A high accuracy temperature sensor and temperature compensation algorithm embedded in TPMS

A high accuracy temperature sensor integrated in TPMS with an inaccuracy of ±1°C from -55°C to 125 °C is realized in a standard CMOS process. The errors due to finite op-amp gain, offset voltage and 1/f noise are eliminated with correlated double sampling technique. The temperature-dependent voltage...

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Bibliographic Details
Published in2012 IEEE 11th International Conference on Solid-State and Integrated Circuit Technology pp. 1 - 3
Main Authors Jianguang Chen, Zhu Zhu, Lejing Wang, Yueguo Hao, Yuhua Cheng
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2012
Subjects
Accuracy
Capacitors
Gain
Switches
Temperature distribution
Temperature measurement
Temperature sensors
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Summary:A high accuracy temperature sensor integrated in TPMS with an inaccuracy of ±1°C from -55°C to 125 °C is realized in a standard CMOS process. The errors due to finite op-amp gain, offset voltage and 1/f noise are eliminated with correlated double sampling technique. The temperature-dependent voltage is boosted by a switched capacitor low noise amplifier and digitalized with an incremental ADC of a resolution about 13bits. Furthermore, 2-bits coarse biased current trimming and 5-bits fine resistive-array trimming are applied to calibrate the process variation. The required accuracy is obtained after the calibration at single temperature point. Additionally, the second-order nonlinearity temperature compensation algorithm for piezoresistive pressure sensor is described. Finally, experimental results are provided to verify the effectiveness of the proposed topology.
ISBN:9781467324748
1467324744
DOI:10.1109/ICSICT.2012.6467778