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Titre: Ultra-low-power CMOS circuit design with very low supply voltage
Conférencier: Carlos Galup-Montoro , Universidade Federal de Santa Catarina (UFSC), Brésil
Lieu: Zoom ,
Date et heure:
jeudi le 06 juin 2024 de 10:00 à 15:00

Résumé: In the realm of digital circuits, achieving optimal energy efficiency often involves operating in the subthreshold region at supply voltages ranging from 200 to 400 mV. In scenarios where power is derived from very low voltage sources like TEG or in devices with extended standby periods, such as those found in IoT applications, operating below 200 mV or even 100 mV becomes not only beneficial but essential.The minimum supply voltage for the standard inverter-based CMOS logic is 36 mV at room temperature. In this course, we review some circuits that can operate from voltages below that limit. We show that the stacked or redundant inverter element can lower the minimum supply voltage to 30 mV. Also shown are some circuits that use the common gate topology, positive feedback, and passive voltage gain for attaining a minimum supply voltage below the 36 mV limit. Finally, we review the case of the voltage rectifier for which there is no hard low voltage limit for the input signal. For each of the circuits presented, we focus on the design parameters that must be tuned to allow operation at the lowest supply voltage. In the lecture, we will discuss key issues for ULV circuits, such as MOS transistors with near-zero threshold voltage, modeling features, ULV biasing, and building blocks. A brief section on ULV circuits for energy harvesting is also included.

Note biographique: Carlos Galup-Montoro (M’89, SM’17) studied Engineering Sciences at the University of the Republic, Montevideo, Uruguay, and Electronic Engineering at the National Polytechnic School of Grenoble (INPG), France. He received an Engineering degree in electronics in 1979 and a doctorate in 1982, both from INPG. From 1982 to 1989 he worked at the University of São Paulo, Brazil. Since 1990 he has been with the Department of Electrical and Electronics Engineering, Federal University of Santa Catarina, Florianópolis, Brazil, where he is currently a professor. In the second semester of the academic year 1997-1998 he was a research associate with the Analog Mixed Signal Group, Texas A&M University. He was a visiting scholar at UC Berkeley from 2008 to 2009 and at IMEP/INPG in the first trimester of 2017.

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