-interconnect layer, and open SPICE models, which makes it a source of real device numbers.