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1、26IEEETRANSACTIONSONSOLID-STATECIRCUITS,VOL.35,NO.1,JANUARY2000ActiveCapacitorMultiplierinMiller-CompensatedCircuitsGabrielA.Rincon-Mora,Member,IEEEAbstract—Atechniqueispresentedwherebythecompen-satingcapacitorofaninternallycompensatedlinearregulator,Miller-compensatedtwo-stageamplifier,iseff
2、ectivelymultiplied.Increasingthecapacitancewithacurrent-modemultiplierallowsthecircuittooccupylesssiliconareaandtomoreeffectivelydrivecapacitiveloads.Reducingphysicalarearequirementswhileproducingthesameorperhapsbetterperformanceisespeciallyusefulincomplexsystemswheremost,ifnotall,functionsar
3、eintegratedontoasingleintegratedcircuitDieareainsuchsystemsFig.1.Two-stageMiller-compensatedamplifier.isaluxury.Theincreasingdemandformobilebattery-operateddevicesisadrivingforcetowardhigherintegration.TheenhancedMiller-compensationtechniquedevelopedinthispaperhelpslikearesistor.Asaresult,the
4、outputpoleiseffectivelyenablehigherintegrationwhilebeingreadilyapplicabletoanymovedtowardhigherfrequenciesprocesstechnology,beitCMOS,bipolar,orbiCMOS.Further-more,thetechniqueapplies,ingeneral,toamplifiercircuitsin(2)feedbackconfiguration.Experimentally,theintegratedlinearregulator(fabricated
5、ina1-mmbiCMOSprocesstechnology)provedtobestableforawidevarietyofloadingconditions:loadThesetwopolesmustbeseparatedsufficientlytoguaranteecurrentsofupto200mA,equivalentseriesresistanceofupto3somephasemargin,asdictatedbyNyquistcriterion[1].The,andloadcapacitorsrangingfrom1.5nFto20mF.Thetotalcor
6、respondingunity-gainfrequency(UGF)orgain-bandwidthquiescentcurrentflowingthroughtheregulatorwaslessthan30(GBW)productofthemodelpresentedismAduringzeroload-currentconditions.IndexTerms—Compensationamplifier,frequencycapacitor(3)multiplier,Millercompensation,regulator.assumingthatpoleliesinthev
7、icinityoftheUGForathigherI.INTRODUCTIONfrequencies.Aright-handplanezeroalsoresultsinthetopologydescribed().Thiszeroexistsbecausecapac-POPULARtechniqueforcompensatingamplifierfeed-itorprovidesanoninvertingfeed-forwardpath,whichbe-Abackcircuits
