Filters








342 Hits in 6.3 sec

Toward an active contact lens: Integration of a wireless power harvesting IC

Jagdish Pandey, Yu-Te Liao, Andrew Lingley, Babak Parviz, Brian Otis
2009 2009 IEEE Biomedical Circuits and Systems Conference  
The overarching goal of an active contact lens is to integrate sensing or display functionality onto a wearable device, enabling on-lens medical monitoring and heads-up displays.  ...  We present progress toward a wirelessly-powered active contact lens comprising a transparent polymer substrate, loop antenna, power harvesting IC, and a custom micro-LED.  ...  ACKNOWLEDGMENT The authors thank Microsoft, and UW Technology Gap Innovation Fund for partial support of this project.  ... 
doi:10.1109/biocas.2009.5372069 fatcat:nqgdx5c2mvdezal5jggie3hsra

Perspective Paper—Can AC Computing Be an Alternative for Wirelessly Powered IoT Devices?

Tutu Wan, Yasha Karimi, Milutin Stanacevic, Emre Salman
2017 IEEE Embedded Systems Letters  
An alternative computing paradigm is explored in this letter with application to wirelessly powered Internet of Things (IoT) devices.  ...  Contrary to existing methods that rely on DC computing, the wirelessly harvested AC power is directly used for computation by leveraging charge-recycling theory.  ...  AC COMPUTING FOR WIRELESSLY POWERED IOT DEVICES A.  ... 
doi:10.1109/les.2017.2653058 fatcat:aleszoh25nbnfmggoatjkqp46a

A Fully Integrated RF-Powered Contact Lens With a Single Element Display

Jagdish Pandey, Yu-Te Liao, Andrew Lingley, Ramin Mirjalili, Babak Parviz, Brian P. Otis
2010 IEEE Transactions on Biomedical Circuits and Systems  
The fully integrated radio power harvesting and power management system was fabricated in a 0 13 m CMOS process with a total die area of 0 2 mm 2 .  ...  We present progress toward a wirelessly-powered active contact lens comprised of a transparent polymer substrate, loop antenna, power harvesting IC, and micro-LED.  ...  We chose a CMOS process that provides low threshold transistors for enhanced rectifier sensitivity.  ... 
doi:10.1109/tbcas.2010.2081989 pmid:23853383 fatcat:mx5tm2cuefhmtguxnwe66tz7ne

5.2-GHz RF Power Harvester in 0.18-/spl mu/m CMOS for Implantable Intraocular Pressure Monitoring

Mahmoud H. Ouda, Muhammad Arsalan, Loic Marnat, Atif Shamim, Khaled N. Salama
2013 IEEE transactions on microwave theory and techniques  
A first fully integrated 5.2 GHz CMOS based RF power harvester with an on-chip antenna is presented in this paper.  ...  Simulated efficiency of the rectifier is 42 % at -7 dBm of input power.  ...  f very low loss assumed in [12] for ocular tissue II.  ... 
doi:10.1109/tmtt.2013.2255621 fatcat:ackc4gfyovhvpgsmw6mpfvyeki

Design and Optimization of Area-Constrained Wirelessly Powered CMOS UWB SoC for Localization Applications

Jian Kang, Sujaya Rao, Patrick Chiang, Arun Natarajan
2016 IEEE transactions on microwave theory and techniques  
Key challenges for wirelessly powered operation at 10-m range include the design of high-sensitivity rectifiers and low-voltage high-efficiency UWB transmitters (TX).  ...  The rectifier, PMU, and UWB TX are integrated in 65-nm CMOS, and the rectifier demonstrates state-of-the-art 30.7-dBm sensitivity for 1-V output voltage with only 1.3 cm antenna area, representing a 2.3  ...  Hazlehurst, Oregon State University, Corvallis, OR, USA, for his work on sensor attachment to insects, Keysight for access to test equipment, and R.  ... 
doi:10.1109/tmtt.2016.2536663 fatcat:is5mnzyjz5c7tj3kbseii5qh34

