A 16-channel wireless neural interfacing SoC with RF-powered energy-replenishing adiabatic stimulation

Ha, Sohmyung; Akinin, Abraham; Park, Jiho; Kim, C.; Wang, Hui; Maier, Christoph; Cauwenberghs, Gert; Mercier, Patrick P.

doi:10.1109/vlsic.2015.7231341

Cited by 16 publications

(13 citation statements)

References 3 publications

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“…Hence, higher voltage rails of more than AE10 V and/or high-voltage processes are required typically [84]- [86], in turn this results in higher power consumption, larger silicon area, and system complexity to generate and handle high-voltage signals. Instead of maintaining a constant high-voltage power supply, some designs save power by generating a large power rail only when actively stimulating [77], [87], [88].…”

Section: Integrated Circuit Interfaces For Stimulationmentioning

confidence: 99%

“…However, the required blocking capacitance is often prohibitively large for onchip integration, and is thus inadequate for high-density and/or miniaturized implants. Instead of external capacitors, capacitive electrodes made with high-k dielectric coatings have been investigated for safe neural interfaces [88], [100], [101]. Several other techniques for better charge balancing have been demonstrated: 1) shorting electrodes to ground [102]; and 2) utilizing a discharging resistor [94], active current balancing by feedback control [103], [104], generating additional balancing current pulses by monitoring electrode voltages [105], and embedded DAC calibration [93], [106].…”

Section: Integrated Circuit Interfaces For Stimulationmentioning

confidence: 99%

“…In biological tissues, the tradeoff between coil design and tissue losses results in an optimal frequency for wireless power transmission where efficiency is maximized. For example, the inductance of coils located on miniaturized, millimeter-scale implants ranges from 10 to 100 nH [66], [88], [146], [147]. To compensate for reduced magnetic flux through the miniaturized receiving coil, the carrier frequency for wireless power transfer should be increased, often into the hundreds of megahertz to single-digit gigahertz range [66], [146]- [149].…”

Section: A Poweringmentioning

confidence: 99%

“…Hence, amplitude shift keying (ASK) has been widely employed in such IMDs [88], [179], [180], modulating the power carrier signals. For IMDs with stimulation capability, forward telemetry for closed-loop operation is typically time-multiplexed with backward telemetry.…”

Section: B Wireless Data Communicationmentioning

confidence: 99%

“…Instead of separating the electrodes and the ASIC, a promising approach that we present below is to integrate everything on a single encapsulated neural interfacing and acquisition chip (ENIAC), including electrodes, antennas for power and data telemetry, and all other circuits and components [88]. Thus, no external wires, substrates, batteries, or any other external components are required.…”

Section: A Encapsulated Neural Interfacing Acquisition Chip (Eniac)mentioning

confidence: 99%

See 4 more Smart Citations

Silicon-Integrated High-Density Electrocortical Interfaces

Akinin

Park

et al. 2017

Proc. IEEE

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Section: Integrated Circuit Interfaces For Stimulationmentioning

confidence: 99%

Section: Integrated Circuit Interfaces For Stimulationmentioning

confidence: 99%

Section: A Poweringmentioning

confidence: 99%

Section: B Wireless Data Communicationmentioning

confidence: 99%

Section: A Encapsulated Neural Interfacing Acquisition Chip (Eniac)mentioning

confidence: 99%

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Silicon-Integrated High-Density Electrocortical Interfaces

Akinin

Park

et al. 2017

Proc. IEEE

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Versatile On‐Chip Programming of Circuit Hardware for Wearable and Implantable Biomedical Microdevices

Lee,

Leung

et al. 2023

Advanced Science

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Wearable and implantable microscale electronic sensors have been developed for a range of biomedical applications. The sensors, typically millimeter size silicon microchips, are sought for multiple sensing functions but are severely constrained by size and power. To address these challenges, a hardware programmable application‐specific integrated circuit design is proposed and post‐process methodology is exemplified by the design of battery‐less wireless microchips. Specifically, both mixed‐signal and radio frequency circuits are designed by incorporating metal fuses and anti‐fuses on the top metal layer to enable programmability of any number of features in hardware of the system‐on‐chip (SoC) designs. This is accomplished in post‐foundry editing by combining laser ablation and focused ion beam processing. The programmability provided by the technique can significantly accelerate the SoC chip development process by enabling the exploration of multiple internal circuit parameters without the requirement of additional programming pads or extra power consumption. As examples, experimental results are described for sub‐millimeter size complementary metal‐oxide‐semiconductor microchips being developed for wireless electroencephalogram sensors and as implantable microstimulators for neural interfaces. The editing technique can be broadly applicable for miniaturized biomedical wearables and implants, opening up new possibilities for their expedited development and adoption in the field of smart healthcare.

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