基于混合型ADC的高精度温度传感器研制  

A High-precision Temperature Sensor Based on a Hybrid ADC

作　　者：黄立朝 张淑慧 章宇新 孔祥艺 HUANG Lichao;ZHANG Shuhui;ZHANG Yuxin;KONG Xiangyi(The 58th Research Institute of China Electronics Technology Group Corporation,Wuri,Jiangsu,214035,CHN;School of Electronic Engineering,Xidian University,Xi'an,710071,CHN)

机构地区：[1]中国电子科技集团公司第五十八研究所,江苏无锡214035 [2]西安电子科技大学微电子学院,西安710071

出　　处：《固体电子学研究与进展》2023年第3期253-258,共6页Research & Progress of SSE

摘　　要：介绍了一种基于0.18μm CMOS工艺的高精度数字式温度传感器电路。在感温前端模块,通过利用动态匹配技术与斩波技术,并采用混合型一阶sigma-delta/SAR型ADC,在降低功耗的同时实现更高的分辨率,提高温度传感器的采样精度。经过仿真及测试验证,提出的基于混合型ADC的高精度数字式温度传感器电路,提供16 bit温度结果,应用时无需校准即可在-25~55℃的温度范围内达到±0.1℃精度。通过使能控制,极大程度地减少自发热对测温精度的影响,在1.7~5.5 V的电压范围内,电流最大值仅为5μA。在达到高精度的同时,降低了成本与功耗。A high-precision digital temperature sensor circuit based on a O.18μm CMOS process was introduced.In the temperature-sensing front-end module,by adopting dynamic matching technolo-gy and chopper technology,as well as a dopting hybrid first-order sigma-delta/SAR ADCs,the pow-er consumption was reduced,while the higher resolution was achieved and the sampling accuracy of the temperature sensor was improved.After simulation and testing,the high-precision digital tempera-ture sensor circuit based on hybrid ADC presented in this paper provides 16 bit temperature results and achieves±0.1℃accuracy over a temperature range of-25℃to 55℃without calibration.The effect of self-heating on temperature measurement accuracy is greatly reduced by enabling control,and the maximum current is only 5μA over a voltage range of 1.7 V to 5.5 V.While achieving high accuracy,the cost and power consumption are reduced.

关 键 词：温度传感器 混合型ADC sigma-delta ADC 动态元件匹配 

分 类 号：TN432[电子电信—微电子学与固体电子学]