低失调二阶曲率补偿的带隙电压基准源设计  

A Low Mismatch Bandgap Voltage Reference with Second-order Curvature Compensation

作　　者：宋宇[1,2] 吴春瑜[1,2] 王绩伟[1,2] 

机构地区：[1]辽宁大学物理学院,辽宁沈阳100036 [2]辽宁省集成电路与电子系统设计联合实验室,辽宁沈阳110036

出　　处：《微电子学与计算机》2012年第7期81-84,89,共5页Microelectronics & Computer

基　　金：国家自然科学基金项目(10974075);辽宁省创新资金项目(201105570)

摘　　要：基于斩波运算放大器的曲率补偿CMOS带隙电压基准源电路,采用了折叠式的一阶放大器,较二阶结构线路简单,功耗低,版图面积小,并能很好地满足增益要求.采用二阶电流补偿进行曲率补偿,使带隙电压基准源能达到更好的温度系数,且系统稳定.应用0.5μm CMOS Spice模型进行了运算放大器和带隙电压基准源的电路仿真,输出电压为1.17V,在-20℃至120℃温度下,温度系数为4.7ppm/℃.该基准电压可根据工艺和内部电阻元件选取的不同获得不同电压值,其温度范围能够满足实际工作环境的需要.A low mismatch Curvature-Compensated CMOS bandgap reference by the mechanism of chopper modulator,we use a first-order folding amplifier,which has a simple structure,low power consumption and smaller layout area than second-order,it still has a good gain.We use second-order current compensation,make the BGR a better temperature coefficient and the system is stable.We use a standard 0.5μm CMOS process to simulate the op-amp circuit and bandgap reference circuit.The circuit delivers an output voltage of 1.17V,and achieves temperature coefficient of 4.7 ppm over-20 ℃ to 120 ℃ We can choose a different process and passive resistance to make the different reference voltage,temperature coefficient is still enough to meet the actual needs.

关 键 词：斩波技术 带隙基准 失调电压 曲率补偿 

分 类 号：TN402[电子电信—微电子学与固体电子学]