標題: | A Wirelessly Powered Smart Contact Lens with Reconfigurable Wide Range and Tunable Sensitivity Sensor Readout Circuitry |
作者: | Chiou, Jin-Chern Hsu, Shun-Hsi Huang, Yu-Chieh Yeh, Guan-Ting Liou, Wei-Ting Kuei, Cheng-Kai 電機工程學系 電控工程研究所 Department of Electrical and Computer Engineering Institute of Electrical and Control Engineering |
關鍵字: | capacitance-to-digital converter (CDC);capacitive sensor;soft contact lens;UHF RFID Class1 Gen2 |
公開日期: | 1-Jan-2017 |
摘要: | This study presented a wireless smart contact lens system that was composed of a reconfigurable capacitive sensor interface circuitry and wirelessly powered radio-frequency identification (RFID) addressable system for sensor control and data communication. In order to improve compliance and reduce user discomfort, a capacitive sensor was embedded on a soft contact lens of 200 mu m thickness using commercially available bio-compatible lens material and a standard manufacturing process. The results indicated that the reconfigurable sensor interface achieved sensitivity and baseline tuning up to 120 pF while consuming only 110 mu W power. The range and sensitivity tuning of the readout circuitry ensured a reliable operation with respect to sensor fabrication variations and independent calibration of the sensor baseline for individuals. The on-chip voltage scaling allowed the further extension of the detection range and prevented the implementation of large on-chip elements. The on-lens system enabled the detection of capacitive variation caused by pressure changes in the range of 2.25 to 30 mmHg and hydration level variation from a distance of 1 cm using incident power from an RFID reader at 26.5 dBm. |
URI: | http://dx.doi.org/10.3390/s17010108 http://hdl.handle.net/11536/133047 |
ISSN: | 1424-8220 |
DOI: | 10.3390/s17010108 |
期刊: | SENSORS |
Volume: | 17 |
Issue: | 1 |
起始頁: | 0 |
結束頁: | 0 |
Appears in Collections: | Articles |
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