电源自适应Rail-to-RailCMOS运算放大器  

A Supply Voltage Self Adaptive Rail to Rail CMOS Amplifier

作　　者：程旭[1] 陈诚[1] 徐栋麟[1] 任俊彦[1] 许俊[1] 

机构地区：[1]复旦大学专用集成电路与系统国家重点实验室,上海200433

出　　处：《微电子学》2002年第5期335-339,共5页Microelectronics

摘　　要：基于 CSMC 0 .6μm标准 CMOS工艺 ,实现了一种电源自适应 Rail- to- Rail CMOS运算放大器 ,其输入级从原理上变“被动地”适应低电压为“主动地”要求低电压。当外部电源电压在 2 .1V到 3.2 V变化时 ,内部电源电压稳定在 1 .68V,最大偏差为 5 .4%。这样 ,内部电源电压自适应地稳定在“相交条件”,实现了输入级的跨导 Gm 为常数 :在整个共模 ( CM)电压变化范围内 ,输入级跨导的最大变化为 9%。Rail- to- rail输出级用两个折叠网格和 AB类反馈控制结构实现 ,使输出级的最低电源电压降到 Vgs+ 2 Vds,并使输出静态电流最小。A supply voltage self adaptive rail to rail CMOS operational amplifier is implemented with a standard 0 6 micron CMOS technology of CSMC, China According to its principle, the input stage of the op amp actively requires low voltage rather than passively adapts to low voltage as before The external supply voltage ranges from 2 1 V to 3 2 V, while stabilized internal supply voltage is 1 68 V within 5 4% of maximum variation With the internal supply adaptive to the crossing point condition, a constant input G m is achieved within 9% point to point maximum variation in the whole range of common mode (CM) input Rail to rail output stage with two folded meshes and feedback class AB control cuts the supply voltage down to V gs +2V ds and minimizes the output static current, respectively

关 键 词：电源自适应 RAIL-TO-RAIL CMOS 运算放大器 模拟集成电路 

分 类 号：TN722.7+7[电子电信—电路与系统] TN431.1