Title :
A 127 μW exact timing reference for Wireless Sensor Networks based on injection locking
Author :
De Smedt, Valentijn ; Gielen, Georges ; Dehaene, Wim
Author_Institution :
Dept. Elektrotech., Katholieke Univ. Leuven, Heverlee, Belgium
Abstract :
A low power, fully integrated 130 nm CMOS RC oscillator for RFIDs is presented in this article. By making use of injection locking rather then a power hungry PLL, the RFID clock is locked to an external clock signal. The circuit is able to lock to a -59.3 dBm, 1.9 GHz to 2.3 GHz rf-signal which makes locking to a radiated signal received by an antenna feasible. The oscillator itself is used as a 2-fold frequency divider. This leads to an output frequency of 950 to 1150 MHz and a power consumption of 127 μW. Eight samples of the same batch were tested at different supply voltages (0.7 to 1.6 V) and temperatures (-20 to 100°C). Within the lock range, no frequency deviation was measured. The circuit was also successfully tested when driving an ultra wideband transmitter.
Keywords :
CMOS integrated circuits; RC circuits; frequency dividers; injection locked oscillators; low-power electronics; radiofrequency identification; transmitters; wireless sensor networks; 2-fold frequency divider; RF-signal; RFID clock; exact timing reference; external clock signal; frequency 1.9 GHz to 2.3 GHz; frequency 950 MHz to 1150 MHz; frequency deviation; injection locking; integrated CMOS RC oscillator; low power oscillator; power 127 muW; power consumption; power hungry PLL; radiated signal; size 130 nm; temperature -20 degC to 100 degC; ultra wideband transmitter; voltage 0.7 V to 1.6 V; wireless sensor networks; Clocks; Detectors; Injection-locked oscillators; Power demand; Transistors; Wireless sensor networks;
Conference_Titel :
ESSCIRC (ESSCIRC), 2012 Proceedings of the
Conference_Location :
Bordeaux
Print_ISBN :
978-1-4673-2212-6
Electronic_ISBN :
1930-8833
DOI :
10.1109/ESSCIRC.2012.6341335
