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Full Passive UHF Tag With a Temperature Sensor Suitable for Human Body Temperature Monitoring

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7 Author(s)
Vaz, A. ; Dept. of Electron. & Commun., Univ. of Navarra (Tecnun), San Sebastian, Spain ; Ubarretxena, A. ; Zalbide, I. ; Pardo, D.
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A long-range UHF RF identification (RFID) sensor has been designed using a 0.35- ??m CMOS standard process. The power-optimized tag, combined with the ultralow-power temperature sensor, allows an ID and a temperature reading range of 2 m from a 2-W effective radiated power output power reader. The temperature sensor is based on a ring oscillator, where the temperature dependence of the oscillation frequency is used for thermal sensing. The temperature sensor exhibits a resolution of 0.035??C and an inaccuracy value lower than 0.1??C in the range from 35??C to 45??C after two-point calibration. The average power consumption of the temperature sensor is only 110 nW at ten conversions per second while keeping a high resolution and accuracy. These properties allow the use of the RFID as a batteryless sensor in a wireless human body temperature monitoring system.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:57 ,  Issue: 2 )