一种采用增益增强技术的全差分运放设计和实现  

Design and Implementation of a Fully Differential Operational Amplifier with Gain-Boosting Technique

作　　者：成东波[1] 孙玲玲[1] 洪慧[1] 韩健[1] 

机构地区：[1]杭州电子科技大学射频电路与系统教育部重点实验室,杭州310018

出　　处：《电子器件》2010年第6期704-707,共4页Chinese Journal of Electron Devices

基　　金：国家自然科学基金资助项目(Y1090877);长三角科技合作项目资助(2008C16017)

摘　　要：设计了一种采用增益增强技术并带有共模反馈的全差分运算放大器。该运算放大器主要由三个折叠式共源共栅结构的运放、一个偏置电路和一个共模反馈电路组成。运算放大器采用chartered0.35μmCMOS工艺实现,仿真结果表明运放开环增益为106.8dB,单位增益带宽为58MHz,相位裕度为79°(负载Cload=1pF)。对流片运放进行测试和分析,运算放大器测试指标和仿真指标基本接近,较好达到预先的设计要求。This paper discusses a fully differential operational amplifier with gain-boosting and CMFB techniques.This OAP is constructed by three parts：a folded-cascode amplifier,a biasing circuit and a CMFB circuit.When using chartered 0.35 μm process and with its load of 1 pF capacitance,simulation result shows,its open-loop gain is 106.8 dB,unity gain bandwidth is 58 MHz and phase margin is 79°.After testing and analyzing the MPW chip,it can be find that its test results are approximate to simulations results.Thus,this amplifier achieves its design performance in general.

关 键 词：增益增强技术 全差分运放 共模反馈 折叠式共源共栅 

分 类 号：TN4[电子电信—微电子学与固体电子学]