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An UHF/UWB RFID Reader Tranceiver in 90 nm CMOS
KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

This paper presents an integrated asymmetric UHF/UWB reader transceiver in 90 nm CMOS technology for RFID applications. The reader uses UHF transmitter to power up and inventory the tags. Instead of backscattering, tag replies the reader using Ultra-wideband (UWB) pulses, allowing high throughput transmission and precise positioning. Therefore, a UWB receiver is deployed in the proposed reader for data reception and Time-of-Arrival (ToA) estimation using energy detection schemes. The transmitter delivers 160 kb/s ASK modulated data by an integrated modulator and a Digital Controlled Oscillator (DCO). The DCO has 11% tuning range ability to cover different UHF signal channels. On the UWB receiver side, the 3-5 GHz energy detection receiver supports maximum 33 Mb/s data rate in both OOK and PPM modulations. The receiver front-end provides 59 dB voltage gain and 8.5 dB noise figure (NF). Measurement results shows that the receiver achieves an input sensitivity of -79 dBm at 10 Mb/s, and the power consumption of transceiver is 21.5 mW.

Keyword [en]
RFID, wireless sensor network, impulse radio, ultra-wideband, UHF, transceiver architecture
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Information and Communication Technology
Identifiers
URN: urn:nbn:se:kth:diva-185156OAI: oai:DiVA.org:kth-185156DiVA: diva2:918717
Note

QC 20160412

Available from: 2016-04-11 Created: 2016-04-11 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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Mao, Jia
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VinnExcellence Center for Intelligence in Paper and Packaging, iPACK
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