Title :
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
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 ¿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;
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
DOI :
10.1109/ICSICT.2008.4734910
