TY - GEN
T1 - A CMOS analog front-end interface IC for gas sensors
AU - Kim, Hyuntae
AU - Bakkaloglu, Bertan
PY - 2010
Y1 - 2010
N2 - This paper presents a gas sensor readout IC for amperometric and conductometric electrochemical sensors. The Analog Front-End (AFE) readout circuit enables tracking long term exposure to hazardous gas fumes in diesel and gasoline equipment, which may be correlated to diseases. The AFE reads out the output of eight conductometric sensor arrays and eight amperometric sensor arrays. The IC consists of a low noise potentiostat, and associated 9bit current-steering DAC for sensor stimulus, followed by the first order nested chopped ΣΔ A ADC. The conductometric sensor uses a current driven approach for extracting conductance of the sensor depending on gas concentration. The amperometric sensor uses a potentiostat to apply constant voltage to the sensors and an I/V converter to measure current out of the sensor. The core area for the AFE is 2.65×0.95 mm2. The proposed system achieves 91 dB SNR at 1.32mW quiescent power consumption per channel. With digital offset storage and nested chopping, the readout chain achieves 500 μV input referred offset.
AB - This paper presents a gas sensor readout IC for amperometric and conductometric electrochemical sensors. The Analog Front-End (AFE) readout circuit enables tracking long term exposure to hazardous gas fumes in diesel and gasoline equipment, which may be correlated to diseases. The AFE reads out the output of eight conductometric sensor arrays and eight amperometric sensor arrays. The IC consists of a low noise potentiostat, and associated 9bit current-steering DAC for sensor stimulus, followed by the first order nested chopped ΣΔ A ADC. The conductometric sensor uses a current driven approach for extracting conductance of the sensor depending on gas concentration. The amperometric sensor uses a potentiostat to apply constant voltage to the sensors and an I/V converter to measure current out of the sensor. The core area for the AFE is 2.65×0.95 mm2. The proposed system achieves 91 dB SNR at 1.32mW quiescent power consumption per channel. With digital offset storage and nested chopping, the readout chain achieves 500 μV input referred offset.
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U2 - 10.1109/CASME.2010.5706689
DO - 10.1109/CASME.2010.5706689
M3 - Conference contribution
AN - SCOPUS:79952531255
SN - 9781424499953
T3 - 2010 2nd Circuits and Systems for Medical and Environmental Applications Workshop, CASME 2010
BT - 2010 2nd Circuits and Systems for Medical and Environmental Applications Workshop, CASME 2010
T2 - 2010 2nd Circuits and Systems for Medical and Environmental Applications Workshop, CASME 2010
Y2 - 13 December 2010 through 15 December 2010
ER -