NDLI: A variable range bi-phasic current stimulus driver circuitry for an implantable retinal prosthetic device

Content Provider	IEEE Xplore Digital Library
Author	Sivaprakasam, M. Wentai Liu Humayun, M.S. Weiland, J.D.
Copyright Year	1966
Abstract	This paper reports a driver circuitry to generate bi-phasic (anodic and cathodic) current pulses for stimulating the retinal layer through electrodes which is part of a retinal prosthetic device for implants in blind patients affected by retinitis pigmentosa (RP) and age-related macular degeneration (AMD). Dual voltage architecture is used to halve the number of interface leads from the chip to the stimulation sites compared to a single voltage supply. The driver circuitry is designed to deliver currents with six bit resolution for a wide range of full scale currents up to 600 /spl mu/A. To cater to the varying stimulus requirements among patients and different regions of the retina, variable gain architecture is used to achieve fine resolution even for a narrow range of stimulus. 1:8 demultiplexing feature is embedded within the output stage thus allowing one DAC for eight outputs. A novel charge cancellation circuitry with current limiting capability is implemented to discharge the electrodes for medical safety. Measurement results of a prototype chip fabricated in 1.5-/spl mu/m CMOS technology are presented.
Sponsorship	IEEE Solid-State Circuits Society IEEE Electron Devices Society IEEE Circuits and Systems Society Japan Society of Applied Physics (JSAP) IEEE Microwave Theory and Techniques Society IEEE San Francisco Section Bay Area Council Univ. PA IEEE
Starting Page	763
Ending Page	771
Page Count	9
File Size	1128208
File Format	PDF
ISSN	00189200
Volume Number	40
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Driver circuits Retina Prosthetics Voltage CMOS technology Pulse generation Pulse circuits Electrodes Implants Pigmentation retinal prosthesis Biomedical functional electrical stimulation (FES) implantable devices microstimulator
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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