Power supply system using electromagnetic induction for three-dimensionally stacked retinal prosthesis chip

Ken Komiya, Risato Kobayashi, Takafumi Kobayashi, Keigo Sato, Takafumi Fukushima, Hiroshi Tomita, Hiroyuki Kurino, Tetsu Tanaka, Makoto Tamai, Mitsumasa Koyanagi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We have proposed a new retinal prosthesis system consisting of a three-dimensionally (3-D) stacked retinal prosthesis chip, a flexible cable with an electrode array stimulus, and a power supply system for the retinal prosthesis chip. Electromagnetic induction with a primary coil and a secondary coil was employed as the power supply system. The power was transmitted to the retinal prosthesis chip through an RF/DC voltage conversion chip that converted AC voltage into DC voltage. The 3-D stacked retinal prosthesis chip operates with a DC supply voltage of 3.3 V, and the secondary coil requires a transmitted voltage that is 1 V higher than the DC supply voltage. In order to receive a sufficient supply voltage, several parameters such as external supply voltage and transmission frequency were optimized. A peak RF voltage of 4.5 V was obtained when we employed a primary coil with 50 turns, a secondary coil with 20 turns, an external supply voltage of 4.1 V, and a frequency of 3 MHz. We also successfully fabricated Schottky barrier diodes to rectify the RF voltage received by the secondary coil. The fabricated Schottky barrier diodes have a high breakdown voltage of 4.6V, which is sufficient for our 3-D stacked retinal prosthesis chip.

Original languageEnglish
Pages (from-to)3244-3247
Number of pages4
JournalJapanese journal of applied physics
Volume47
Issue number4 PART 2
DOIs
Publication statusPublished - 2008 Apr 25

Keywords

  • Power supply
  • Retinal prosthesis
  • Schottky barrier diode
  • Secondary coil

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Power supply system using electromagnetic induction for three-dimensionally stacked retinal prosthesis chip'. Together they form a unique fingerprint.

  • Cite this

    Komiya, K., Kobayashi, R., Kobayashi, T., Sato, K., Fukushima, T., Tomita, H., Kurino, H., Tanaka, T., Tamai, M., & Koyanagi, M. (2008). Power supply system using electromagnetic induction for three-dimensionally stacked retinal prosthesis chip. Japanese journal of applied physics, 47(4 PART 2), 3244-3247. https://doi.org/10.1143/JJAP.47.3244