A Subgigahertz UWB Transmitter With Wireless Clock Harvesting for RF-Powered Applications
2014 (English)In: IEEE Transactions on Circuits and Systems - II - Express Briefs, ISSN 1549-7747, Vol. 61, no 5, 314-318 p.Article in journal (Refereed) Published
A subgigahertz ultrawideband (UWB) transmitter (TX) with wireless clock harvesting is presented for RF-powered applications such as RF identifications and implantable devices in the 180-nm CMOS process. The proposed low-power TX consists of a harmonic injection-locked ring oscillator (ILRO), a synchronized pulse generator, and a driver stage. Through wireless injection locking, a 450-MHz carrier is extracted using the sub-harmonic of an ultrahigh frequency signal radiated by a reader. Following the ILRO, the carrier is gated and amplified to generate the UWB pulses. This approach avoids power-hungry frequency synthesis circuitry and bulky crystal reference, and it relaxes the timing synchronization between the reader and the tag. Due to aggressive duty cycling and the fast setup time (< 50 ns at an input power of -15 dBm), the proposed TX is power scalable with an energy consumption of 35 pJ/pulse. To comply with the Federal Communications Commission regulations, the maximum pulse rate is up to 5 MHz with a peak-to-peak pulse amplitude of 0.75 V and a corresponding power consumption of 175 mu W, which is favorable to RF-powered applications.
Place, publisher, year, edition, pages
2014. Vol. 61, no 5, 314-318 p.
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-147431DOI: 10.1109/TCSII.2014.2312801ISI: 000336669600006ScopusID: 2-s2.0-84901296413OAI: oai:DiVA.org:kth-147431DiVA: diva2:730745
QC 201406302014-06-302014-06-272016-04-12Bibliographically approved