On-chip Solid-State CMOS Compatible Micro-Supercapacitors

Andersson, Rickard; Saleem, Amin M; Desmaris, Vincent; Song, Bo; Wong, C.P.

doi:10.1109/ectc.2018.00211

Cited by 3 publications

(2 citation statements)

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“…Due to the limited capacitance of the on-chip storage capacitor, the electrical stimulation under the load showed slightly imbalanced biphasic waveforms. This limitation can be further improved by an external energy reservoir, such as a compact and integrable supercapacitor . While the current source was used here for the delivery of a fixed amount of charge, the amplitude of the current stimulation relied on the maximum value of the input waveform, which determined the on-chip voltage supply (Figure d).…”

Section: Resultsmentioning

confidence: 99%

“…This limitation can be further improved by an external energy reservoir, such as a compact and integrable supercapacitor. 36 While the current source was used here for the delivery of a fixed amount of charge, the amplitude of the current stimulation relied on the maximum value of the input waveform, which determined the on-chip voltage supply (Figure 2d). Critically, however, the stimulation ASIC was designed to accommodate a wide range of input voltages and frequencies from the PV microdevice, therefore under varying conditions of NIR illumination.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Wireless Addressable Cortical Microstimulators Powered by Near-Infrared Harvesting

et al. 2021

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Ensembles of autonomous, spatially distributed wireless stimulators can offer a versatile approach to patterned microstimulation of biological circuits such as the cortex. Here, we demonstrate the concept of a distributed, untethered, and addressable microstimulator, integrating an ultraminiaturized ASIC with a custom-designed GaAs photovoltaic (PV) microscale energy harvester, dubbed as an "optical neurograin (ONG)". An on-board Manchester-encoded near-infrared downlink delivers incident IR power and provides a synchronous clock across an ensemble of microdevices, triggering stimulus events by remote command. Each ONG has a unique device address and, when an incoming downlink bit sequence matches with this device identification (ID), the implant delivers a charge-balanced current stimulus to the target cortex. Present devices use 7-bit metal fuses fabricated during the CMOS process for their device ID, laser-scribed in post-processing, allowing in principle for a stimulator network of up to 128 nodes. We have characterized small ensembles of ONGs and shown a proof of concept of the system both on benchtop and in vivo rat rodent model.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%