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1、IEEETRANSACTIONSONSOLID-STATECIRCUITS,VOL.35,NO.2,FEBRUARY2000221Three-StageLargeCapacitiveLoadAmplifierwithDamping-Factor-ControlFrequencyCompensationKaNangLeung,PhilipK.T.Mok,Member,IEEE,Wing-HungKi,Member,IEEE,andJohnnyK.O.Sin,SeniorMember,IEEEAbstrac
2、t—Anoveldamping-factor-controlfrequencycompen-arenotsufficient,andtheprovidedbandwidthsarenarrowersation(DFCFC)techniqueispresentedinthispaperwithdetailedthanthebandwidthofasingle-stageamplifier.Inaddition,theoreticalanalysis.Thiscompensationtechniqueimp
3、rovesfre-tradeoffsbetweenbandwidthandotheramplifiercharacteristicsquencyresponse,transientresponse,andpowersupplyrejectionsuchassettlingtimeandpowerconsumptionarerequired.Inforamplifiers,especiallywhendrivinglargecapacitiveloads.Moreover,therequiredcompe
4、nsationcapacitorsaresmallandparticular,higherpowerconsumptionisneededtoincreasecanbeeasilyintegratedincommercialCMOSprocess.thebandwidthwhentheamplifierisrequiredtodrivealargeAmplifiersusingDFCFCandnestedMillercompensationcapacitiveloadsuchastheerrorampl
5、ifierinalinearregulator.(NMC)drivingtwocapacitiveloads,100and1000pF,wereFurthermore,bothsmall-signalandsettlingbehaviorshouldbefabricatedusinga0.8-mCMOSprocesswithVtn=0.72VandimprovedatthesametimeinordertoobtainafastamplifierVtp=0.75V.FortheDFCFCamplifi
6、erdrivinga1000-pFload,a1-MHzgain-bandwidthproduct,51phasemargin,0.33-V/s[7].Nevertheless,theabove-mentionedtopologiesaremainlyslewrate,3.54-ssettlingtime,and426-Wpowerconsumptionconcernedwiththeimprovementofthefrequencyresponse.areobtainedwithintegrat
7、edcompensationcapacitors.ComparedAnotherissuetobeconsideredistheoptimumnumberoftotheNMCamplifier,thefrequencyandtransientresponsesofgainstages.Generally,frequencycompensationtechniquesfortheDFCFCamplifierareimprovedbyoneorderofmagnitudethree-stageamplifi
8、ersareadequateforpracticalpurposessincewithinsignificantincreaseonthepowerconsumption.three-stageamplifiersmaintainagoodcompromisebetweentheIndexTerms—Dampingfactor,frequencycompensation,largevoltagegain100dB)andpowerconsu
