资源描述：
《A frequency compensation scheme for LDO voltage regulators.pdf》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、IEEETRANSACTIONSONCIRCUITSANDSYSTEMS—I:REGULARPAPERS,VOL.51,NO.6,JUNE20041041AFrequencyCompensationSchemeforLDOVoltageRegulatorsChaitanyaK.Chava,Member,IEEE,andJoséSilva-Martínez,SeniorMember,IEEEAbstract—Astablelowdropout(LDO)voltageregulatortopologyforlowequivale
2、ntseriesresistance(ESR)capacitiveloadsispresented.Theproposedschemegeneratesazerointer-nallyinsteadofrelyingonthezerogeneratedbytheloadcapacitoranditsESRcombinationforstability.Itisdemonstratedthatthisschemerealizesrobustfrequencycompensation,facilitatestheuseofmul
3、tilayerceramiccapacitorsfortheloadofLDOregulators,andimprovestransientresponseandnoiseperformance.TestresultsfromaprototypefabricatedinAMI0.5-mCMOStech-nologyprovidethemostimportantparametersoftheregulatorviz.,groundcurrent,loadregulation,lineregulation,outputnoise
4、,andstart-uptime.IndexTerms—Frequencycompensation,linearregulators,lowdropout(LDO)regulator,LDOstability,powermanagement.Fig.1.TypicalLDOvoltageregulator.I.INTRODUCTIONcascadedwithalinearregulatortoreducethevoltagerippleandOWERmanagementisaveryimportantissueinporta
5、bleimprovethestabilityoftheoverallsystem[3],[5].Pelectronicapplications.Theneedformultipleon-chipTheminimumpermissibledropoutvoltageofalinearvoltagelevelsmakesvoltageregulatorsacriticalpartofanregulatordefinesthemaximumachievableefficiency.Theelectronicsystemdesign
6、.Portableelectronicdeviceslikecellemphasisonefficiencyhasmadelowdropout(LDO)regulatorsphonesrequireveryefficientpowermanagementtoincreasethemostpopularclassoflinearregulators.Butthisincreaseinthebatterylife[1]whereashigh-speedmicroprocessorsneedefficiencyisachieved
7、atthecostofacompromiseinstabilitystablevoltagesthatcansupplyfastvaryingcurrentsontheoftheregulator.LDOregulatorshavehighoutputimpedance;orderoffewamperes[1],[2].Lowsupplyvoltagenoiseisalsothisimpedance,alongwiththeloadcapacitance,createsaanimportantrequirementforno
8、isesensitiveRFcircuitsthatlowfrequencypoleanddecreasestheoverallphasemargin.areintegralpartsofallportableelectronicdevices.Thispapergivesanovervi
