一种具有基极补偿技术的高速运算放大器  

A high-speed operational amplifier with base compensation technology

作　　者：李洪品 杨发顺 马奎[1,2,3] LI Hongpin;YANG Fashun;MA Kui(College of Big Data and Information Engineering,Guizhou University,Guiyang 550025,China;Engineering Research Center of Semiconductor Power Device Reliability,the Ministry of Education,Guizhou University,Guiyang 550025,China;Key Laboratory of Micro-Nano Electronics and Software Technology of Guizhou Province,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学大数据与信息工程学院,贵阳550025 [2]贵州大学半导体功率器件可靠性教育部工程研究中心,贵阳550025 [3]贵州大学贵州省微纳电子与软件技术重点实验室,贵阳550025

出　　处：《智能计算机与应用》2023年第11期142-147,共6页Intelligent Computer and Applications

基　　金：贵州大学引进人才项目(贵大人基合字(2019)63号);黔科合支撑[2023]一般283。

摘　　要：介绍了一种基于高速互补双极型工艺设计的宽带高速运算放大器。该运放输入级采用折叠式共射-共基结构能够增大输入级带宽,改进型威尔逊电流镜作为有源负载将差分输入信号转换为单端输出信号,并提高输入级差分增益;通过基极补偿技术补偿输入对管基极电流,降低输入偏置电流,提高运放精度。输出级采用双缓冲AB类输出级,能够消除交越失真,提高运放带负载能力,并为负载提供较大功率。Spectre仿真结果表明:在±15 V,25℃,1 kΩ负载电阻和10 pF负载电容条件下输入偏置电流为34.8 nA,静态电流≤8 mA,单位增益带宽365 MHz,压摆率428.1 V/μs,0.01%精度建立时间为42.3 ns。A broadband high speed operational amplifier based on high speed complementary bipolar process design is introduced.The foldable common-base structure of the input stage can increase the bandwidth of the input stage,and taken as an active load,the improved Wilson current mirror can convert the differential input signal into a single-ended output signal,and improve the differential gain of the input stage.Base compensation technology is used to compensate the input base current,reduce the input bias current and improve the accuracy of the operational amplifier.The output stage adopts double buffered Class AB output stage,which can eliminate crossover distortion,improve the load capacity of the op amp,and provide more power for the load.Spectre simulation results show that:The input bias current is 34.8 nA at±15 V,25℃,1 kΩload resistance and 10 pF load capacitor.Static current is less than 8 mA,unit gain bandwidth is 365 MHz.The swing rate is 428.1 V/μs,0.01%.The accuracy establishment time is 42.3 ns.

关 键 词：运算放大器 高速 宽带 基极电流补偿 

分 类 号：TN722.77[电子电信—电路与系统] TN431.1