Variable self-powered light detection CMOS chip with real-time adaptive tracking digital output based on a novel on-chip sensor

Hong Yi Wang, Youyou Fan, Zhijian Lu, Tao Luo, Houqiang Fu, Hongjiang Song, Yuji Zhao, Jennifer Blain Christen

Research output: Contribution to journalArticle


This paper provides a solution for a self-powered light direction detection with digitized output. Light direction sensors, energy harvesting photodiodes, real-time adaptive tracking digital output unit and other necessary circuits are integrated on a single chip based on a standard 0.18 µm CMOS process. Light direction sensors proposed have an accuracy of 1.8 degree over a 120 degree range. In order to improve the accuracy, a compensation circuit is presented for photodiodes’ forward currents. The actual measurement precision of output is approximately 7 ENOB. Besides that, an adaptive under voltage protection circuit is designed for variable supply power which may undulate with temperature and process.

Original languageEnglish (US)
Pages (from-to)24138-24147
Number of pages10
JournalOptics Express
Issue number20
StatePublished - Oct 2 2017


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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