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Proceedings Paper

Image sensor based on pulse frequency modulation for retinal prosthesis
Author(s): Jun Ohta; Norikatsu Yoshida; Tetsuo Furumiya; Keiichiro Kagawa; Masahiro Nunoshita
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Paper Abstract

We demonstrate an application of a CMOS image sensor using pulse frequency modulation for retinal prosthesis. To increase the sensitivity we use a pulse frequency modulation (PFM) instead of a conventional integration method. The fundamental device characteristics of PFM are described. Based on the results of the PFM pixel circuit, we have fabricated A 128 X 128 pixel array chip using 0.35 micrometers CMOS technology, and successfully demonstrated to capture images by using this chip. For the application of the PFM to retinal prosthesis, the output characteristics of PFM are modified in the frequency range, current stimulation, and biphasic output. Also future issues for implantation are discussed.

Paper Details

Date Published: 24 April 2002
PDF: 6 pages
Proc. SPIE 4669, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications III, (24 April 2002); doi: 10.1117/12.463450
Show Author Affiliations
Jun Ohta, Nara Institute of Science and Technology (Japan)
Norikatsu Yoshida, Nara Institute of Science and Technology (Japan)
Tetsuo Furumiya, Nara Institute of Science and Technology (Japan)
Keiichiro Kagawa, Nara Institute of Science and Technology (Japan)
Masahiro Nunoshita, Nara Institute of Science and Technology (Japan)


Published in SPIE Proceedings Vol. 4669:
Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications III
Nitin Sampat; John Canosa; Morley M. Blouke; John Canosa; Nitin Sampat, Editor(s)

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