一种面向无源RFID的新型高精度温度传感器  

A Novel High Precision Temperature Sensor for Passive RFID Applications

作　　者：陈晖[1] 景为平[1] 

机构地区：[1]南通大学江苏省专用集成电路设计重点实验室,江苏南通226019

出　　处：《微电子学》2016年第2期239-242,246,共5页Microelectronics

基　　金：核高基重大专项资助项目(2009ZX01031-002-002);江苏省科技支撑计划(工业部分)资助项目(BE2013008-3);国产嵌入式CPU技术的研发及其SoC产业化应用资助项目

摘　　要：针对目前超低功耗温度传感器误差大的问题,运用由精确比例电流源偏置的寄生衬底PNP晶体管,采用0.18μm混合信号工艺设计了一种可集成于无源RFID标签的新型高精度温度传感器。传感器核心电路产生与绝对温度成正比的电压信号,通过新型开关电容积分器进行放大,并由改进的12位超低功耗逐次逼近模数转换器完成数字量化。仿真结果表明,单次温度转换时间为4.25ms;在1.8V工作电压下,平均电流为17.5μA;在-37℃~91℃范围内,温度误差为-0.1℃~0.43℃。For the large inaccuracy of traditional ultra-low power temperature sensor,a new type of temperature sensor integrated in passive RFID tag was designed based on accurately scaled bias currents in the parasitic substrate PNP transistors implemented in 0.18μm CMOS mixed signal process.The resulting PTAT temperature signal generated by sensor core was amplified by a novel switched-capacitor integrator,and was converted into digital codes by an improved ultra-low power 12-bit successive approximation analog-to-digital converter.The simulation results showed that the temperature single conversion cycle consumed 4.25 ms and the average current dissipation was 17.5μA at 1.8V.The inaccuracy of the sensor was -0.1℃ to 0.43℃in the range from-37 ℃ to 91 ℃.

关 键 词：温度传感器 射频识别 PNP晶体管 动态元件匹配 开关电容积分器 模数转换器 

分 类 号：TN492[电子电信—微电子学与固体电子学] TP212.1[自动化与计算机技术—检测技术与自动化装置]