Passive Digital Sensing Method and Its Implementation on Passive RFID Temperature Sensors

Zhu, Wenge; Zhang, Qi; Matlin, Mark; Chen, Yizheng; Wu, Yongji; Zhu, Xuran; Zhao, Huijuan; Pollack, Rich; Xiao, Hai

doi:10.1109/jsen.2020.3035756

Cited by 26 publications

(8 citation statements)

References 13 publications

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“…At present, NFC sensors are integrated in most smart phones and smart bracelets, so they have great development prospects and wide development space in the wearable field. Integrating NFC technology with sensing units that have the ability to detect physical and chemical signals in a single wearable sensor allows for different kinds of health detection [ 43 , 46 , 47 , 48 , 49 , 50 , 51 , 52 ].…”

Section: Wearable Nfc Sensors For Healthcarementioning

confidence: 99%

Wearable Near-Field Communication Sensors for Healthcare: Materials, Fabrication and Application

Sun

Zhao

et al. 2022

Micromachines

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The wearable device industry is on the rise, with technology applications ranging from wireless communication technologies to the Internet of Things. However, most of the wearable sensors currently on the market are expensive, rigid and bulky, leading to poor data accuracy and uncomfortable wearing experiences. Near-field communication sensors are low-cost, easy-to-manufacture wireless communication technologies that are widely used in many fields, especially in the field of wearable electronic devices. The integration of wireless communication devices and sensors exhibits tremendous potential for these wearable applications by endowing sensors with new features of wireless signal transferring and conferring radio frequency identification or near-field communication devices with a sensing function. Likewise, the development of new materials and intensive research promotes the next generation of ultra-light and soft wearable devices for healthcare. This review begins with an introduction to the different components of near-field communication, with particular emphasis on the antenna design part of near-field communication. We summarize recent advances in different wearable areas of near-field communication sensors, including structural design, material selection, and the state of the art of scenario-based development. The challenges and opportunities relating to wearable near-field communication sensors for healthcare are also discussed.

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Section: Wearable Nfc Sensors For Healthcarementioning

confidence: 99%

Wearable Near-Field Communication Sensors for Healthcare: Materials, Fabrication and Application

Sun

Zhao

et al. 2022

Micromachines

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“…The emergence of the Internet of Things (IoT) has recently triggered a significant revolution, where temperature sensors are widely employed. These temperature sensors can be used to build a wireless sensor network (WSN) for ambient temperature monitoring [1,2,3,4,5,6,7].…”

Section: Introductionmentioning

confidence: 99%

A 280nW leakage-ratio-based CMOS temperature sensor with supply/clock sensitivity suppression

2022

IEICE Electron. Express

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This paper presents a low-cost digital temperature sensor for radio frequency identification (RFID). The proposed sensor utilizes the leakage channel current ratio of different transistors with exponential temperature dependence, which results in ultra-low-power consumption and compact size. Thanks to a dual-differential scheme, it can operate without any extra assistance from a voltage regulator or accurate clock generator. The sensor is fabricated in a standard 55 nm CMOS process, and measurement results show that the proposed design achieves an inaccuracy of +0.8/−0.75 • C between −20 and 80 • C while occupying a silicon area of only 5700 µm 2 . Beneficial from the low total capacitance, the power consumption is 280 nW, and the conversion time is 37 ms.

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“…For example, the sensors mentioned in the work of Shafiq et al and Camera et al [26]- [27] are generally designed for temperature measurement. Zhu et al [28] proposes the use of a passive RFID temperature sensor using a bimetallic coil as the temperature sensing unit. Jain et al [29] proposes a high-performance, low-power temperature sensor suitable for wireless Internet of Things (IoT) devices/RFID tags.…”

Section: Introductionmentioning

confidence: 99%

A Low-Power Passive UHF Tag With High-Precision Temperature Sensor for Human Body Application

et al. 2022

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Radio frequency identification (RFID) tags are widely used in various electronic devices due to their low cost, simple structure, and convenient data reading. This topic aims to study the key technologies of ultra-high frequency (UHF) RFID tags and high-precision temperature sensors, and how to reduce the power consumption of the temperature sensor and the overall circuits while maintaining minimal loss of performance. Combined with the biomedicine, an innovative high-precision human UHF RFID chip for body temperature monitoring is designed. In this study, a ring oscillator whose output frequency is linearly related to temperature is designed and proposed as a temperature-sensing circuit by innovatively combining auxiliary calibration technology. Then, a binary counter is used to count the pulses, and the temperature is ultimately calculated. We designed a relaxation oscillator independent of voltage and current. The various types of resistors were used to offset the temperature deviation. A current mirror array calibration circuit is used to calibrate the process angle deviation of the clock circuit with a self-calibration algorithm. This study mainly contributes to reducing power consumption and improving accuracy. The total power consumption of the RF/analog front-end and temperature sensor is 7.65 μW. The measurement error of the temperature sensor in the range of 0-60 ℃ is less than ±0.1%, and the accuracy of the output frequency of the clock circuit is ±2.5%.

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Passive Digital Sensing Method and Its Implementation on Passive RFID Temperature Sensors

Cited by 26 publications

References 13 publications

Wearable Near-Field Communication Sensors for Healthcare: Materials, Fabrication and Application

Wearable Near-Field Communication Sensors for Healthcare: Materials, Fabrication and Application

A 280nW leakage-ratio-based CMOS temperature sensor with supply/clock sensitivity suppression

A Low-Power Passive UHF Tag With High-Precision Temperature Sensor for Human Body Application

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