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A 35 pJ/pulse injection-locking based UWB transmitter for wirelessly-powered RFID tags
KTH, School of Information and Communication Technology (ICT), Electronic Systems.
KTH, School of Information and Communication Technology (ICT), Electronic Systems.
KTH, School of Information and Communication Technology (ICT), Electronic Systems.
2013 (English)In: 2013 Proceedings of the ESSCIRC (ESSCIRC), 2013, 379-382 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents an energy-efficient injection-locking based UWB transmitter for RFID tags in a 0.18 μm CMOS technology. The transmitter is powered by 900 MHz UHF signals radiated by a reader wirelessly, and responds UWB pulses by locking-gating-amplifying the sub-harmonic of the UHF signal. A simple harmonic injection-locking ring oscillator (ILRO) is utilized to generate a 450 MHz carrier for sub-GHz UWB, eliminating power-hungry and complex timing components such as PLL and crystal on tags. The measurement results show that the sensitivity of the ILRO is -15 dBm under 21% locking range without any extra amplifier. Thanks to fast setup time of the ILRO, the proposed transmitter is power-scalable with 35 pJ/pulse energy consumption by duty-cycling. The amplitude of the transmitted UWB pulse is 0.75 Vpp, allowing a pulse rate up to 5 MHz under the FCC regulations. The entire power consumption of the transmitter is 175 μW, which is favorable to wirelessly-powered RFID applications.

Place, publisher, year, edition, pages
2013. 379-382 p.
Series
European Solid-State Circuits Conference, ISSN 1930-8833
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-139111DOI: 10.1109/ESSCIRC.2013.6649152Scopus ID: 2-s2.0-84891054488ISBN: 9781479906437 (print)OAI: oai:DiVA.org:kth-139111DiVA: diva2:687709
Conference
39th European Solid-State Circuits Conference, ESSCIRC 2013; Bucharest, Romania, 16-20 September 2013
Note

QC 20140115

Available from: 2014-01-15 Created: 2014-01-07 Last updated: 2016-04-12Bibliographically approved
In thesis
1. Radio and Sensor Interfaces for Energy-autonomous Wireless Sensing
Open this publication in new window or tab >>Radio and Sensor Interfaces for Energy-autonomous Wireless Sensing
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Along with rapid development of sensing and communication technology, Internet of Things (IoTs) has enabled a tremendous number of applications in health care, agriculture, and industry. As the fundamental element, the wireless sensing node, such as radio tags need to be operating under micro power level for energy autonomy. The evolution of electronics towards highly energy-efficient systems requires joint efforts in developing innovative architectures and circuit techniques. In this dissertation, we explore ultra-low power circuits and systems for micropower wireless sensing in the context of IoTs, with a special focus on radio interfaces and sensor interfaces. The system architecture of UHF/UWB asymmetric radio is introduced firstly. The active UWB radio is employed for the tag-to-reader communication while the conventional UHF radio is used to power up and inventory the tag. On the tag side, an ultra-low power, high pulse swing, and power scalable UWB transmitter is studied. On the reader side, an asymmetric UHF/UWB reader is designed. Secondly, to eliminate power-hungry frequency synthesis circuitry, an energy-efficient UWB transmitter with wireless clock harvesting is presented. The transmitter is powered by an UHF signal wirelessly and respond UWB pulses by locking-gating-amplifying the sub-harmonic of the UHF signal. 21% locking range can be achieved to prevent PVT variations with -15 dBm injected power. Finally, radio-sensing interface co-design is explored. Taking the advantage of RC readout circuit and UWB pulse generator, the sensing information is directly extracted and transmitted in the time domain, exploiting high time-domain resolution UWB pulses. It eliminates the need of ADC of the sensor interface, meanwhile, reduces the number of bits to be transmitted for energy saving. The measurement results show that the proposed system exhibits 7.7 bits ENOB with an average relative error of 0.42%.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. xviii, 93 p.
Keyword
Ultra-wideband, asymmetric UHF/UWB radio, clock harvesting, time-domain sensing, energy efficiency, Internet-of-things
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Information and Communication Technology
Identifiers
urn:nbn:se:kth:diva-184851 (URN)978-91-7595-855-2 (ISBN)
Public defence
2016-05-02, Sal/hall B, Electrum, KTH-ICT, Kista, Kista, 13:30 (English)
Opponent
Supervisors
Funder
VINNOVA
Note

QC 20160412

Available from: 2016-04-12 Created: 2016-04-05 Last updated: 2016-04-18Bibliographically approved

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  • apa
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