A 3-$\mu\hbox{W}$ CMOS Glucose Sensor for Wireless Contact-Lens Tear Glucose Monitoring

Yu-Te Liao, Huanfen Yao, Andrew Lingley, Babak Parviz, Brian P. Otis
2012 IEEE Journal of Solid-State Circuits  
The system is wirelessly powered and achieves a measured glucose range of 0.05-1 mM with a sensitivity of 400 Hz/mM while consuming 3 W from a regulated 1.2-V supply.  ...  The IC consists of power management, readout circuitry, wireless communication interface, LED driver, and energy storage capacitors in a 0.36-mm 2 CMOS chip with no external components.  ...  In this paper, we will present a fully integrated active contact lens system for wirelessly and continuously monitoring glucose levels.  ... 
doi:10.1109/jssc.2011.2170633 fatcat:sj5u4utibnbmfismfn2naaxxqu

Breakthroughs in Microwaves: Increasing Signal Strength in Swarms of Wireless Sensors—An Interview With Dr. Aydin Babakhani

Robert H. Caverly
2021 IEEE Journal of Microwaves  
The article reviews the loss issues in the system, both path loss for the transmit-receive path as well as for wireless power transfer.  ...  The article also provides background on RF integrated circuit transceiver circuits so that the reader can more fully understand the novelty of the RF phase synchronization technique.  ...  CMOS is an ideal technology for this because you can have good functionality with small feature size devices with a low cost, allowing for a very large number of sensor chips to be deployed.  ... 
doi:10.1109/jmw.2021.3064554 fatcat:73rgovvfvzeylo4i6lkky2yltm

Far-field RF powering system for RFID and implantable devices with monolithically integrated on-chip antenna

Soheil Radiom, Majid Baghaei-Nejad, Guy Vandenbosch, Li-Rong Zheng, Georges Gielen
2010 2010 IEEE Radio Frequency Integrated Circuits Symposium  
A fully integrated far-field powering system for RFID and implantable devices with monolithically fully integrated on-chip antenna in 0.18µm CMOS is presented.  ...  The chip receives power, clock and data wirelessly through RF signal at all the three ISM bands of 915 MHz, 2.45 GHz and 5.8 GHz.  ...  CONCLUSION A fully integrated far-field powering system for RFID and implantable devices with monolithically fully integrated on-chip antenna in 0.18µm CMOS is presented.  ... 
doi:10.1109/rfic.2010.5477377 fatcat:i4y7evlcqbbufmeervbti4hama

Schottky Diode Graphene Based Sensors

A. Ashour, M. Saqr, M. AbdelKarim, A. Gamal, A. Sharaf, M. Serry
2020 International Journal on Smart Sensing and Intelligent Systems  
In this paper, we aim to demonstrate a novel scheme for integration of nanostructured semiconductor Graphene Oxide (GO) shottky diodes on flexible substrate for a wide range of sensing applications.  ...  a wide range of wearable and implantable sensing devices.  ...  Moreover, the proposed sensor operates on low power, isotropic (i.e., independent of the radiation exposure angle), easy to fabricate, can operate wirelessly, and can be seamlessly integrated in wearable  ... 
doi:10.21307/ijssis-2019-097 fatcat:d3hfwo6lebfkxf7ixhrouig2sm

RF CMOS wireless implantable microsystem for sacral roots stimulation with on-chip antenna and far-field wireless powering

F. Rodrigues, S. Gomes, P. Anacleto, J. Fernandes, P. M. Mendes
2015 2015 European Microwave Conference (EuMC)  
The proposed system includes flexible electrodes, integrated with an RF CMOS chip, which is powered by a wireless link through an efficient on-chip antenna.  ...  Also, once inside the human body, it is desirable to have a wireless link for data communication, as well for RF powering, using energy harvesting techniques or dedicated powering RF links.  ...  Nowadays, the available solutions for wirelessly power implanted devices rely mainly on inductive links to power the in-body device, which requires that the out-body device is properly very well positioned  ... 
doi:10.1109/eumc.2015.7345703 fatcat:4qhs64h7vfg2rpnxwyullejxmm

