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KMID : 1144120220120030285
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Biomedical Engineering Letters
2022 Volume.12 No. 3 p.285 ~ p.293
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MCU-less biphasic electrical stimulation circuit for miniaturized neuromodulator
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Das Himshekhar
Park Hangue
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Abstract
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A standalone neuro-stimulator circuit without a need of microcontroller (MCU) is presented. The neuro-stimulator circuit has a capability to produce a biphasic electrical stimulus with programmable pulse width and train duration. The proposed hardware system consists of commercial-off-the-shelf (COTS) components: a comparator to recognize triggering events and generate on/off signal for a variable train duration, a programmable timer to generate oscillatory signal with a fixed frequency and a variable pulse width, and a differentiator to convert monophasic pulses to biphasic pulses. The differentiator also works as a current driver having current drive capability of up to 40 mA. The proposed MCU-less biphasic electrical neuro-stimulator successfully generated biphasic stimuli with variable pulse widths from 400 μs to 5 ms and train durations from 35 to 55% of cycle duration. It works with fixed parameters programmed at the beginning, and does not need continuous MCU input. Therefore, the proposed standalone neuro-stimulator circuit has a potential to decrease power and area consumption and minimize the size of the neuro-stimulator system.
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KEYWORD
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Standalone stimulator, MCU-less, Digitally programmable, Neuro-stimulator, Power efficient
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