Improvement of Power Supply Rejection Ratio

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1、ImprovementofPowerSupplyRejectionRatioofLDODeterioratedByReducingPowerConsumptionSocheatHENGandCong-KhaPHAMDepartmentofElectronicEngineering,TheUniversityofElectro-CommunicationsTokyo,JAPANEmail:socheat@vlsilab.ee.uec.ac.jp;pham@ee.uec.ac.jpAbstract—Inthiswork,th

2、ebulk-gatecontrolledcircuittoimprovethepowersupplyrippleratio(PSRR)ofaLowDropoutRegulator(LDO)whichdeterioratesduetoloweringpowerconsumptionisproposed.Designingwith0.25μmCMOSprocess,thesimulationresultsbyHSPICEshownthattheproposedcircuitprovidesahighperformanceof

3、PSRReventhough1/10ofthepowerconsumptionisreducedcomparetotheconventionalcircuit.Itisconfirmedthatabout40[dB]at10[Hz]frequencyand20[dB]at1[kHz]frequencyofPSRRaretogetherimproved.I.INTRODUCTIONWhentheoperationvoltageofelectronicdevicesissuppliedbyaDC-DCconverter,iti

4、simpossibletoavoidtheripplenoisevoltagecomesalongthepowersupplyline.ForthecommunicationsdevicessuchasmobilephoneswhichhaveFig.1.BasicLowDropoutRegulatorCircuit.thetransmissionandreceptioncircuitwhichoperatesatahighfrequency,theripplenoiseofthepowersupplylinehasab

5、adinfluenceonthestabilityofthetransmissionfrequency.Theinstabilityofthetransmissionfrequencywillresultin(PSRR)canbedeterminedbythreeregionsoffrequency.adeterioratedvoiceorcommunicationquality.Hence,itisTheyarethePSRRatDCandalowfrequencyPSRRDC,necessarytoreducether

6、ipplenoisevoltageasmuchasthePSRRatamoderatefrequencyPSRRMFandthePSRRpossible.atahighfrequencyPSRRHF.Inthiswork,wefocusonlyToreducearipplenoisevoltage,needlesstosay,itwasontheimprovementofPSRRDCandPSRRMFwhicharerequiredtomaintaintheresponsespeedoftheerroramplifier.

7、generallydemandedbymostofapplications.ItmeansthattheThisisthemainreasonthatmakesthebiascurrentoftheerrorimprovementofthePSRRatafrequencyrangeofseveral[Hz]amplifiercannotbereduced.Asaresult,alowpowerLDOtoabout10[KHz].ThedefinitionofthePSRRatalowandhavingahighPSRRper

8、formancecannotberealizedwithamoderatefrequenciescanbesummarizedasfollows[1].conventionalLDOstructure.ThefirstregionofthePSRR(DCandlowfrequency)isInthispaper,wep