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Proceedings Paper

Application of pulse frequency modulation photosensors to subretinal artificial retina implantation
Author(s): Keiichiro Kagawa; Norikatsu Yoshida; Tetsuo Furumiya; Jun Ohta; Masahiro Nunoshita
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Paper Abstract

In this paper we discuss an application of CMOS photo-sensor array chip using pulse frequency modulation (PFM) to sub-retinal implantation to recover human vision. PFM with integration mode as photo-sensing circuit is used to realize enough dynamic range and compatibility with signals in real retina. To effectively stimulate the retinal cells, we have designed a PFM circuit with limited bandwidth of output pulses and two kinds of pulse shaping circuits with digital waveform memory and pixel-level output amplitude tuner. We have fabricated a PFM photo-sensing test circuits with a standard 0.35 micrometers CMOS technology to measure its basic characteristics, and have demonstrated a large dynamic range of around 40 dB.

Paper Details

Date Published: 30 October 2001
PDF: 6 pages
Proc. SPIE 4596, Advanced Photonic Sensors and Applications II, (30 October 2001); doi: 10.1117/12.447359
Show Author Affiliations
Keiichiro Kagawa, 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)
Jun Ohta, Nara Institute of Science and Technology (Japan)
Masahiro Nunoshita, Nara Institute of Science and Technology (Japan)


Published in SPIE Proceedings Vol. 4596:
Advanced Photonic Sensors and Applications II

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