High Speed Data Conversion.pdf

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1、®HIGHSPEEDDATACONVERSIONByMikeKoen(602)746-7337INTRODUCTION1Thedesignconsiderationsforhigh-speeddataconversionV+are,inmanyways,similartothosefordataconversioningeneral.HighspeedcircuitsmaysometimesseemdifferentR5becausedevicetypescanbelimitedandonlycertaindesigntechniquesanda

2、rchitecturescanbeusedwithsuccess.But3VQBIAS16thebasicsarethesame.Highspeedcircuitsorsystemsarereallythosethattendtopressthelimitsofstate-of-the-artQ4dynamicperformance.R2ThisbulletinfocusesonthemorefundamentalbuildingR44Q1blockssuchasopamps,sample/holds,digitaltoanalogandVINQ

3、2VOUTanalogtodigitalconverters(DACsandADCs).ItconcludesR3withtesttechniques.Opamps,whichtendtobethebasicR1buildingblocksofsystems,arebeconsideredfirst.Sample/Q3holdswhichplayanimportantroleindataconversionareconsiderednextfollowedbyDACsandfinallyADCs.ADCsVBIAS2Q5arereallyacom

4、binationoftheotherthreecircuits.Emphasisisgiventohybridandmonolithicdesigntechniquessince,inR6practice,thehighestlevelsofperformanceareachievedusingtheseprocesses.Thematerialispresentedfromadesignperspective.Theoryandpracticalexamplesareof-V–feredsoboththedataconversioncompon

5、entdesigneranduserwillfindthematerialuseful.TheconceptspresenteddoFIGURE1.HighSpeedBipolarBuffer.notrequireextensiveexperiencewithdataconversion.Fun-damentalconceptsarediscussedallowingthesubjecttobeunderstoodeasily.Thematerialemphasizeshighspeedcir-AMPLIFIERARCHITECTUREScuit

6、considerations—circuittheoryisnottreatedindepth.AmplifiersofalltypesplayanimportantroleindataTopicsCoveredinthisBulletinconversionsystems.Sincehighspeedamplifiersarebothusefulanddifficulttodesign,anunderstandingoftheirA.AmplifierArchitecturesoperationisimportant.Fourdifferent

7、typesofamplifier1.Bufferarchitectureswillbediscussed.Buffers,opamps,openloop2.Operationalamplifiers,andcomparatorscanbefoundinjustaboutany3.OpenLoopsignalprocessingapplication.4.ComparatorB.AmplifierApplications1.Sample/HoldTHEBUFFER112.PeakDetectorTheopenloopbufferistheubiqu

8、itousmodernformoftheC.DigitaltoAnalogConvertersemitterfollower.Thisc