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Type of Document	Master's Thesis
Author	Singh, Praveen Rajan,
URN	etd-01062003-225257
Title	Micro-stimulator design for Retinal Prostheses
Degree	Master of Science
Graduate Program	Electrical Engineering
Advisory Committee	Advisor Name Title Wentai Liu Committee Chair Gianluca Lazzi Committee Member Veena Misra Committee Member
Keywords	charge neutrality discharge demultiplexing low power prosthesis prostheses retina DAC current mirror stimulator retinal
Date of Defense	2002-12-06
Availability	unrestricted
Abstract The purpose of this research is to design an integrated circuit (IC) to stimulate retina. The IC will be able to generate electrical stimulus specified by medical researchers. The IC is to be low power and low area, as it has to be implanted inside the eye. Specified area goal is to provide 1000 outputs in 5mm x 5mm implementation. Analysis is done to understand and explain the theory for power reduction. To provide large number of stimulus outputs, improvements in the previous design have been made. A number of circuits have been proposed to attain better performance. New circuit designs include active feedback output stage, design in advance process technology (TSMC 0.35 µm), variable power supply, better linearity, charge cancellation, variable output range and DAC. Layouts have been made to meet the area goals. A test chip was fabricated in AMI 1.6 µm. Measurement results have been found to be as predicted.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access    etd.pdf 2.28 Mb 00:10:34 00:05:26 00:04:45 00:02:22 00:00:12