Proposal of Application of Pulsed Vision Chip for Retinal Prosthesis.
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- Ohta Jun
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8-1-1 Takayama, Ikoma, Nara 630-0101, Japan
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- Yoshida Norikatsu
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8-1-1 Takayama, Ikoma, Nara 630-0101, Japan
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- Kagawa Keiichiro
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8-1-1 Takayama, Ikoma, Nara 630-0101, Japan
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- Nunoshita Masahiro
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8-1-1 Takayama, Ikoma, Nara 630-0101, Japan
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抄録
A vision chip based on pulse frequency modulation (PFM) is proposed as a retinal prosthesis device for use in subretinal implantation. A pixel circuit of PFM has been fabricated using standard CMOS technology. A dynamic range of 40 dB is demonstrated at a low power supply voltage of 1 V. It is found that the competition between the charge current to the photodiode and the photocurrent affects the output pulse characteristics under the conditionds of low power supply voltage and strong light illumination. For in vitro and in vivo experiments, two methods of improving the PFM circuits are considered. One is controlling the pulse frequency. By adding one transistor to the PFM circuit, the output pulse frequency can be experimentally controlled by a factor of two. The other is using a biphasic output, which is required to keep a charge balance in a living body. By introducing differential circuits, the biphasic output has been confirmed by simulation.
収録刊行物
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- Japanese Journal of Applied Physics
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Japanese Journal of Applied Physics 41 (4B), 2322-2325, 2002
The Japan Society of Applied Physics
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詳細情報 詳細情報について
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- CRID
- 1390282681233190400
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- NII論文ID
- 210000051205
- 130004529542
- 110006341157
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- NII書誌ID
- AA10457675
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- ISSN
- 13474065
- 00214922
- http://id.crossref.org/issn/13474065
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- NDL書誌ID
- 6154766
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可