一种基于Sigma-Delta/Cyclic ADC的温度传感器的设计  

Design of a Temperature Sensor Design Based on Sigma-Delta/Cyclic ADC

作　　者：李潇然[1] 卓恩锐 张蕾[1] 张思涵 鲍家乐 LI Xiaoran;ZHUO Enrui;ZHANG Lei;ZHANG Sihan;BAO Jiale(School of Integrated Circuits and Electronics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学集成电路与电子学院,北京100081

出　　处：《北京理工大学学报》2025年第4期429-436,共8页Transactions of Beijing Institute of Technology

基　　金：国家重点研发计划项目(2023YFB4403900,2023YFB4402400)。

摘　　要：基于CMOS 55 nm工艺,设计了一种采用Sigma-Delta/Cyclic混合架构ADC的温度传感器,其由感温模块和Sigma-Delta/Cyclic ADC构成.感温模块采用双极型晶体管(BJT)作为感温器件,并采用电流镜动态元件匹配、斩波等技术来提高感温模块精度.为实现对感温模块输出信号的精确量化,采用了Sigma-Delta/Cyclic混合架构ADC,由一阶Sigma-Delta ADC量化高位数字码,再由Cyclic ADC量化低位数字码,相比于仅采用一阶Sigma-Delta ADC量化的结构,在同等精度下至少可节省50%的转换时间.仿真结果表明,在2.5 V电源和50 kHz的时钟输入下,温度传感器在30 ms的转换时间内可实现16 bit的测温结果,在-45~125℃的温度范围内能达到最大±0.3℃的测温误差和4 m℃的测温分辨率.Being composed of a temperature sensing module and a Sigma-Delta/Cyclic ADC,a temperature sensor with a Sigma-Delta/Cyclic hybrid architecture ADC was designed based on CMOS 55 nm process.Adopting bipolar junction transistors(BJT)as temperature sensing devices,taking current mirror dynamic element matching,chopping and other technologies,the temperature sensing module was designed to improve the signal accuracy of the temperature sensing module.To achieve precise quantization of the output signal of the temperature sensing module,a Sigma-Delta/Cyclic hybrid architecture ADC was adopted.The high-order digital code was quantized by a first-order Sigma-Delta ADC,and then the low order digital code was quantized by a Cyclic ADC.The results show that compared with the structure that only used first-order Sigma-Delta ADC quantization,at least 50%of the conversion time can be saved with the Sigma-Delta/Cyclic hybrid architecture ADC.With a 2.5 V power supply and a 50 kHz clock input,the temperature sensor can achieve a 16 bit temperature measurement result within a conversion time of 30 ms.It can achieve a maximum temperature measurement error of±0.3℃and a temperature measurement resolution of 4 m℃within the temperature range of-45~125℃.

关 键 词：温度传感器 双极型晶体管 Sigma-Delta/Cyclic ADC 

分 类 号：TN432[电子电信—微电子学与固体电子学]