RISC-V Chip Made From 15,000 Carbon Nanotube Transistors
takyon writes:
MIT Engineers Build 15,000-Transistor Carbon Nanotube RISC-V Chip
Engineers from the MIT and Analog Devices have created the most complex chip design yet that uses transistors made of carbon nanotubes instead of silicon. The chip was manufactured using new technologies proven to work in a commercial chip-manufacturing facility.
The researchers seem to have chosen the RISC-V instruction set architecture (ISA) for the design of the chip, presumably due to the open source nature that didn't require hassling with licensing restrictions and costs. The RISC-V processor handles 32-bit instructions and does 16-bit memory addressing. The chip is not meant to be used in mainstream devices quite yet, but it's a strong proof of concept that can already run "hello world"-type applications.
One advantage transistors made out of carbon nanotubes have over silicon transistors is that they can be manufactured in multiple layers, allowing for very dense 3D chip designs. DARPA also believes that carbon nanotubes may allow for the manufacturing of future 3D chips that have performance similar or better than silicon chips, but they can also be manufactured for much lower costs.
Also at IEEE.
Modern microprocessor built from complementary carbon nanotube transistors (DOI: 10.1038/s41586-019-1493-8) (DX)
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