A 30mV input battery-less power management system

Jim Hui Yap, Yan Chiew Wong
2019 Bulletin of Electrical Engineering and Informatics  
Radio Frequency (RF) rectifier is utilized to act as a start-up mechanism for voltage booster and power up the low voltage closed loop power management circuit.  ...  Waste body heat is harvested through Thermoelectric energy harvesting to power up low power devices such as Wireless Body Area Network.  ...  Low dropout voltage regulator An ultra-low power CMOS Low-dropout voltage regulator is deployed to regulate the given output voltage to avoid the potentially damaging over discharge of the circuit.  ... 
doi:10.11591/eei.v8i4.1614 fatcat:g352tqou7ngfdoq3uj6r4ew5xm

Self-Biased Differential Rectifier With Enhanced Dynamic Range for Wireless Powering

Mahmoud H. Ouda, Waleed Khalil, Khaled N. Salama
2017 IEEE Transactions on Circuits and Systems - II - Express Briefs  
A prototype is designed for ultrahigh-frequency (UHF) 433-MHz radio-frequency powerharvesting applications and is implemented using a 0.18-μm CMOS technology.  ...  A sensitivity of −15.2-dBm (30-μW) input power for 1-V output voltage and a peak PCE of 65% are achieved for a 50-kΩ load.  ...  hence low dissipation loss and better sensitivity than the diode-connected device.  ... 
doi:10.1109/tcsii.2016.2591263 fatcat:vwcrykswdjcmdizrraukd6xg2a

Design of a Power Management Circuit for an Opto-Electro Stimulator

Noora Almarri, Dai Jiang, Andreas Demosthenous
2021 2021 19th IEEE International New Circuits and Systems Conference (NEWCAS)  
This paper presents the design of an integrated power management circuit for use in an implantable optoelectro stimulator.  ...  The peak power transfer efficiency for a regulated output voltage of 3.3 V is 70.7% with an output power range of 30.3 mW. The charge pump overall capacitance is 60 pF.  ...  An active rectifier with highspeed comparators has been proposed to boost the output voltage whenever it is low [5] .  ... 
doi:10.1109/newcas50681.2021.9462777 fatcat:7hfmqcx5k5gzvbvqcedne5rcr4

An RF-powered, wireless CMOS temperature sensor

F. Kocer, M.P. Flynn
2006 IEEE Sensors Journal  
The rectifier-multiplier can collect energy from a base station placed up to 18 m away. To further increase the range from the base, the device collects energy in a low power standby/charging mode.  ...  Power is recovered from a 450-MHz incident signal with the help of a low-threshold, high-efficiency, voltage rectifier-multiplier circuit.  ...  The authors thank the anonymous reviewers for their advice and suggestions.  ... 
doi:10.1109/jsen.2006.874457 fatcat:slpgbgkhrna6bgnvwa5gmgo4ry

Efficient Far-Field Radio Frequency Energy Harvesting for Passively Powered Sensor Networks

Triet Le, Karti Mayaram, Terri Fiez
2008 IEEE Journal of Solid-State Circuits  
The high voltage range achieved at low load current make it ideal for use in passively powered sensor networks.  ...  The 36-stage rectifier can rectify input voltages as low as 50 mV with a voltage gain of 6.4 and operates with received power as low as 5.5 W ( 22.6 dBm).  ...  Fully passive rectifier circuits are designed in a 0.25 m CMOS technology optimized to operate at very low received power.  ... 
doi:10.1109/jssc.2008.920318 fatcat:27reokjlmngwbchl5spohkw63y
« Previous Showing results 1 — 15 out of 342 results