標題: A Power-efficient Bidirectional Potentiostat-based Readout IC for Wide-range Electrochemical Sensing
作者: Tsai, Jui-Hsiang
Chen, Yi-Chia
Liao, Yu-Te
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: chopper stabilization;large dynamic range;low-power design;potentiostat
公開日期: 1-Jan-2018
摘要: This paper presents a low-power electrochemical sensor readout IC with a bi-directional potentiostat for accommodating a large dynamic sensing current range. The proposed chopper stabilization potentiostat, suppressing low-frequency noise at the front end and providing stable positive and negative potentials between the working and reference electrodes for bi-directional current sensing through a switched push-pull readout stage. The digital implementation of an oscillator-based current to frequency converter and frequency counter transforms the sensing current directly into digital codes. The design is realized in a 0.18 mu m CMOS process and occupies an area of 1.3mm(2), including all passive components and pads. The proposed readout IC achieves a 0.9pA minimum detectable current in a current range of +/- 18 mu A, an R-2 linearity of 0.999, and a dynamic detectable current range of 152dB. The static power consumption of the proposed readout IC is 2.9 mu W from a 1.5V supply.
URI: http://hdl.handle.net/11536/150861
ISSN: 0271-4302
期刊: 2018 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS)
Appears in Collections:Conferences Paper