TY - GEN
T1 - A differential readout circuit for tin oxide gas sensor array
AU - Guo, B.
AU - Bermak, A.
PY - 2005
Y1 - 2005
N2 - A novel differential readout circuit (DRC) for tin oxide gas sensors is proposed. The DRC consists of a differential readout unit (DRU), a voltage shifter (VS) and an instrumental amplifier. The DRU applies a constant current to drive the sensor and uses a unit-gain single stage amplifier (inverter) to generate the fully differential output, directly from the voltage drop across the sensor. By tuning the biasing current of the voltage shifter, the DRC can compensate for the sensor's baseline and its drift. The output of the DRC is simply proportional to the difference between the sensing signal and the baseline. Simulation results show that the DRC can sense and amplify 0-20MΩ sensor's resistance variation, which is often encountered in gas sensor applications. The output presents a linear dependence with the resistance variation of the sensor over the entire dynamic region. The proposed DRC provides increased signal to noise ratio over conventional single-ended voltage divider readout methods.
AB - A novel differential readout circuit (DRC) for tin oxide gas sensors is proposed. The DRC consists of a differential readout unit (DRU), a voltage shifter (VS) and an instrumental amplifier. The DRU applies a constant current to drive the sensor and uses a unit-gain single stage amplifier (inverter) to generate the fully differential output, directly from the voltage drop across the sensor. By tuning the biasing current of the voltage shifter, the DRC can compensate for the sensor's baseline and its drift. The output of the DRC is simply proportional to the difference between the sensing signal and the baseline. Simulation results show that the DRC can sense and amplify 0-20MΩ sensor's resistance variation, which is often encountered in gas sensor applications. The output presents a linear dependence with the resistance variation of the sensor over the entire dynamic region. The proposed DRC provides increased signal to noise ratio over conventional single-ended voltage divider readout methods.
UR - https://www.scopus.com/pages/publications/43549085077
U2 - 10.1109/EDSSC.2005.1635354
DO - 10.1109/EDSSC.2005.1635354
M3 - Conference contribution
AN - SCOPUS:43549085077
SN - 0780393392
SN - 9780780393394
T3 - 2005 IEEE Conference on Electron Devices and Solid-State Circuits, EDSSC
SP - 635
EP - 638
BT - 2005 IEEE Conference on Electron Devices and Solid-State Circuits, EDSSC
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2005 IEEE Conference on Electron Devices and Solid-State Circuits, EDSSC
Y2 - 19 December 2005 through 21 December 2005
ER -