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A Dual-Mode Neural Stimulator Capable of Delivering Constant Current in Current-Mode and High Stimulus Charge in Semi-Voltage-Mode

Liu, XA; Demosthenous, A; Donaldson, N; (2010) A Dual-Mode Neural Stimulator Capable of Delivering Constant Current in Current-Mode and High Stimulus Charge in Semi-Voltage-Mode. In: 2010 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS. (pp. 2075 - 2078). IEEE

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Abstract

We propose a novel dual-mode neural stimulator circuit. For stimulation requiring small or medium amount of charge, the stimulator supplies a constant current to the stimulation load in the same way as any standard current-mode stimulator. For high-charge stimulation applications, the stimulator supplies a variable stimulus current, depending on the voltage available across the current generator circuit. By adjusting the bias current accordingly, the stimulator maintains a high output impedance, independent of the stimulus current and the load voltage at the time. The total stimulus charge from the proposed stimulator is theoretically as high as voltage-mode stimulators. Simulated results using a 0.6-mu m CMOS process are presented. At low stimulus current, the output impedance of the proposed stimulator circuit is at least six times higher than a conventional current-mode generator with constant bias current.

Type:Proceedings paper
Title:A Dual-Mode Neural Stimulator Capable of Delivering Constant Current in Current-Mode and High Stimulus Charge in Semi-Voltage-Mode
Event:International Symposium on Circuits and Systems Nano-Bio Circuit Fabrics and Systems (ISCAS 2010)
Location:Paris, FRANCE
Dates:2010-05-30 - 2010-06-02
ISBN-13:978-1-4244-5309-2
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering
UCL > School of BEAMS > Faculty of Engineering Science > Medical Physics and Bioengineering

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