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Single chip CMOS image sensors for a retina implant system



IEEE transactions on circuits and systems. 2, Express briefs 46 (1999), Nr.7, S.870-877
ISSN: 1057-7130
ISSN: 1549-7747
International Symposium on Circuits and Systems (ISCAS) <31, 1998, Monterey/Calif.>
Fraunhofer IMS ()
Auge; biomedical prosthesis; CMOS; CMOS image sensor; CMOS-Kamera; Ein-Chip-Kamera; flexible electrostimulator; implantation

This work describes the architecture and realization of microelectronic components for a retina implant system that will provide visual sensations to patients suffering from photoreceptor degeneration. Special circuitry has been developed for a fast single-chip CMOS image sensor system, which provides high dynamic range of more than seven decades (without any electronic or mechanical shutter) corresponding to the performance of the human eye. This image sensor system is directly coupled to a digital filter and a signal processor that compute the so-called receptive-field function for generation of the stimulation data. These external components are wireless, linked to an implanted flexible silicon multielectrode stimulator, which generates electrical signals for electrostimulation of the intact ganglion cells. All components, including additional hardware for digital signal processing and wireless data and power transmission, have been fabricated using in-house standard CMOS technology .