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Design of a Wireless Self-Powered Temperature Sensor for UHF Sensor Tags  

Kim, Hyun-Sik (Department of Electrical Engineering, Chungbuk National University)
Cho, Jung-Hyun (Department of Electrical Engineering, Chungbuk National University)
Kim, Shi-Ho (Department of Electrical Engineering, Chungbuk National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.44, no.10, 2007 , pp. 1-6 More about this Journal
Abstract
Wireless Self-Powered Temperature Sensor for UHF Sensor Tags which are basic device for construction of ubiquitous sensor network is proposed. The key parameters of the target specification are resolution of $0.1\;^{\circ}C$ per output bit, below 1.5 V of operating voltage and below 5 uW of power consumption during sensing operation. Temperature sensor circuit consists of PTAT current generator, band gap reference circuit generating both reference voltage and current, Sigma-Delta Converter, and Digital Counter. Simulated maximum resolution was $0.23\;^{\circ}C/bit$ in 11-bit output. The proposed temperature sensor was fabricated by using a 0.25 m CMOS process. The chip area is $0.32\;{\times}\;0.22\;mm$ and the operating frequency is 2 MHz. Measured resolution from fabricated temperature sensor was $4\;^{\circ}C/bit$ in 8-bit output for the temperature range from $10^{\circ}C$ to $80^{\circ}C$.
Keywords
Temperature Sensor; Sensor Tag; USN;
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