A Low Power Energy-Efficient Precision CMOS Temperature Sensor

被引：8
|
作者：
Wei, Rongshan [1 ]
Bao, Xiaotian [1 ]
机构：
[1] Fuzhou Univ, Coll Phys & Informat Engn, Fuzhou 350116, Fujian, Peoples R China
来源：
MICROMACHINES | 2018年 / 9卷 / 06期
基金：
中国国家自然科学基金;
关键词：
mode matching methods; temperature sensor; calibration; TO-DIGITAL-CONVERTER; 3-SIGMA INACCURACY; HIGH-ACCURACY; 125-DEGREES-C; -55-DEGREES-C;
D O I：
10.3390/mi9060257
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
This paper presents a low power, energy-efficient precision CMOS temperature sensor. The front-end circuit is based on bipolar junction transistors, and employs a pre-bias circuit and bipolar core. To reduce measurement errors arising from current ratio mismatch, a new dynamic element-matching mode is proposed, which dynamically matches all current sources in the front-end circuit. The first-order fitting and third-order fitting are used to calibrate the output results. On the basis of simulation results, the sensor achieves 3 sigma-inaccuracies of +0.18/-0.13 degrees C from -55 degrees C to +125 degrees C. Measurement results demonstrate sensor 3 sigma-inaccuracies of +/- 0.2 degrees C from 0 degrees C to +100 degrees C. The circuit is implemented in 0.18 m CMOS, and consumes 6.1 A with a 1.8 V supply voltage.
引用
收藏
页数：10
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