Transistor Downscaling toward Ultra-Low-Power, sub-100 mum2 and sub-Hz Oscillators

Konferenz: SMACD / PRIME 2021 - International Conference on SMACD and 16th Conference on PRIME
19.07.2021 - 22.07.2021 in online

Tagungsband: SMACD / PRIME 2021

Seiten: 4Sprache: EnglischTyp: PDF

Barbruni, Gian Luca (Medtronic Chair in Neuroengineering and Integrated Circuits Laboratory, Ecole polytechnique federale de Lausanne, Switzerland)
Bielli, Chiara; Demarchi, Danilo (DET, Politecnico di Torino, Turin, Italy)
Carrara, Sandro (Integrated Circuits Laboratory, Ecole Polytechnique Federale de Lausanne, Neuchatel, Switzerland)

This paper analyses and discusses the feasibility of implementing sub-Hz range oscillators in ultra-low-power and ultra-miniaturised implants. The final aim is the Body Dust application, in which multiple freestanding smart cubes are wirelessly powered and freely to move in the human blood for bio-sensing purpose. That system requires an overall size smaller than 100 mum2 and ultra-low power consumption. Two different CMOS technologies have been compared, analyzing the effect of transistor down-scaling in sub-Hz range oscillators. Four CMOSbased oscillators have been tested in both 0.18 mum and 28 nm technologies. The best result is the Schmitt Trigger-based timer implemented in FD-SOI 28 nm and combined with a ten stages frequency divider that oscillates at 122.5 mHz with a reduced area of 80 mum2. The study demonstrate that the effect of transistor downscaling opens the possibility to reach a sub-Hz oscillator with both ultra-low-power and ultra-low-area consumption, so suitable for Body Dust application.