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Title: An Energy Autonomous 400 MHz Active Wireless SAW Temperature Sensor Powered by Vibration Energy Harvesting
Authors: Zhu, Yao
Zheng, Yuanjin
Gao, Yuan
Made, Darmayuda I.
Sun, Chengliang
Je, Minkyu
Gu, Alex Yuandong
Keywords: Energy autonomous
Power management
SAW oscillator
Temperature sensor
Low power
Vibration energy harvest
Issue Date: 2015
Source: Zhu, Y., Zheng, Y., Gao, Y., Made, D. I., Sun, C., Je, M., et al. (2015). An Energy Autonomous 400 MHz Active Wireless SAW Temperature Sensor Powered by Vibration Energy Harvesting. IEEE Transactions on Circuits and Systems I: Regular Papers, 62(4), 976-985.
Series/Report no.: IEEE Transactions on Circuits and Systems I: Regular Papers
Abstract: An energy autonomous active wireless surface acoustic wave (SAW) temperature sensor system is presented in this paper. The proposed system adopts direct temperature to frequency conversion using a lithium niobate SAW resonator for both temperature sensing and high-Q resonator core in a cross-coupled RF oscillator. This arrangement simplifies the temperature sensor readout circuit design and reduces the overall system power consumption. A power conditioning circuit based on buck-boost converter is utilized to provide high efficiency power extraction from piezoelectric energy harvester (PEH) and dynamic system power control. The SAW resonator is fabricated in-house using a two-step lithography procedure while the RF oscillator as well as the PEH power conditioning circuit are implemented in standard 65-nm and 0.18- μm CMOS processes respectively. The measured RF transmitter output power is -15 dBm with a phase noise of -99.4 dBc/Hz at 1 kHz offset, achieving a figure of merit (FOM) of -217.6 dB. The measured temperature sensing accuracy is ±0.6 °C in -40 °C to 120 °C range. Fully powered by a vibration PEH, the proposed energy autonomous system has a self-startup voltage of 0.7 V and consumes an average power of 61.5 μW.
ISSN: 1549-8328
DOI: 10.1109/TCSI.2015.2402937
Schools: School of Electrical and Electronic Engineering 
Rights: © 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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