HIGHSPEEDDATACONVERSION高速数据转换.pdf

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1、®HIGHSPEEDDATACONVERSIONByMikeKoen(602)746-7337INTRODUCTION1Thedesignconsiderationsforhigh-speeddataconversionV+are,inmanyways,similartothosefordataconversioningeneral.HighspeedcircuitsmaysometimesseemdifferentR5becausedevicetypescanbelimitedandonlycertaindesigntechniquesandarc

2、hitecturescanbeusedwithsuccess.But3VQBIAS16thebasicsarethesame.Highspeedcircuitsorsystemsarereallythosethattendtopressthelimitsofstate-of-the-artQ4dynamicperformance.R2ThisbulletinfocusesonthemorefundamentalbuildingR44Q1blockssuchasopamps,sample/holds,digitaltoanalogandVINQ2VOU

3、Tanalogtodigitalconverters(DACsandADCs).ItconcludesR3withtesttechniques.Opamps,whichtendtobethebasicR1buildingblocksofsystems,arebeconsideredfirst.Sample/Q3holdswhichplayanimportantroleindataconversionareconsiderednextfollowedbyDACsandfinallyADCs.ADCsVBIAS2Q5arereallyacombinati

4、onoftheotherthreecircuits.Emphasisisgiventohybridandmonolithicdesigntechniquessince,inR6practice,thehighestlevelsofperformanceareachievedusingtheseprocesses.Thematerialispresentedfromadesignperspective.Theoryandpracticalexamplesareof-V–feredsoboththedataconversioncomponentdesig

5、neranduserwillfindthematerialuseful.TheconceptspresenteddoFIGURE1.HighSpeedBipolarBuffer.notrequireextensiveexperiencewithdataconversion.Fun-damentalconceptsarediscussedallowingthesubjecttobeunderstoodeasily.Thematerialemphasizeshighspeedcir-AMPLIFIERARCHITECTUREScuitconsiderat

6、ions—circuittheoryisnottreatedindepth.AmplifiersofalltypesplayanimportantroleindataTopicsCoveredinthisBulletinconversionsystems.Sincehighspeedamplifiersarebothusefulanddifficulttodesign,anunderstandingoftheirA.AmplifierArchitecturesoperationisimportant.Fourdifferenttypesofampli

7、fier1.Bufferarchitectureswillbediscussed.Buffers,opamps,openloop2.Operationalamplifiers,andcomparatorscanbefoundinjustaboutany3.OpenLoopsignalprocessingapplication.4.ComparatorB.AmplifierApplications1.Sample/HoldTHEBUFFER112.PeakDetectorTheopenloopbufferistheubiquitousmodernfor

8、moftheC.DigitaltoAnalogConvertersemitterfollower.Thisc