Title :
A 5.1-μW UHF RFID tag chip integrated with sensors for wireless environmental monitoring
Author :
Cho, Namjun ; Song, Seong-Jun ; Kim, Sunyoung ; Kim, Shiho ; Yoo, Hoi-Jun
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
Abstract :
An RF-powered transponder with temperature and photo sensors is designed and fabricated for environmental monitoring. The transponder gathers power from external ISM (860-960MHz) band RF signal and senses ambient temperature and light. It contains a supply voltage generator, a temperature-compensated ring oscillator, an oversampling synchronizer, a PTAT temperature sensor and an abrupt transition buffered photo sensor. Its internal clock frequency has variation less than 7% for 1.5-V supply voltage and 90°C temperature change. The transponder occupies 0.4mm2 with 0.25-μm CMOS process and dissipates only 5.14-μW during active state.
Keywords :
CMOS integrated circuits; monitoring; optical sensors; oscillators; radiofrequency identification; temperature sensors; transponders; wireless sensor networks; 0.25 micron; 1.5 V; 5.1 muW; 5.14 muW; 860 to 960 MHz; 90 C; CMOS process; RF signal; RF-powered transponder; UHF RFID tag chip; internal clock frequency; oversampling synchronizer; photo sensors; supply voltage generator; temperature sensors; temperature-compensated ring oscillator; wireless environmental monitoring; Clocks; Frequency synchronization; Monitoring; RFID tags; Ring oscillators; Temperature sensors; Transponders; Voltage; Voltage-controlled oscillators; Wireless sensor networks;
Conference_Titel :
Solid-State Circuits Conference, 2005. ESSCIRC 2005. Proceedings of the 31st European
Print_ISBN :
0-7803-9205-1
DOI :
10.1109/ESSCIR.2005.1541614
