A matched biphasic microstimulator for an implant able retinal prosthetic device

Praveen R. Singh, Wentai Liu, Mohanasankar Sivaprakasam, Mark S. Humayun, James D. Weiland

研究成果: Conference article同行評審

18 引文 斯高帕斯(Scopus)


This paper describes the design and implementation of an implantable microstimulator chip designed for stimulating electrodes in a retinal prosthetic device. The chip is capable of providing biphasic current pulses up to 600μA amplitude to a maximum load of 10kΩ with a anodic/cathodic matching of 1.3%. The current source operates at low voltage headroom of 0.5V by using an active feedback setup. The gain variations for output currents are less than 3%. A 1:8 demultiplexing is used for a stimulus frequency of 50-60Hz. A variable amplification scheme is implemented to maintain a high resolution throughout the entire stimulus range. The outputs are equipped with charge cancellation mechanism to ensure safety of the tissue. Measurement results of a prototype fabricated in AMI 1.6μm bulk CMOS technology are presented.

頁(從 - 到)IV-1-IV-4
期刊Proceedings - IEEE International Symposium on Circuits and Systems
出版狀態Published - 2004
事件2004 IEEE International Symposium on Cirquits and Systems - Proceedings - Vancouver, BC, Canada
持續時間: 2004 5月 232004 5月 26

All Science Journal Classification (ASJC) codes

  • 電氣與電子工程


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