Radiation-Hardened Wide-Temperature Mixed-Signal Library in a 22nm FDSOI CMOS Process

The solicitation topic S13.03 indicates NASA's need to develop technologies for producing space systems that can operate without environmental protection housings in the extreme environments of NASA missions. Key performance parameters of interest are survivability and operation under the following conditions: 1) Very low temperature environments (e.g., temperatures as low as -180 °C, for several NASA missions); 2) Combination of low temperature and radiation environments (e.g., surface conditions at Europa of -180 °C with very high radiation). In response to these needs, Alphacore proposes to design and characterize an innovative radiation-hardened mixed-signal (analog & digital) library that is capable of operating at a wide temperature range which covers cryogenic temperatures (-230 °C to +85 °C). The radiation hardness includes total ionizing dose (TID) of 300krad(Si), immunity to single event latchup and functional interrupt (SEL and SEFI), and low single event upset (SEU) rate. Alphacore’s proposed mixed-signal library includes three key components to any mixed-signal SoC, or ASIC: a phase locked loop (PLL), an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC), to be implemented in the GlobalFoundries (GF) 22nm fully depleted silicon-on-insulator (FDSOI) CMOS process (22FDX). The 3-item mixed-signal library is not the only deliverable in this program, Alphacore will also develop a set of design guidelines for the 22FDX process that space mission IC designers can use to achieve both radiation-hard and highly reliable low-temperature capable systems. The guidelines will include biasing (VDD, back bias) and layout rules which mitigate deleterious effects, such as hot carrier degradation and TID. Alphacore will also develop simulation models that include both TID models and low temperature models. These models can be used in most common design flows.

With Alphacore’s rad-hard mixed-signal library, designers can develop lightweight, high-efficieny electronics and deliver advanced capabilities for next-generation missions to planets, asteroids and comets in deep space, all without the need for heavy protective housing in high radiation and wide temperatures conditions. Future NASA missions that could benefit from this component include Europa Lander, missions to Saturn moons like Titan and Enceladus, along with the Moon-to-Mars program and the Origins Space Telescope

Alphacore’s rad-hard mixed-signal library can expect to enjoy significant demand in the defense sector (e.g., U.S. Space Force, hypersonic missile defense, space-based intelligence, surveillance, and reconnaissance). The commercial space market it growing as well, driven by increased government collaboration and funding, which in turn will push demand.

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