Journal ArticleDOI
A Wireless Sensor Readout System—Circuit Concept, Simulation, and Accuracy
R. Nopper,R. Has,Leonhard Reindl +2 more
TLDR
In this paper, the authors presented an electronic readout system for wireless passive sensors based on inductively coupled LC resonant circuits, which consists of a reader coil, an analog front-end circuit, and a digital signal processing unit.Abstract:
In this paper, we present an electronic readout system for wireless passive sensors based on inductively coupled LC resonant circuits. The proposed system consists of a reader coil inductively coupled to the sensor circuit, an analog frontend circuit, and a digital signal processing unit. The analog frontend circuit generates a dc voltage representing the sensor resonance curve. The frequency of the reader coil driving signal is continuously readjusted by the digital signal processing unit. Based on analytical calculation and system simulation, we derive a model for the achievable accuracy of the overall sensor and readout system. The accuracy is limited by noise and systematic errors due to the measurement principle. We show how to design the digital signal processing system for optimal insensitivity to voltage noise. The noise sensitivity of the measurement system is inversely proportional to the square of the quality factor of the LC sensor. This means that minimizing the losses of the sensor is of crucial importance to obtain a wireless measurement system with a high range and a good insensitivity to noise. Subsequently, we outline an approach to calculate the sensor resonance frequency, quality factor, and inductive coupling factor from the available voltage signals in the signal processing unit using linear fitting functions. The accuracy of our approach is exemplified by a system simulation for typical sensor parameters. For the system studied, we show that the relative linearization error of the sensor resonance frequency measurement is below 0.02%. Taking the general models presented for both the noise sensitivity and linearization error into account, it is possible to estimate the maximum distance and accuracy for any wireless sensor system based on an inductively coupled LC resonator.read more
Citations
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Journal ArticleDOI
Continuous wireless pressure monitoring and mapping with ultra-small passive sensors for health monitoring and critical care
Lisa Y. Chen,Benjamin C. K. Tee,Alex Chortos,Gregor Schwartz,Victor Tse,Victor Tse,Darren J. Lipomi,H.-S. Philip Wong,Michael V. McConnell,Zhenan Bao +9 more
TL;DR: A wireless, real-time pressure monitoring system with passive, flexible, millimetre-scale sensors, scaled down to unprecedented dimensions of 1 × 1 × 0.1 cubic millimeters is reported, which has broader applications in continuous wireless monitoring of multiple physiological parameters for biomedical research and patient care.
Journal ArticleDOI
Materials and Designs for Wireless Epidermal Sensors of Hydration and Strain
Xian Huang,Yuhao Liu,Huanyu Cheng,Woo Jung Shin,Jonathan A. Fan,Zhuangjian Liu,Ching Jui Lu,Gil Woo Kong,Kaile Chen,Dwipayan Patnaik,Sang Heon Lee,Sami Hage-Ali,Yonggang Huang,John A. Rogers +13 more
TL;DR: In this paper, an ultrathin, stretchable class of device that is capable of laminating onto the surface of the skin, for wireless determination of dielectric and surface strain properties is presented.
Journal ArticleDOI
Enhanced Sensing and Nondegraded Thermal Noise Performance Based on PT-Symmetric Electronic Circuits with a Sixth-Order Exceptional Point.
TL;DR: This work proposes a parity-time (PT)-symmetric sensing circuit bearing a sixth-order exceptional point (EP) that offers combined enhanced sensitivity, improved resolution and nondegraded thermal noise performance, showing an exciting prospect for next-generation sensing technologies.
Journal ArticleDOI
Wireless LTCC-based capacitive pressure sensor for harsh environment
Jijun Xiong,Ying Li,Yingping Hong,Binzhen Zhang,Tianhong Cui,Qiulin Tan,Shijun Zheng,Ting Liang +7 more
TL;DR: In this article, a wireless capacitive pressure sensor based on LTCC (low temperature co-fired ceramic) technology is demonstrated and discussed, where the design, fabrication, and measurement of the sensor is demonstrated.
Journal ArticleDOI
A Wireless Passive Pressure Microsensor Fabricated in HTCC MEMS Technology for Harsh Environments
Qiulin Tan,Kang Hao,Jijun Xiong,Li Qin,Wendong Zhang,Chen Li,Ding Liqiong,Xiansheng Zhang,Mingliang Yang +8 more
TL;DR: A wireless passive high-temperature pressure sensor without evacuation channel fabricated in high-Temperature co-fired ceramics (HTCC) technology is proposed and the properties of the HTCC material ensure the sensor can be applied in harsh environments.
References
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Book
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TL;DR: The analysis and design techniques of CMOS integrated circuits that practicing engineers need to master to succeed can be found in this article, where the authors describe the thought process behind each circuit topology, but also consider the rationale behind each modification.
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A Wireless, Passive Sensor for Quantifying Packaged Food Quality.
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Journal ArticleDOI
Wireless Readout of Passive LC Sensors
TL;DR: It is shown that, due to fundamental system limitations, the formerly reported circuit concepts are not applicable if the distance between the sensor and the readout electronic circuit becomes too small, resulting in large coupling coefficients.