An illuminance sensor integrated with analog digital converter using pulse density modulation

Shunsuke Yamada, H. Toshiyoshi

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


A ring oscillator and a photovoltaic cell are combined for the first time to develop a battery-less illuminance sensor of high sensitivity. The photovoltaic cell works as a photo detector and a power source for the ring oscillator, which digitalizes the analog output value from the cell into digital value by pulse density modulation. The developed sensor detects luminance from 25 lx up to 25,000 lx, varying its oscillation frequency from 21 kHz to 7.7 MHz, corresponding to a dynamic range of 58 dB.

Original languageEnglish
Title of host publicationIEEE SENSORS 2017 - Conference Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages3
ISBN (Electronic)9781509010127
Publication statusPublished - 2017 Dec 21
Externally publishedYes
Event16th IEEE SENSORS Conference, ICSENS 2017 - Glasgow, United Kingdom
Duration: 2017 Oct 302017 Nov 1

Publication series

NameProceedings of IEEE Sensors
ISSN (Print)1930-0395
ISSN (Electronic)2168-9229


Other16th IEEE SENSORS Conference, ICSENS 2017
Country/TerritoryUnited Kingdom


  • battery-less sensor
  • luminance sensor
  • photovoltaic cell
  • pulse density modulation
  • ring oscillator

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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