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1、Thisarticlehasbeenacceptedforinclusioninafutureissueofthisjournal.Contentisfinalaspresented,withtheexceptionofpagination.IEEEJOURNALOFSOLID-STATECIRCUITS1ImpedanceAdaptingCompensationforLow-PowerMultistageAmplifiersXiaohongPeng,Member,IEEE,WillySansen,Fellow,IEEE,LigangHou,Jinh
2、uiWang,andWuchenWuAbstract—Apower-efficientfrequencycompensationtopology,performanceandenrichdesignmethodologiesformultistageImpedanceAdaptingCompensation(IAC),ispresentedinthisamplifiers,thispaperpresentsanewfrequencycompensationpaper.ThisIACtopologyhas,ononehand,anormalMillert
3、opology,ImpedanceAdaptingCompensation(IAC),whichcapacitor,whichisstillneededtoprovideaninternalnegativefeedbackloop,andontheotherhand,aserialRCimpedanceasaeffectivelyextendsthegain-bandwidthproduct(GBW)whileloadtotheintermediatestage,improvingperformanceparametersminimizingthe
4、powerdissipation.suchasstability,gain-bandwidthproductandpowerdissipation.Athree-stageIACamplifierwasimplementedandfabricatedinII.REVIEWa0.35mCMOStechnology.ExperimentresultsshowthattheimplementedIACamplifier,drivinga150pFloadcapacitance,Forbetterunderstandingandcomparison,thiss
5、ectionreviewsachievedagain-bandwidthproduct(GBW)of4.4MHzwhiledis-someoftheexistingtopologies.sipatingonly30Wpowerwitha1.5Vsupply.Inathree-stageNMCamplifier,twoMillercapacitorsIndexTerms—Multistage,amplifier,amplifiers,compensation,andareattachedfromtheoutputtoeachprecedingstagelo
6、wpower,lowvoltage,impedanceadapting.respectively,formingtwonegativefeedbackloops.Theydoen-surestability,buttremendouslyreducethehigh-frequencygain.Asshowninpreviousworks[3],[4],thisNestedMillerCom-I.INTRODUCTIONpensationrequiresalargevalueoflast-stagetransconductanceSTHEMOSTfu
7、ndamentalanalogbuildingblock,the,givenbyAhigh-gainoperationalamplifierhasalwaysbeenthekeyelementforachievinghighperformanceinadvancedanalog(1)circuitsandsystems.However,inCMOStechnology,thetrendForasingle-stageamplifier,forthesameGBWandspeci-offurtherscalingdownthechannellengtha
8、ndsupplyvoltagefication,amuchsmallertransconductanceisrequired
