The design of CMOS self-powered 256-pixel implantable chip with on-chip photovoltaic cells and active pixel sensors for subretinal prostheses

Chung-Yu Wu, Wei Jie Sung, Po Han Kuo, Chi Kuan Tzeng, Chuan Chin Chiao, Yueh Chun Tsai

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

14 Scopus citations

Abstract

A photovoltaic-cell-powered CMOS 256-pixel implantable chip is proposed for subretinal prostheses. In the proposed chip, the divisional power supply scheme (DPSS) and the active pixel sensor (APS) are adopted to improve the efficiency of output stimulation currents and the image sensitivity. The proposed chip consists of a 16×16 photodiode array with 8 DPSS divisions, control signal generator circuits, and photovoltaic cells. It is designed and fabricated in 180-nm CMOS image sensor (CIS) technology. The chip size is 3mm × 3mm. The measured frequency of eight-phase control signals is 47.68 Hz under signal light intensity of 5 mW/cm2 and background IR intensity of 80 mW/cm2. The measured output stimulation current is 19.9 0 μA under 10-kΩ load. Under the equivalent electrode impedance load, the measured frequency of eight-phase control signals is 45.45 Hz. The measured peak output stimulation current is 19.52 μA and the amount of injected charges per pixel is 4.03nC. The measurement results have verified the correct function of the proposed subretinal implant chip.

Original languageEnglish
Title of host publicationIEEE Biomedical Circuits and Systems Conference
Subtitle of host publicationEngineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479972333
DOIs
StatePublished - 4 Dec 2015
Event11th IEEE Biomedical Circuits and Systems Conference, BioCAS 2015 - Atlanta, United States
Duration: 22 Oct 201524 Oct 2015

Publication series

NameIEEE Biomedical Circuits and Systems Conference: Engineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings

Conference

Conference11th IEEE Biomedical Circuits and Systems Conference, BioCAS 2015
CountryUnited States
CityAtlanta
Period22/10/1524/10/15

Keywords

  • active pixel sensor
  • CMOS image sensor
  • divisional power supply scheme
  • photovolltaic cell

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