适用于全差分运算放大器的两级共模反馈结构

41220114MicroelectronicsVol.41,No.2Apr.2011:20100514;:20100805:(200806141100);(8452840301001693)尹浩1,陈必江1,李靖1,杜翎1,汤川洋1,于奇1,宁宁1,邓春健2(1.,610054;2.,528402):针对两级全差分运算放大器对输入级和输出级不同的性能要求,设计了连续时间共模反馈电路和开关电容共模反馈电路,使运放在稳定电路直流工作点的同时提高输出摆幅基于0.13mCMOS混合信号工艺对电路进行仿真,结果表明,该运放两级共模反馈瞬态输出的波动范围分别为1.06mV和2.21mV,在2.5V电源电压下具有91.6dB直流开环增益,负载电容为1.5pF时单位增益带宽为1.163GHz:运算放大器;连续时间共模反馈;开关电容共模反馈:TN432:A:10043365(2011)02017204TwoStageCommonModeFeedbackStructuresforFullyDifferentialOperationalAmplifierYINHao1,CHENBijiang1,LIJing1,DULing1,TANGChuanyang1,YUQi1,NINGNing1,DENGChunjian2(1.StateKeyLab.ofElectronicThinFilmsandIntegratedDevices,UniversityofElectronicScience&TechnologyofChina,Chengdu610054,P.R.China;2.ZhongshanInstitute,UniversityofElectronicScience&TechnologyofChina,Zhongshan,Guangdong528402,P.R.China)Abstract:Fordifferentrequirementsofinputandoutputstagesin2stagefullydifferentialoperationalamplifier(opamp),continuoustimecommonmodefeedbackcircuitandswitchedcapacitorcommonmodefeedback(SCCMFB)circuitweredesigned,whichenlargedoutputswingwhilekeepingDCvoltagestableatnormaloperatingpoint.Resultsfromsimulationbasedon0.13mCMOSmixedsignalprocessshowedthatthecontinuoustimeCMFBandSCCMFBhadatransientoutputof1.06mVand2.21mV,respectively,andtheopamphadaDCgainof91.6dB,aunitygainfrequencyof1.163GHzwith1.5pFloadcapacitanceat2.5V.Keywords:Operationalamplifier;ContinuoustimeCMFB;SCCMFBEEACC:2570D1,,,,[1],,[24,8,9],,21,M1M2NMOS,M3M4,M5~M8,,,MOS5,,,,,[5]1Fig.1Twostagefullydifferentialoperationalamplifier,[6],2.1,,,,,[7],2(a),2(b)2(a),,Vout,cmVout+Vout,,McE3=2Mc3=2Mc4(1)McE6=2Mc6=2Mc7(2),,Mc1Mc2,Mc1Mc2:Iout=2Iref(3)WLMc1WLMc2=WLMcE3WLMc5=2(4)(3)(4),VGScE3-VthcE3VGSc5-Vthc5=2IoutnCoxWLcE32IrefnCoxWLc5=1(5)(5):(VGS)cE3=(VGS)c5(6)Mc1Mc2,(VS)cE3=(VS)c5(7)(6)(7):(VG)cE3=(VG)c5(8)Vout,cm=Vctrl(9),VctrlVout,cm,Mc5:Vctrl=2Ic5nCoxWLc51+c5VDSc5+VSc5+Vthc5(10),MOS,McE3Mc5,,VctrlVout,cm,2.2,[8],33,Vout+Vout,Vcmfb2,Vcm,ref,1732:Vbias,dummy;12,32,32;CC1CC2,CS1CS2,,CC1=CC2,CS1=CS221,[9],:Q1=Vcm,ref-VbiasCs1+Cs2+Vout+-Vcmfb2CC1+Vout-Vcmfb2CC2(11),12,:Q2=Vout+-Vcmfb2CS1+CC1+Vout-Vcmfb2CS2+CC2(12)Q1=Q2,:Vcmfb2=Vout+CS1+VoutCS22CS1+CS2-Vcm,ref-Vbias(13)CS1=CS2,(13),:Vcmfb2=Vout++Vout2-Vcm,ref+Vbias(14)(14),,,VbiasVcmfb23Fig.3SCCMFBoftheoutputstage32.5V0.13mCMOS,BSIM3(V3.24),1.5pF,EDA4(a)(b),1.06mV2.21mV,,52.5V91.6dB1.163GHz,46,,4CMOS174:2011,,2.5V0.13mCMOS,BSIM3(V3.24),EDA,,,91.6dB,1.5pF,1.163GHz,46:[1]DUQUECARRILLOJF.ControlofthecommonmodecomponentinCMOScontinuoustimefullydifferentialsignalprocessing[J].AnaIntegrandSignProcess,1993,4(2):131140.[2]CASTELLOR,GRAYPR.Ahighperformancemicropowerswitchedcapacitorfilter[J].IEEEJSolStaCirc,1985,20(6):11221132.[3]HERNANDEZGARDUNOD,SILVAMARTINEZJ.Continuoustimecommonmodefeedbackforhighspeedswitchedcapacitornetworks[J].IEEEJSolStaCirc,2005,40(8):16101617.[4]LAHL,CHOMAJ,DRAPERJ.Acontinuoustimecommonmodefeedbackcircuit(CMFB)forhighimpedancecurrentmodeapplications[J].IEEETransCircandSystII:AnaandDigSignProcess,2000,4(47):363369.[5]GULATIK,LEEHS.AhighswingCMOStelescopicoperationalamplifier[J].IEEEJSolStaCirc,1998,33(12):20102019.[6]AHMADIMM.Anewmodelingandoptimizationofgainboostedcascodeamplifierforhighspeedandlowvoltageapplications[J].IEEETransCircandSystII:ExpressBriefs,2006,53(3):169173.[7]CARRILLOJM,AUSINJL,DUQUECARRILLOJF.CMOScontinuoustimeCMFBcircuitwithimprovedlinearity[C]18thEuropConfCircTheoandDes.Seville,Spain.2007:4043.[8]DAOUDH,BENNOURS,BENSALEMS,etal.LowpowerSCCMFBfoldedcascodeOTAoptimization[C]IEEEIntConfElec,CircandSyst.StJulien's,Malta.2008:570573.[9]OJASC,CARLEYLR.Analysisofswitchedcapacitorcommonmodefeedbackcircuit[J].IEEETransCircandSystII:AnaandDigSignProcess,2003,50(12):906917.:(1986),男(汉族),河北行唐人,硕士研究生,主要从事模数混合信号集成电路的研究(上接第171页)PWM700VBCD,,:[1],.DC/DC[J].,2008,10:1617,21.[2],,.DCDC[J].,2009,29(3):179182.[3],,,.[J].,2008,28(2):293298.[4],,,.PWM[J].,2009,32(3):583585.[5],,.CMOS[J].,2006,36(3):377380.[6],,,.PWMDCDC[J].,2006,23(6):229232.:(1984),女(汉族),河南平顶山人,硕士研究生,主要从事模拟集成电路与功率集成电路的研究设计(1964),男(汉族),四川成都人,教授,博士生导师,主要从事功率半导体技术电源管理集成电路及专用集成电路的研究设计1752: