曲率补偿斩波带隙基准的研究与设计  

Research and Design of Bandgap Reference Using Curvature Compensation and Chopper Modulation

作　　者：刘辉 曹先国 LIU Hui;CAO Xianguo(School of Automation and Information Engineering,Sichuan University of Science and Engineering,Yibin 644000)

机构地区：[1]四川轻化工大学自动化与信息工程学院,四川宜宾644000

出　　处：《成都工业学院学报》2025年第1期37-43,共7页Journal of Chengdu Technological University

摘　　要：采用亚阈值曲率补偿和斩波调制技术分别对带隙基准的高阶温度项系数问题和运放输入失调问题进行解决。带隙基准使用SMIC.18 BCD工艺进行设计、仿真,最终完成各性能指标的仿真和验证。整体带隙电路由曲率补偿的带隙电路、斩波运放电路、陷波滤波电路、电流源和偏置电路等构成。根据实验结果显示,设计的带隙基准电压源稳定输出1.2015 V电压,电源抑制比为-80 dB,曲率补偿后带隙基准电压在-40~125℃的温度范围内的温漂系数为6.145×10^(-6)/℃。经过斩波调制,带隙电路的运放输入失调电压减小、失配情况得到改善。这种温度补偿带斩波的带隙基准适合应用在需要低温漂和低输入失调参考电压的电路系统之中。Sub-threshold curvature compensation and chopper modulation techniques were used to solve the high-order temperature coefficient problem of bandgap reference and the input offset problem of operational amplifier respectively.The bandgap reference was designed and simulated by SMIC.18 BCD process,and finally the simulation and verification of each performance index were completed.The whole bandgap circuit was composed of curvature-compensated bandgap circuit,a chopper operational amplifier circuit,a notch filter circuit,a current source,and a bias circuit,etc.According to the experimental results,the designed bandgap voltage reference stably outputs 1.2015 V,and the power supply rejection ratio is -80 dB.After curvature compensation,the bandgap voltage reference has a temperature drift coefficient of 6.145 ppm/℃ in the temperature range of -40-125℃.After chopper modulation,the input offset voltage of the operational amplifier in the bandgap circuit is reduced and the mismatch is improved.This temperature compensated bandgap reference with chopper is suitable for the circuit system that needs low temperature drift and low input offset reference voltage.

关 键 词：曲率补偿 斩波调制 低温漂 失调电压 

分 类 号：TN433[电子电信—微电子学与固体电子学]