https://scholars.lib.ntu.edu.tw/handle/123456789/631401
標題: | A Wireless Soil pH and Conductance Monitoring Chip Powered by Soil Microbial and Photovoltaic Energy Cells | 作者: | Lu, Ting Heng Liu, Chi Wei Wu, Chuan Yi Huang, Cong Sheng Chen, Jing Siang Chen, Ling Chia Huang, Yao Wei Ou, I. Che Lee, Sook Kuan Chen, Yen Chi Chen, Po Hung CHI-TE LIU YING-CHIH LIAO Liao, Yu Te |
關鍵字: | CMOS | energy harvesting | microbial energy cell | power-efficient | readout IC | soil monitoring | 公開日期: | 1-十二月-2022 | 出版社: | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC | 卷: | 16 | 期: | 6 | 起(迄)頁: | 1008 | 來源出版物: | IEEE Transactions on Biomedical Circuits and Systems | 摘要: | This paper presents an energy-autonomous wireless soil pH and electrical conductance measurement IC powered by soil microbial and photovoltaic energy. The chip integrates highly efficient dual-input, dual-output power management units, sensor readout circuits, a wireless receiver, and a transmitter. The design scavenges ambient energy with a maximal power point tracking mechanism while achieving a peak efficiency of 81.3% and the efficiency is more than 50% over the 0.05-14 mW load range. The sensor readout IC achieves a sensitivity of-8.8 kHz/pH and 6 kHz·m/S, a noise floor of 0.92 x 10-3 pH value, and 1.4 mS/m conductance. To avoid interference, a 433 MHz transceiver incorporates chirp modulation and on-off keying (OOK) modulation for data uplink and downlink communication. The receiver sensitivity is-80 dBm, and the output transmission power is-4 dBm. The uplink data rate is 100 kb/s using burst chirp modulation and gated Class E PA, while the downlink data rate is 10 kb/s with a self-frequency tracking mixer-first receiver. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/631401 | ISSN: | 19324545 | DOI: | 10.1109/TBCAS.2022.3222089 |
顯示於: | 化學工程學系 |
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