rf电阻衰减器设计

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1、RFResistorAttenuatorPadDesignABSTRACT-ofthebasicsofthedesignandbuildofRFresistorattenuatorpadsincludingPi,TandBridgedTsectionresistivepadsandtheircalculations.RFattenuatorsincludes:  • RFattenuatorbasics  • Resistorattenuator  • Attenuatorresistorvalues  • Balancedattenuator  • Var

2、iablePINdiodeattenuator  • Building/constructionofRFattenuatorsRFresistorattenuatorsorresistorattenuatorpadsareusedinmanyRFcircuitdesignapplications.TheRFattenuatorpadsreducethelevelofthesignalandthiscanbeusedtoensurethatthecorrectradiosignallevelentersanothercircuitblocksuchasmixe

3、roramplifiersothatitisnotoverloaded.WithattenuatorpadsincludingthePiattenuatorpad,TattenuatorpadandbridgedTattenuatorpadtopologies,itisnecessarytolookateachoneinturn.TheRFresistiveattenuatorpadsalsoenablethecorrectimpedancelevelstobeseeninbyparticularcircuitssuchasmixersthatmaybeim

4、pedancesensitive.Theresistorattenuatorpadhastheeffectofreducinganymismatch,althoughnaturallysomesignalislost.Whileitispossibletobuyreadymaderesistiveattenuators,itisalsoeasytomakeattenuatorsformanyapplications.Hereasimpleresistornetworkcanbeusedtomakeattenuatorsthatprovidelevelsofa

5、ttenuationuptofiguresof60dBandatfrequencyof1GHzandmore,providedthatcareistakenwiththeconstructionandthechoiceofcomponents.1AttenuatorpadtypesThemainformatsforRFresistorattenuatorpadsaresummarisedbelow:·Piattenuatorpads: Asthenameindicatesthepiattenuatorpadhasatopologysimilarinshape

6、totheletterPi.Ithasasingleseriesresistorinthesignallineandattheinputandoutputaresistoristakentoground.·Tattenuatorpads: IntermsoftopologytheTattenuatorpad(orTeeattenuatorpad)istheoppositeofthePisectionresistiveattenuator.Ithasasingleresistortogroundandhasseriesresistorsontheinputan

7、doutput,formingaTsection.·BridgedTattenuatorpads: ThebridgedTattenuatorcanbethoughtofasacombinationofthePiandTattenuatorpadtopologies.BoththePiattenuatorpadformatandtheTattenuatorpadformatperformequallywell.Oftenthepreferenceofwhichtypetouseisamatterofpersonalpreferenceforthedesign

8、er.1TattenuatorpadformatTh