Application of pulse frequency modulation photosensors to subretinal artificial retina implantation

Keiichiro Kagawa; Norikatsu Yoshida; Tetsuo Furumiya; Jun Ohta; Masahiro Nunoshita

doi:10.1117/12.447359

30 October 2001 Application of pulse frequency modulation photosensors to subretinal artificial retina implantation

Keiichiro Kagawa, Norikatsu Yoshida, Tetsuo Furumiya, Jun Ohta, Masahiro Nunoshita

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.

Citation Download Citation

Keiichiro Kagawa, Norikatsu Yoshida, Tetsuo Furumiya, Jun Ohta, and 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); https://doi.org/10.1117/12.447359

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