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1、APRIL1979EIASTANDARDSTANDARDFORTHEMEASUREMENTOFSMALL-SIGNALTRANSISTORSCATTERINGPARAMETERSELECTRONICINDUSTRIESASSOCIATIONSTANDARDRS-435FormulatedbyJEDECSolidStateProductsCouncilRecommendedstandardaererdoptedbyEL4withoutregerdtowhetherornottheiradoptionmayInvolvepeten
2、tsonarticles,materiels,orprocesses.BYsuchactton,EIAdoeanotUNEUmyliabilitytoanypatentowner,nordoesitwumennyobltgetionwhatevertoweaadoptlugtherecommendedstendards.PublishedbyELECTRONICINDUSTRIESASSOCIATIONEngineeringDepartment2001EyeStreet,N.W.,Wuhiqton,D.C.200060Elec
3、tronicIndustriesAssociation1916Allfi,hU““rndPRICE:PREFACEThesymbolsandtermsofthisdocumentarecontainedinJEDECPublicationNo.77andarenotinconflictwiththoseinIECPublication147-OC.Themeasurementprocedure.8aresimilartothosepublishedinIEC.RS-435page1STANDARDFORTHEMEASUREME
4、NTOFSMALLSIGNALTRANSISTORSCATTERINGPARAMETERS(FromJEDECTentativeStandardNo.IOandStandardsProposalNo.1178,formulatedbyJEDECCommitteeK-24onHighFrequencySign01DiodesandTmnsirtonandapprovedbytheJEDECSolidStateProductsCouncil.)1.DEFINITIONS1.1DefinitionoftheScatteringPar
5、ametersGivenatwo-portnetworkasshowninFigure1,thescatteringparametersmaybedefinedastheelementsofthematrix(1and2)”Qls12s=(1)s21s22associatedwiththelinearequationsbl=s11a1+“12a2(2)b2=s21al+s22a2(3)wherea.=--&(Vi+ZOIi)1(4)0bi=*(‘i-‘OIi)(5)i=1,2HereZ.isdefinedasa&impedan
6、cecalledthenormalizing(orreference)impedance,usuallytakentobe50ohms.Whenothervaluesareused,thevaluemustbespecifiedalongwithotherconditionssuchasfrequency,bias,temperature,etc.I.‘BracketednumbersrefertoreferencesonpageRS-435Page2Eachoftbescatteringparametersmaybeindi
7、viduallydefinedaafollows:811isthevoltage(orcurrent)reflectioncoefficient(withrespecttoZn)atportonewithporttwoterminatedinZO;i.e.,blel/Il)-ZO*11=q(6)=Wl)+Zoz=Z=za=O2120812istbereversetransmissioncoefficientwithportoneterminatedinZOandporttwodrivenwithageneratorofimpe
8、danceZO;i.e.,bl“1s12=-=(Vo/2,(7)a2al=0z1=z2=zowhereV.istbeopen-circuitgeneratorvoltage.821istheforwardtransmissioncoefficientwithporttwote
