Authors:
Mario A. Meza Cuevas
;
Lait Abu Saleh
;
Dietmar Schroeder
and
Wolfgang Krautschneider
Affiliation:
Hamburg University of Technology, Germany
Keyword(s):
Neurostimulation, Electrical stimulation, Stimulation waveform, Implant, Current stimulation, Dac, Current steering.
Related
Ontology
Subjects/Areas/Topics:
Biomedical Engineering
;
Biomedical Instruments and Devices
;
Brain-Computer Interfaces
;
Devices
;
Electrical Bio-Impedance
;
Human-Computer Interaction
;
Implantable Electronics
;
Low-Power Design
;
Nanotechnologies
;
Physiological Computing Systems
Abstract:
Electrical Neurostimulation has been effective in several medical therapies and also for restoring physiological, sensory and neuromuscular deficits. The rectangular pulse waveform has been used as a standard shape for neural stimulation. However, it has been shown that non-rectangular waveforms provide a more energy-efficient neural stimulation. An ASIC has been developed composed of a stimulator, capable of driving several current waveforms, and an analog channel for biosignal acquisition. The design is implemented in 130 nm / 1.2 V CMOS technology, requiring a silicon area of 0.696 mm2. Experimental results show that the stimulator can generate analog signals from a digital input of 8 bits. The output stage can drive up to ±9.8 µA, with a DNL and INL of 0.47 and 1.05 LSB, respectively. Its SFDR is 50.2 dB. And it consumes a maximum of 128.12 µW. The analog input channel presents a power consumption of 140 µW, a gain of 52.2 dB, a bandwidth of 0.5 – 1130 Hz and 10 µVrms of noise.