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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...
A 0.1mm2 autonomous and digitally programmable nerve stimulation pad cell in 0.35mum HVCMOS is used in a 232-electrode retinal implant. It provides greater than plusmn15V swing at the electrode in order to supply suitable stimulation currents into large electrode impedances. Customized ESD protection is used on all electrodes. Charge balancing is applied to prevent electrolysis
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