1995,JSSC95 low supply voltage high PSRR

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1、586IEEEJOURNALOFSOLID-STATECIRCUITS.VOL.30.NO.5,MAY1995BriefPapersALowSupplyVoltageHighPSRRVoltageReferenceinCMOSProcessKhong-MengThamandKrishnaswamyNagarajAbstruct-ThispaperdescribesabandgapvoltagereferenceVREGcircuitthatoperateswitha3Vpowersupplyandis

2、compatiblewithadigitalCMOSprocess.Theuseofasimplecircuittopologyresultsinasmallsiliconareaof0.07mm2,apowerconsumptionof1mWandahighpowersupplyrejectionoverawidefrequencyband.Thecircuitrealizesatemperaturecoefficientof85ppdCandastandarddeviationof20mVwith

3、outtrimming.I+ToContrdLoopI.INTRODUCTIONTHEREisagrowingtrendofdesigningprecisionanalogcircuitsworkingoffsupplyvoltagesinthe3Vrange.Thistrendisdrivenbytheneedforbatteryoperatedsystems.Economicreasonsalsoneedthesecircuitstoberealizedinasimpleprocess,witho

4、utresortingtotheuseofspeciallowthresholddevices.Stablevoltageandcurrentreferencesarerequiredinpracticallyeveryanalogcircuit.Muchworkhasbeendoneinbandgapvoltagereferences[1]-[8].SomeofGNDAthesecircuitsuseoperationalamplifiersandadditionalcircuits,Fig.1.B

5、asicbandgapcircuit.thusincreasingsiliconareaandpowerdissipation.Inordertomeetthegoalsoflowpowersupplyvoltageandlowpowerdissipation,itisdesirabletouseasimplecircuitconfigurationbyadditionofanegativetemperaturecoefficient(TC)base-avoidinganoperationalampl

6、ifier.Simultaneously,itisalsoemittervoltageofabipolartransistor,withapositiveTCnecessarytoachievehighpowersupplyrejectionratiooveravoltageobtainedfromthedifferenceoftwobase-emitterbroadfrequencyrangeinordertorejectnoisefromthehighvoltagesbiasedatdiffere

7、ntcurrentdensities.speeddigitalcircuitsonthechip.Thesupplyindependenceaswellasthetemperatureinde-Anopamp-lessbandgapreferenceispresentedin[7].pendenceareachievedbyafeedbackmechanism(discussedWhilethissimplecircuittopologyachievesveryhighPSRRinSection111

8、)thatforcesnode2tobeatthesamepotentialaswithlowpowerdissipation,itneedsarelativelylargesupplynode1.ThissimultaneouslyensuresthatIM~isanaccuratevoltage(>4.25V)foritsoperation.ThispaperwilldescribecopyofIM~.ThebandgapvoltageVBGcanb