Taproot
Regular
From a quick skim I couldn't see that TSMC uses FDSOI tech? Happy to be corrected.
Maybe this is part of the GF approach by BRN...additional tech / flexibility options?
Bit about FDSOI.
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A Close Look at Major Microelectronics Challenges
To address the shortage of semi-conductors which continues to impact many sectors, including the automotive industry, and meet the growing need for electronic components, its production capacities must significantly increase.www.leti-cea.com
Excerpt from mid 2022.
Where does CEA-Leti stand with regard to the European Chips Act?
CEA-Leti supports the idea of creating three major drivers. One of the major drivers we have proposed would involve working on a technology that emerged in Europe, in our institute, FD-SOI. It is used to produce transistors, small switches that are indispensable to integrated electronic circuits and constituting the smallest processor value unit. Because it provides optimized energy consumption (with an energy saving of 30% compared to other technologies), FD-SOI is extremely interesting for 'embedded' markets, meaning electronics found in connected objects, autonomous cars, nomadic electronics, etc. Millions of connected loudspeakers or GPS microchips are now fitted with it. FD-SOI is also fueling smartphones, such as Google's latest pixel 6 Pro. Industrialized by STMicroelectronics, it is also sold by big companies such as Samsung and GlobalFoundries. FD-SOI is currently produced in 28 nm and 22 nm and will soon be available in 18 nm. To further improve the performance and energy efficiency of FD-SOI, the goal is now to move toward new electronic engineering technology, with ever-smaller 10-nanometer nodes that will meet low consumption market needs in 5 to 7 years. This miniaturization involves a major technological leap. Secondly (by 2026–2030), we will be focusing on GAA technology (Gate-All-Around, including a gate around the conduction channel) with nodes typically around 5 nm. One could say we've invented this technology (first publications in 2006 and first patent filed by CEA-Leti), which will constitute a breakthrough. The second major driver, supported by Imec, the Flemish Interuniversity Microelectronics Center, will be devoted to advanced generation FinFET chips — with nodes equal or less than 2 nm — which use the most advanced lithography techniques (Extreme UV) with equipment that will later be produced by Dutch world leader ASML. The third major driver, generated by the Fraunhofer Institute, in Germany, involves assembly and packaging, which will bring challenges in years to come.
Naturally, we will all need to work together, and we are in regular contact with both Imec and the Fraunhofer.
Also worth a skim through from a few years back.
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FD-SOI Adoption Expands
FD-SOI Adoption Expands Technology shifts direction after years of competing directly with CMOS at advanced nodes.semiengineering.com
Foundries Prepare For Battle At 22nm
from 2018But choosing one 22nm technology from a given foundry may be far different than 22nm at a different foundry. There are three different versions of 22nm being rolled out by different foundries:
- TSMC and UMC are developing a 22nm planar bulk CMOS process.
- GlobalFoundries is gearing up a 22nm planar FD-SOI technology.
- Intel is pushing a low-power 22nm finFET technology.

Foundries Prepare For Battle At 22nm
Foundries Prepare For Battle At 22nm Bulk CMOS, FD-SOI and finFETs all on tap as big players vie for differentiation. But where do chipmakers go after 28nm?

This article may answer a few questions in the the context of today's press release.
"The AKD1500 reference chip using GlobalFoundries’ very low-leakage FD SOI platform, showcases the possibilities for intelligent sensors in edge AI.” Anil Mankar