全差分结构低功耗CMOS运算放大器设计  

Design of low power CMOS operational amplifier with fully differential structure

作　　者：肖莹慧[1] 

机构地区：[1]中南财经政法大学武汉学院,武汉430000

出　　处：《沈阳工业大学学报》2017年第6期670-674,共5页Journal of Shenyang University of Technology

基　　金：中国博士后科学基金资助项目(2015T80797)

摘　　要：为了减小低电源电压以及短沟道效应对放大器的影响,获得低电压高增益的放大器,提出了一种基于65 nm CMOS工艺技术的全差分运算跨导放大器(OTA).采用基于增益增强技术的折叠共源共栅拓扑结构,使放大器具有轨到轨输入及大输出摆幅特性,同时兼备高速、高增益及低功耗优点.电路仿真结果表明,其直流增益为82 d B,增益带宽为477 MHz,相位裕度为59°.正常工艺角下稳定时间为10 ns,稳定精度为0.05%,而功耗仅为4.8 m W.In order to reduce the influence of lowsupply voltage and short channel effect on the amplifier and obtain an amplifier with lowvoltage and high gain,a fully differential operational transconductance amplifier（OTA） based on a 65 nm CMOS technology was proposed. A folded-cascode structure with a gain enhancement technology was adopted,which made the amplifier have a rail to rail input and large output swing characteristics and such advantages as high speed,high gain and lowpower. The circuit simulation results showthat the DC gain is 82 d B,the gain bandwidth is 477 MHz and the phase margin is59°. In addition,the settling time is 10 ns and the settling accuracy is 0. 05% under the normal process angle,while the power consumption is only 4. 8 mW.

关 键 词：CMOS集成电路 增益增强 运算跨导放大器 高速 高增益 低功耗 折叠共源共栅结构 高增益带宽 

分 类 号：TN432[电子电信—微电子学与固体电子学]