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1、Newoutputstageforlowsupplyvoltage,high-performanceCMOScurrentmirrors.A.Torralba‘.R.G.Carvajal’,F.MuriozandJRamirez-Angulo’‘DepartamentodeIngenieriaElectronica,EscuelaSuperiordeIngenieros,UniversidaddeSevilla,Spain,’KlipschSchoolofElectricalandComputerEngineering,NewMexic
2、oStateUniversity,LasCruces,NM.Abstract:ThispaperpresentsanewsimpleoutputstageI,’,NotethattransistorsM4.Ms,andM6,andtheirbiasingforCMOScurrentmirrors.Thestageisanewlow-voltagecurrentsI,andIs,implementa“super-cascodetransistor”.regulatedcascodecircuit,whichachievesaveryhig
3、houtputimpedanceandaccuratecurrentcopywhencombinedwiththeinputstageshownin[l].A122MHzbandwidthwith1Vsupplyvoltagehasbeenobtainedusingastandard0.35pnCMOStechnology.i/NI1.IntroductionLowsupply,high-performance,CMOScurrentmirrorsusetheinputstageinfigurelathatprovidesshuntfe
4、edbacktoachievelowinputimpedancewithverylowinputvoltagerequirement.Ahighperformancecurrentmirrorshouldalsoprovideaccuratecurrentcopyandveryhighoutputimpedance.Ithastoheabletooperateatahighfrequencywithlowsupplyvoltageandlowinputioutputvoltagerequirements.Severaloutputsta
5、gesforlowvoltageCMOScurrentmirrorshavebeenproposed.FigureIC[2]isacompleximplementationofthewell-knownregulatedcascodeoutputstageoffigurelb[3],wherethedraintosourcevoltageVDsoftransistorMZisforcedtoheequaltothatoftransistorM,bymeansoffeedback,usingtwoop-amps.Inthis‘papera
6、newsimpleoutputstageforhigh66performanceCMOScurrentmirrorswithlowvoltagesupplyrequirementsisproposed(figure2).Itusestheinputstageoffigurela[I],whichforcestheV,,voltageoftransistorMItoaconstantvaluebymeansoftransistorM,,currentsourcele,andvoltagesourceV,.Areplicaofthiscir
7、cuitisusedtoforcetheVDsvoltageoftheoutputtransistorM2tobeequaltothatoftransistorMIbymeansoftransistorM4,currentsourceI,,andvoltagesourceV,.Inordertohavehighoutputimpedance,theoutputcascodetransistorMSisdrivenbythedrainoftransistorM4.AsthepolarityinthedrainoftransistorM4i
8、sreversed,aninvertingstageisrequiredtodrivethegateoftransistorMr.Thisinvertingstageprovidesadditionalga
