A 35 pJ/pulse injection-locking based UWB transmitter for wirelessly-powered RFID tags
2013 (English)In: 2013 Proceedings of the ESSCIRC (ESSCIRC), 2013, 379-382 p.Conference paper (Refereed)
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.
, European Solid-State Circuits Conference, ISSN 1930-8833
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-139111DOI: 10.1109/ESSCIRC.2013.6649152ScopusID: 2-s2.0-84891054488ISBN: 9781479906437OAI: oai:DiVA.org:kth-139111DiVA: diva2:687709
39th European Solid-State Circuits Conference, ESSCIRC 2013; Bucharest, Romania, 16-20 September 2013
QC 201401152014-01-152014-01-072016-04-12Bibliographically approved