30 October 2001 Application of pulse frequency modulation photosensors to subretinal artificial retina implantation
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Proceedings Volume 4596, Advanced Photonic Sensors and Applications II; (2001) https://doi.org/10.1117/12.447359
Event: International Symposium on Photonics and Applications, 2001, Singapore, Singapore
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.
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Keiichiro Kagawa, Keiichiro Kagawa, Norikatsu Yoshida, Norikatsu Yoshida, Tetsuo Furumiya, Tetsuo Furumiya, Jun Ohta, Jun Ohta, Masahiro Nunoshita, Masahiro Nunoshita, } "Application of pulse frequency modulation photosensors to subretinal artificial retina implantation", Proc. SPIE 4596, Advanced Photonic Sensors and Applications II, (30 October 2001); doi: 10.1117/12.447359; https://doi.org/10.1117/12.447359
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