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Conf Proc IEEE Eng Med Biol Soc. 2012;2012:863-6. doi: 10.1109/EMBC.2012.6346068.

Programmable high-output-impedance, large-voltage compliance, microstimulator for low-voltage biomedical applications.

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Research Laboratory forIntegrated Circuits and Systems (ICAS), Electrical & Computer Engineering Department, K N Toosi University of Technology, Tehran, Iran.


This paper reports on the design of a programmable, high output impedance, large voltage compliance microstimulator for low-voltage biomedical applications. A 6-bit binary-weighted digital to analog converter (DAC) is used to generate biphasic stimulus current pulses. A compact current mirror with large output voltage compliance and high output resistance conveys the current pulses to the target tissue. Designed and simulated in a standard 0.18µm CMOS process, the microstimulator circuit is capable of delivering a maximum stimulation current of 160µA to a 10-kΩ resistive load. Operated at a 1.8-V supply voltage, the output stage exhibits a voltage compliance of 1.69V and output resistance of 160MΩ at full scale stimulus current. Layout of the core microelectrode circuit measures 25.5µm×31.5µm.

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