DocumentCode :
2921957
Title :
An 0.18μm CMOS electrochemical sensor readout IC for exhaust gas monitoring
Author :
Kim, Hyuntae ; Bakkaloglu, Bertan
Author_Institution :
Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ, USA
fYear :
2009
fDate :
12-17 July 2009
Firstpage :
324
Lastpage :
327
Abstract :
A fully integrated 8-channel gas readout analog front-end IC is presented. The IC enables detection and identification of harmful environmental pollutants in exhaust gas fumes for extended periods, which in turn helps with correlating different pollutants with several illnesses. The system can read out an array of eight conductometric and amperometric electrochemical sensors while multiplexing analog-front-end circuitry to reduce die size. The IC consists of a low noise front-end and low DC offset, multiplexed ADC. The conductometric sensor uses a novel current steering approach for extracting impedance of the sensor. To reduce 1/f noise and DC offset voltage, a nested-chopper stabilized ADC is used. The detection analog front-end achieves 67.2 dB SNR at 1.57 mW quiescent power consumption per channel, enabling a chemical detection sensitivity of 1 ppm in volume.
Keywords :
1/f noise; CMOS analogue integrated circuits; amperometric sensors; gas sensors; 1/f noise; 8-channel gas readout analog front-end IC; CMOS electrochemical sensor; amperometric electrochemical sensors; analog-front-end circuitry; conductometric electrochemical sensors; exhaust gas fumes; exhaust gas monitoring; nested-chopper stabilized ADC; Amperometric sensors; Analog integrated circuits; CMOS integrated circuits; Chemical sensors; Gas detectors; Integrated circuit noise; Monitoring; Pollution; Sensor arrays; Sensor systems;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Research in Microelectronics and Electronics, 2009. PRIME 2009. Ph.D.
Conference_Location :
Cork
Print_ISBN :
978-1-4244-3733-7
Electronic_ISBN :
978-1-4244-3734-4
Type :
conf
DOI :
10.1109/RME.2009.5201365
Filename :
5201365
Link To Document :
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