Circuits for a Cubic-Millimeter Energy-Autonomous Wireless Intraocular Pressure Monitor

Ghaed, Mohammad Hassan; Chen, Gregory; Haque, Razi; Wieckowski, Michael; Kim, Yejoong; Kim, Gyouho; Lee, Yoonmyung; Lee, Inhee; Fick, David; Kim, Dae-Yeon; Seok, Mingoo; Wise, K.D.; Blaauw, David; Sylvester, Dennis

doi:10.1109/tcsi.2013.2265973

Cited by 99 publications

(45 citation statements)

References 31 publications

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“…1 Battery modeling can be used to help navigate these limitations, and many different modeling approaches have been developed. 2,3 This work focuses on adapting existing modeling approaches to capture cyclic, capacitive loading (i.e.…”

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confidence: 99%

Modeling Cyclic Capacitive Loading of Thin-Film Batteries

Teichert

Oldham

2017

J. Electrochem. Soc.

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Previous modeling of thin-film batteries has primarily looked at simple discharge loads. This work examines modeling of midfrequency dynamic loads with large variation in current during repetitive loading cycles, a type of loading that is very common in microelectromechanical system (MEMS) applications. Here we show an extension of traditional modeling of thin-film batteries to account for switching and capacitive loading representing piezoelectric or electrostatic microactuation. This model captures behavior at both fast and slow timescales, including effects of short-duration, high-current spikes. We show validation of the model and introduce a cycle projection scheme that allows for over 94% reduction in numerical calculations over a full battery discharge which includes over a million cycles. © The Author(s) 2017. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. [DOI: 10.1149/2.1141702jes] All rights reserved.Manuscript submitted October 6, 2016; revised manuscript received December 2, 2016. Published January 5, 2017.Limitations of available power sources, such as batteries, place significant constraints on design of engineered systems at many scales, from vehicles to microelectromechanical systems (MEMS).1 Battery modeling can be used to help navigate these limitations, and many different modeling approaches have been developed. 2,3 This work focuses on adapting existing modeling approaches to capture cyclic, capacitive loading (i.e. repeated charging of a load that behaves approximately like a capacitor) of thin-film batteries, a loading which is very common in, for example, MEMS applications. Additionally, for small-scale systems, all-solid-state batteries are an attractive alternative to more traditional liquid electrolyte constructs in that sealing of the liquid electrolyte is avoided, 4 generally providing better size and assembly compatibility with micromachined devices. These solid electrolytes typically have lower ionic conductivities, but the effects of this are mitigated by the reduced thickness at which these thin films can be deposited.5 Various studies have looked at the different properties of various battery chemistries and configurations, [5][6][7][8][9][10][11][12] which is still a very active area of research. However, modeling of cyclic capacitive loads seems to be lacking in the literature.Understanding the implications of cyclic loading on batteries is important. There have been mixed reports on the broader loading category of intermittent loads on batteries at various scales. Several reports have indicated that loading conditions can have substantial effects on the battery output ability. Fuller et al.13 discussed different relaxation phenomena in lithium-ion insertion batteries. Feeney et al.14 recently demonstrated, on a specific primary Li-ion battery...

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confidence: 99%

Modeling Cyclic Capacitive Loading of Thin-Film Batteries

Teichert

Oldham

2017

J. Electrochem. Soc.

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“…A 1.5 mm 3 energy autonomous wireless intraocular pressure monitoring system is implemented using an integrated 0.07 mm 2 solar cell that can harvest a maximum power of 80 nW under a light irradiance of 100 mW/cm 2 (AM 1.5 sun condition) to recharge a 1 mm 2 thin-film battery to power the system. It also includes a 4.7 nJ/bit FSK radio that achieves 10 cm of transmission range, which is also used to receive wake-up signals [132]. Another version of this microsystem is also implemented by employing an integrated optical receiver to load program data and request data instead of the RF receiver, keeping optical powering and RF data transmission.…”

Section: Optical Power Transmission For Wireless Sensors and Microsysmentioning

confidence: 99%

Europe and the Future for WPT : European Contributions to Wireless Power Transfer Technology

Team¹

2017

IEEE Microwave

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“…They are widely used in diverse applications to measure environmental signals, such as pressure [2], displacement [3], humidity [4], and acceleration [5]. However, their interfacing circuits can easily dominate system power, which can be as low as few nanowatts [6], and hence energy-efficient capacitance-to-digital converters (CDCs) are required. Therefore, CDC researchers aim at obtaining high resolution with low power consumption.…”

Section: Introductionmentioning

confidence: 99%

Energy-Efficient CDCs for Millimeter Sensor Nodes

Jung

et al. 2016

Efficient Sensor Interfaces, Advanced Amplifiers and Low Power RF Systems

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Multiple energy-efficient CDCs are proposed for millimeter sensor nodes. Compared to the state-of-the-art, these CDCs achieves excellent energy efficiency, high SNR, and wide input range with a variety of techniques. These include correlated double sampling in front of a SAR ADC, incremental delta-sigma conversion with a zoom-in SAR converter, energy-efficient dual-slope conversion, and fully-digital iterative delay-chain discharge conversion.

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Circuits for a Cubic-Millimeter Energy-Autonomous Wireless Intraocular Pressure Monitor

Cited by 99 publications

References 31 publications

Modeling Cyclic Capacitive Loading of Thin-Film Batteries

Modeling Cyclic Capacitive Loading of Thin-Film Batteries

Europe and the Future for WPT : European Contributions to Wireless Power Transfer Technology

Energy-Efficient CDCs for Millimeter Sensor Nodes

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