材料科学
湿度
射频识别
光电子学
电容
电压
无线电频率
CMOS芯片
电容感应
半导体
电子工程
电气工程
电极
计算机科学
电信
物理
热力学
工程类
量子力学
计算机安全
作者
Fang‐Ming Deng,Yigang He,Lei Zuo,Bing Li,Wu Kehan
出处
期刊:Chinese Physics
[Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences]
日期:2014-01-01
卷期号:63 (18): 188402-188402
标识
DOI:10.7498/aps.63.188402
摘要
This paper presents a low-cost low-power humidity sensor for applications of ultra-high frequency radio frequency identification sensing tag. The humidity sensor element, based on standard SMIC 0.35 μm complementary metal-oxide-semiconductor technology, utilizes polyimide as sensing material and fabricates the interdigitated electrodes in top metal layer without any further post-processing. The humidity sensor interface, based on phase-locked loop theory, employs fully-digital architecture and achieves direct capacitance-to-digital conversion, which allows the supply voltage to be close to threshold voltage. The measurements at 25 ℃ show that the proposed humidity sensor achieves a sensitivity of 36.5 fF%RH, maximum hysteresis error of 7%, response time of 20 ms, and 2.1 μW power dissipation at 0.6 V supply voltage.
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