Yeh, Yung HuaYung HuaYehLiu, Wei ChengWei ChengLiuLin, Yi JieYi JieLinChou, Yu SiangYu SiangChouHuang, Yu ChiaoYu ChiaoHuangChang, Min HuaMin HuaChangLin, I. TeI. TeLinChen, Yen ChiYen ChiChenYING-CHIH LIAOLiao, Yu TeYu TeLiao2023-11-152023-11-152023-01-01979835030420619308833https://scholars.lib.ntu.edu.tw/handle/123456789/637143This paper presents an electrical impedance spectroscopy (EIS) system-on-chip with a fractal root textile sensor for rapid sweat collection followed by sodium ion ( N a+) concentration and sweat flow rate analysis. The proposed design achieves an impedance resolution of 8.1 mΩH z at a sweeping frequency of up to 30 kHz and an output current of up to 100 μ A. The total harmonic distortion is less than 1%. The maximum detectable load impedance is 14 kΩ, while the total power consumption is 768 μ W. The proposed textile sensor and readout IC allow a N a+ concentration sensitivity of 2.5 code/mM and a noise floor of The chip achieves a sensitivity of 2.5 code/mM and a noise floor of 0.476 μ MH z.concentration | electrochemical impedance spectroscopy | fractal root textile sensor | sweat flow rate[SDGs]SDG3[SDGs]SDG7conference paper10.1109/ESSCIRC59616.2023.102687422-s2.0-85175245632https://api.elsevier.com/content/abstract/scopus_id/85175245632