高精度分段曲率校正CMOS带隙基准的设计  

The Design of Precision Piecewise Curvature-Corrected CMOS Bandgap Reference

作　　者：张春茗[1] 邵志标[1] 

机构地区：[1]西安交通大学电子与信息工程学院,陕西西安710049

出　　处：《电子学报》2007年第11期2193-2197,共5页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60206003)

摘　　要：本文提出了一种新颖的分段曲率校正技术,未增加额外掩模,在标准CMOS工艺条件下就可简单实现曲率校正,使带隙基准的温度系数减少约十倍.这种方法可应用到任何一种工艺获得非线性补偿.在SMIC 0.18μm CMOS的工艺条件下,设计了一种高精度分段曲率校正全差分带隙基准.模拟结果表明输出差分参考电压为1.9997V,输出噪声电压为225nV/Hz^(1/2),电源抑制比为98dB.并在CSMS0.5μm混合信号工艺条件下,高精度分段曲率校正单端带隙基准嵌入到单片100MHz PWM控制BUCK DC-DC转换器中提供参考电压,测试结果表明参考电压为1.2501V,输出噪声电压为670nV Hz^(1/2),电源抑制比为66.7dB,温度系数为2.7ppm/℃提高了6倍.本设计采用电流形式,因而通过改变参数,可使输出差分或单端参考电压小于1V,适合低压低功耗的便携式设备.This paper presented a novel piecewise curvature-corrected technology,which can be accomplished in standard CMOS process technology without any extra masks for temperature compensation.Temperature coefficient is improved by ten Compared to the first order compensation.This novel curvature-correcting scheme can be used in almost any process technology yielding reliable temperature compensation.The additional circuitry required for this correction is compact and is easily implemented.In SMIC 0.18μm CMOS process,a precision piecewise curvature-corrected differential bandgap reference is designed.The simulation results show that differential reference is 1.9997V,total noise is 225nV,and PSRR is 98dB.Meantime,the precision piecewise curvature-corrected single-end bandgap reference implemented in CSMS 0.5μm process is embedded in a monolithic 100MHz PWM BUCK DC-DC converter as reference voltage.Experimental results show that reference voltage is 1.2501V,total noise is 670nV, PSRR is 66.7dB,and temperature coefficient is improved by six.Differential or single-end reference can be under 1V through changing parameters due to the current mode,which is adapted to low-voltage low-power portable devices.

关 键 词：曲率校正 带隙基准 低噪声 非线性补偿 微调 

分 类 号：TN4[电子电信—微电子学与固体电子学]