標題: | A Power-efficient, Bi-directional Readout Interface Circuit for Cyclic-voltammetry Electrochemical Sensors |
作者: | Chen, Yi-Chia Lu, Shao-Yung Tsai, Jui-Hsiang Liao, Yu-Te 電機工程學系 Department of Electrical and Computer Engineering |
關鍵字: | CMOS;potentiostat;chopper stabilization;large dynamic range;Cyclic Voltammetry |
公開日期: | 1-一月-2019 |
摘要: | This paper presents an electrochemical sensing front-end circuit with a cyclic voltammetry potentiostat. To accommodate a large and bidirectional current sensing range for the current-mirror based potentiostat, a constant offset current is added. With the technique of chopper-stabilization, the flicker noise of the readout circuit is successfully reduced. A charge-based oscillator is also proposed in this paper to convert the current into a frequency for further data readout. The proposed readout IC was fabricated in a 0.18 mu m, 1.2V CMOS process and the current range is -2 mu A similar to 12.2 mu A, the R-2 linearity of 0.992, with a minimum detectable current of 3.1nA. The dynamic current range is 73.2dB whereas the chip consumes 40.5 mu W at a maximum sensing current of 12.2 mu A. |
URI: | http://hdl.handle.net/11536/152556 |
ISBN: | 978-1-7281-0655-7 |
ISSN: | 2474-2724 |
期刊: | 2019 INTERNATIONAL SYMPOSIUM ON VLSI DESIGN, AUTOMATION AND TEST (VLSI-DAT) |
起始頁: | 0 |
結束頁: | 0 |
顯示於類別: | Conferences Paper |