Programmable high-output-impedance, large-voltage compliance, microstimulator for low-voltage biomedical applications.
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.
Research Laboratory forIntegrated Circuits and Systems (ICAS), Electrical & Computer Engineering Department, K N Toosi University of Technology, Tehran, Iran. s.farahmand@ieee.org
Sina
S
Farahmand
Mohammad Hossein
MH
Maghami
Amir M
AM
Sodagar
D017097:Electric Impedance; D004599:Electric Stimulation Therapy / Q000295:instrumentation*; D006801:Humans; D008839:Microelectrodes