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Sensors 2015, 15(11), 29467-29477; doi:10.3390/s151129467

Wireless Low-Power Integrated Basal-Body-Temperature Detection Systems Using Teeth Antennas in the MedRadio Band

Department of Electrical Engineering, National Cheng-Kung University, Tainan 70101, Taiwan
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Author to whom correspondence should be addressed.
Academic Editors: Hung Cao and Yu Zhao
Received: 15 July 2015 / Revised: 10 November 2015 / Accepted: 17 November 2015 / Published: 20 November 2015
(This article belongs to the Special Issue Power Schemes for Biosensors and Biomedical Devices)
View Full-Text   |   Download PDF [1983 KB, uploaded 20 November 2015]   |  

Abstract

This study proposes using wireless low power thermal sensors for basal-body-temperature detection using frequency modulated telemetry devices. A long-term monitoring sensor requires low-power circuits including a sampling circuit and oscillator. Moreover, temperature compensated technologies are necessary because the modulated frequency might have additional frequency deviations caused by the varying temperature. The temperature compensated oscillator is composed of a ring oscillator and a controlled-steering current source with temperature compensation, so the output frequency of the oscillator does not drift with temperature variations. The chip is fabricated in a standard Taiwan Semiconductor Manufacturing Company (TSMC) 0.18-μm complementary metal oxide semiconductor (CMOS) process, and the chip area is 0.9 mm2. The power consumption of the sampling amplifier is 128 µW. The power consumption of the voltage controlled oscillator (VCO) core is less than 40 µW, and the output is −3.04 dBm with a buffer stage. The output voltage of the bandgap reference circuit is 1 V. For temperature measurements, the maximum error is 0.18 °C with a standard deviation of ±0.061 °C, which is superior to the required specification of 0.1 °C. View Full-Text
Keywords: implantable fractal dental antenna; basal body temperature; temperature compensated voltage-controlled oscillator; thermal sensor implantable fractal dental antenna; basal body temperature; temperature compensated voltage-controlled oscillator; thermal sensor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yang, C.-L.; Zheng, G.-T. Wireless Low-Power Integrated Basal-Body-Temperature Detection Systems Using Teeth Antennas in the MedRadio Band. Sensors 2015, 15, 29467-29477.

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