A dual-channel wide input range interface circuit for electrochemical amperometric sensors

IEICE Electronics Express

Mingyuan Ren²  Zhichao Li¹  Min Chen¹  Yuntao Liu³ 

[1] Institute of Microelectronics of Chinese Academy of Sciences;School of Software, Harbin University of Science and Technology;College of Information and Communication Engineering, Harbin Engineering University

关键词: wide range;    electrochemical sensor;    interface circuit;    TIA;   

DOI  :  10.1587/elex.12.20150568

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(9)A wide input range, compliant with electrochemical amperometric sensors interface circuit is proposed in this paper. The interface circuit consists of a potentiostat which is fabricated on PCB board and an interface ASIC which is realized in a single chip. The ASIC employs current integrator (CI) and transimpedance amplifier (TIA) to deal with the input current in the order of nA and µA separately, achieving the advantage of wide input range and high resolution. An incremental sigma-delta ADC is employed to digitize the transferring signal to achieve the feature of one-to-one mapping between input and output. The ASIC is fabricated in 0.18 µm 1P5M mixed-signal CMOS process, has a dynamic range of 120 dB, and consumes 4.2 mA.

【 授权许可】

Unknown