一种高速轨到轨输出差分放大器设计  

Design of a high speed and rail-to-rail output differential amplifier

作　　者：范国亮 黄治华[1] 何峥嵘[1] 徐佳丽[1] FAN Guoliang;HUANG Zhihua;HE Zhengrong;XU Jiali(The 24th Research Institute of China Electronics Technology Group Corporation,Chongqing400060,China)

机构地区：[1]中国电子科技集团公司第二十四研究所,重庆400060

出　　处：《电子元件与材料》2022年第10期1066-1071,共6页Electronic Components And Materials

基　　金：国防基础科研计划(JCKY201924C005)。

摘　　要：随着电子系统对功耗和电源电压的要求日益严苛,传统差分输出放大器的输出幅度、速度和驱动能力等受到严重限制。针对该问题,提出了一种高速轨到轨输出差分放大器。通过采用“H”桥结构,在有限的功耗下可以实现大带宽和压摆率;采用静态电流精确可控的AB类输出级,实现了接近轨到轨的输出幅度和大输出驱动能力;采用三级放大结构实现100 dB以上的高增益;嵌套式密勒(Nested Miller)频率补偿保证了系统的稳定性,共模反馈电路则设置了合适的静态工作点保证电路可以正常工作。测试结果表明,提出的高速轨到轨输出差分放大器实现了0.5 mV量级的输入失调电压,0.2~4.8 V的输出幅度,400 MHz的-3 dB带宽和1300 V/μs的压摆率。Output swing,speed and driving capability of conventional differential output amplifiers were limited by increasing demand of power supply and voltage.To address this problem,a high-speed and rail-to-rail output differential operational amplifier was proposed.Wide bandwidth and high slew rate were achieved by“H”bridge structure.Nearly rail-to-rail output swing and high driving capability were accomplished with class AB output stage and accurately controlled quiescent current.High gain and stability were achieved with three-stage amplifier and nested miller frequency compensation.Appropriate quiescent points were set to make it operate normally by additional common-mode feedback circuits.Test results show that input offset voltage of 0.5 mV,output swing of 0.2-4.8 V,-3 dB bandwidth of 400 MHz and slew rate of 1300 V/μs can be achieved with the proposed high-speed and rail-to-rail output differential amplifier.

关 键 词：放大器 差分 轨到轨 输出幅度 速度 

分 类 号：TN432[电子电信—微电子学与固体电子学]