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Varkevisser, F. (author), Lopes Marta da Costa, T.M. (author), Serdijn, W.A. (author)Developing neuroprosthetic bioelectronic devices requires wirelessly-powered implantable stimulator systems with hundreds to thousands of output channels. Power efficiency optimization is crucial for scaling up the number of output channels. Current-mode electrical stimulation is favored for safety but is power-inefficient in conventional...conference paper 2023
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Varkevisser, F. (author), Rashidi, A. (author), Lopes Marta da Costa, T.M. (author), Giagka, Vasiliki (author), Serdijn, W.A. (author)This work proposes a guideline for designing more energy-efficient electrical stimulators by analyzing the frequency spectrum of the stimuli. It is shown that the natural low-pass characteristic of the neuron’s membrane limits the energy transfer efficiency from the stimulator to the cell. Thus, to improve the transfer efficiency, it is proposed...conference paper 2022
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Rivandi, H. (author), Ghosh, Ishaan (author), Lopes Marta da Costa, T.M. (author)New non-imaging ultrasound applications, such as ultrasound stimulation and ultrasonic power transfer, need sub-millimeter volumetric spatial resolution, electronically control of the focal spot location, high ultrasound intensity, and a tiny form factor. Satisfying these requirements demands a high-frequency phased array ultrasound transducer....conference paper 2022