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1、IEEEJOURNALOFSOLID-STATECIRCUITS,VOL.34,NO.3,MARCH1999339AMultistageAmplifierTechniquewithEmbeddedFrequencyCompensationHiok-TiaqNg,StudentMember,IEEE,RamsinM.Ziazadeh,StudentMember,IEEE,andDavidJ.Allstot,Fellow,IEEEAbstractÐAnewmultistageoperationalamplifiert
2、opologypower-supplyvoltageisreducedbythescalingfactor,thenrequiresonlyN02embeddedcompensationnetworksforNgainstages.Thecompensationcircuitsdonotloadtheoutputstage,DNRconstantandnoninvertinggainstagesarenotrequiredasinpreviousmultistageapproaches.Consequentl
3、y,highgain,widebandwidth,fastslewing,andexcellentpowerefficiencyareachieved.Alow-(1)powerresistance±capacitancecompensationtechniqueassuresstabilityandfastsettlingoverprocess,voltage,andtemperaturevariations.Implementedina0.6-mn-wellCMOSprocess,aBandwidthco
4、nstant(2)single-endedthree-stageprototypedissipates6.9mWat3.0Vwith102dBgain,47MHzbandwidth,and69V/saverageslewratewith40pFload.IndexTermsÐFrequencycompensation,multistageamplifiers,(3)operationsamplifierdesign.Therefore,bothandmustbeincreasedbytomaintaincons
5、tantdynamicrangeandconstantbandwidth,respectively.I.INTRODUCTIONMoreover,sincemustbeincreasedby(becauseisSPREDICTEDbyG.Moorein1965[1],[2],MOSfield-alsoscaledby),thepowerdissipationescalatesby.FromAeffect-transistor(MOSFET)featuresizesandpower-theviewpointoft
6、echnologyscaling,thetermªlow-power,supplyvoltageshavedecreasedexponentially,enablingfastlow-voltageanalogdesignºissomewhatoxymoronic.andreliableCMOSdigitalprocessors.MoorealsopredictedThereisadditionalangstowingtothetraditionalgain-thatlinearIC'swouldnotben
7、efitasdramaticallyfromtech-bandwidthtradeoff.Usingalong-channelMOSFETmodel,nologyscaling.Infact,theemphasisonlow-voltagedigitalthevoltage-gainandunity-gainbandwidthrelationshipsarecircuitryhasmadehigh-performanceanalogdesignevermoredifficult.(4)Primaryamongke
8、yanalogsignal-processingblocksistheoperationalamplifier.Inthepast,high-gainop-ampshavebeenrealizedbycascodingdevicestogeneratehigh-output(5)impedances.Now,however,cascodingwithsub-3-Vpower-supplyvoltage
