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1、OPAMPBASICSHOpAmpHistory©1OpAmpBasics1Introduction2OpAmpTopologies3OpAmpStructures4OpAmpSpecifications5PrecisionOpAmps6HighSpeedOpAmps2SpecialtyAmplifiers3UsingOpAmpswithDataConverters4SensorSignalConditioning5AnalogFilters6SignalAmplifiers7HardwareandHouse
2、keepingTechniquesOPAMPAPPLICATIONSOPAMPBASICSCHAPTER1:OPAMPBASICSJamesBryant,WaltJung,WaltKesterWithinChapter1,discussionsarefocusedonthebasicaspectsofopamps.Afterabriefintroductorysection,thisbeginswiththefundamentaltopologydifferencesbetweenthetwobroadest
3、classesofopamps,thoseusingvoltagefeedbackandcurrentfeedback.Thesetwoamplifiertypesaredistinguishedmorebythenatureoftheirinternalcircuittopologiesthananythingelse.Thevoltagefeedbackopamptopologyistheclassicstructure,havingbeenusedsincetheearliestvacuumtubeba
4、sedopampsofthe1940and1950’s,throughthefirstICversionsofthe1960’s,andincludesmostopampmodelsproducedtoday.ThemorerecentICvariationofthecurrentfeedbackamplifierhascomeintopopularityinthemid-to-late1980’s,whenhigherspeedICopampsweredeveloped.Factorsdistinguish
5、ingthesetwoopamptypesarediscussedatsomelength.Detailsofopampinputandoutputstructuresarealsocoveredinthischapter,withemphasishowsuchfactorspotentiallyimpactapplicationperformance.Insomesenses,itislogicaltocategorizeopamptypesintoperformanceand/orapplicationc
6、lasses,aprocessthatworkstosomedegree,butnotaltogether.Inpractice,oncepastthoseobviousapplicationdistinctionssuchas"highspeed"versus"precision,"or"single"versus"dualsupply,"neatcategorizationbreaksdown.Thisissimplythewaytheanalogworldworks.Thereismuchcrossov
7、erbetweenvariousclasses,i.e.,ahighspeedopampcanbeeithersingleordual-supply,oritmayevenfitasaprecisiontype.Alowpoweropampmaybeprecision,butitneednotnecessarilybesingle-supply,andsoon.Otherdistinctioncategoriescouldincludetheinputstagetype,suchasFETinput(furt
8、herdividedintoJFETorMOS,whichinturnarefurtherdividedintoNFETorPFETandPMOSandNMOS,respectively),orbipolar(furtherdividedintoNPNorPNP).Then,allofthesecategoriescouldbefurtherdescribedintermsofthetypeofin
