A 232-Channel Epiretinal Stimulator ASIC

A 232-Channel Epiretinal Stimulator ASIC

This paper presents the architecture and design of a stimulator ASIC for a visual prosthesis. The circuit employs fully wireless operation and features 232 channels with a maximum of 116 parallel stimulations. The architecture is separated into shared global functions and locally distributed stimula...

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Veröffentlicht in:IEEE journal of solid-state circuits 2007-12, Vol.42 (12), p.2946-2959
Hauptverfasser: Ortmanns, M., Rocke, A., Gehrke, M., Tiedtke, H.-J.
Format: Artikel
Sprache:eng
Schlagworte:
Application specific integrated circuits
Applied sciences
Architecture
BioMEMS
Channels
charge balancing
Circuits
current stimulator
Design. Technologies. Operation analysis. Testing
Electrical stimulation
Electronics
Electrostatic discharge
epiretinal implant
ESD protection
Exact sciences and technology
high-voltage
Implants
Integrated circuits
Neural prosthesis
neural stimulator
Prosthetics
Protection
Retina
retinal implant
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Stimulation
Stimulators
Testability
Testing
Visual
Visual prosthesis
Voltage
voltage nullor
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Beschreibung
Zusammenfassung:This paper presents the architecture and design of a stimulator ASIC for a visual prosthesis. The circuit employs fully wireless operation and features 232 channels with a maximum of 116 parallel stimulations. The architecture is separated into shared global functions and locally distributed stimulation functions. High tissue impedance of epiretinal stimulation sets the need for high-voltage output compliance, which is typically as high as 22.5 V in this implementation. For implantation-ready design, full testability has been achieved, full ESD protection was implemented, and novel safety features were realized in order to combine highly flexible operation with maximum innocuousness for the patient. The overall stimulator occupies 22 mm 2 in a 0.35 HVCMOS technology.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2007.908693