A fully integrated light-powering system with integrated CMOS photovoltaic cell for batteryless IoT devices

Po Han Chen, Chao Yi Huang, Hao Chung Cheng, Po Hung Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents a fully integrated CMOS light-powering system, integrating CMOS photovoltaic cell and energy harvesting interface, for batteryless internet of things (IoT). The CMOS photovoltaic cell employs deep N-well (DNW) based structure to improve the light-electric conversion efficiency. The energy harvesting interface utilizes a fully integrated two-stage switched-capacitor dc-dc converter to provide an appropriate output voltage for load circuits. It provides 1 V and 0.9-1.1 V output under light load and heavy load, respectively. The chip is designed and fabricated by 180-nm CMOS process, without using any off-chip components, except a storage capacitor for testing. The experimental results demonstrate that the proposed 1mm x 2mm fully integrated light-powering system can periodically provide 0.9 V to 1.1 V output voltage to power 1-mA loading circuit. The proposed interface achieves 70 percent peak-efficiency at 1 μA and higher than 60 percent efficiency over 0.5 μA to 2 μA loading currents.

Original languageEnglish
Title of host publication2019 26th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages907-910
Number of pages4
ISBN (Electronic)9781728109961
DOIs
StatePublished - Nov 2019
Event26th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2019 - Genoa, Italy
Duration: 27 Nov 201929 Nov 2019

Publication series

Name2019 26th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2019

Conference

Conference26th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2019
CountryItaly
CityGenoa
Period27/11/1929/11/19

Keywords

  • Energy harvesting
  • On-chip photovoltaic cell
  • Switched-capacitor dc-dc converter

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    Chen, P. H., Huang, C. Y., Cheng, H. C., & Chen, P. H. (2019). A fully integrated light-powering system with integrated CMOS photovoltaic cell for batteryless IoT devices. In 2019 26th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2019 (pp. 907-910). [8965010] (2019 26th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2019). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICECS46596.2019.8965010