一种CMOS智能温度传感器前端电路的设计  

Design of a Front-End Circuit for CMOS Smart Temperature Sensors

作　　者：秦瑞[1] 沈延钊[1] 王纪民[1] 

机构地区：[1]清华大学微电子学研究所,北京100084

出　　处：《微电子学》2007年第2期286-290,共5页Microelectronics

摘　　要：设计了一种CMOS智能温度传感器的前端电路,包括温度检测电路、基准电流源和自稳零放大器。通过分析垂直衬底PNP晶体管的非理想特性,提出了相应的减小温度检测误差的方法;设计了一个对电源电压和温度变化不敏感的基准电流源,为温度检测器件提供精确的偏置电流;通过自稳零放大器对检测到的微弱电压信号进行放大。整个电路基于上华0.6μm CMOS工艺实现,采用Hspice工具进行仿真。仿真结果表明,该电路检测温度范围从-55℃到125℃,检测精度在1℃以内。A front-end circuit of CMOS smart temperature sensors is designed, which consists of temperature sensor, current reference and auto zeroing amplifier. By analyzing the nonidealities of the suhstrate PNP transistors, means to minimize their influence is presented. A current reference with low temperature and voltage sensitivity is designed, which provides bias current for the temperature sensor. The low voltage signal is amplified by the auto zeroing amplifier. The full circuits are realized using CSMC＇s 0. 6μm CMOS technology and simulated using Hspice tool. Results from simulation show that the circuit can provide a resolution of 1 ℃ from --55 ℃ to 125 ℃.

关 键 词：温度传感器 衬底PNP晶体管 基准电流源 自稳零 

分 类 号：TN47[电子电信—微电子学与固体电子学]