An adaptive front-end for grounded conductivity sensors in liquid-monitoring applications

Author

Jia, Qi ; Li, Xiujun ; Meijer, Gerard C M

Author_Institution

Electron. Instrum. Lab., Delft Univ. of Technol., Delft, Netherlands

fYear

2008

fDate

20-23 Oct. 2008

Firstpage

1713

Lastpage

1716

Abstract

In this paper, a novel adaptive front-end circuit for measuring liquid conductivity is proposed. To deal with the chemically active environment around the sensor electrodes, the dc component of the excitation signal is set to be zero. The proposed system is able to generate a symmetrical excitation signal with a single power supply even when one terminal of the sensor electrode is grounded. The use of an external reference conductance allows the user to adjust the system, so that the full dynamic range can be obtained, and the best signal-to-noise ratio can be achieved. The interface circuit has been designed for implementation in a 0.35 Â¿m CMOS technology.

Keywords

CMOS integrated circuits; electric sensing devices; electrical conductivity; electrical conductivity measurement; liquids; CMOS technology; adaptive front-end circuit; external reference conductance; grounded conductivity sensors; interface circuit; liquid; signal-to-noise ratio; single power supply; symmetrical excitation signal; CMOS technology; Chemical sensors; Circuits; Conductivity measurement; Dynamic range; Electrodes; Power generation; Power supplies; Sensor systems; Signal generators;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State and Integrated-Circuit Technology, 2008. ICSICT 2008. 9th International Conference on

Conference_Location

Beijing

Print_ISBN

978-1-4244-2185-5

Electronic_ISBN

978-1-4244-2186-2

Type

conf

DOI

10.1109/ICSICT.2008.4734910

Filename

4734910