如何设计阻抗匹配网络第二部分课件

ImpedanceMatchingNetworkDesign(II)中華大學通訊系田慶誠0351860301中華大學通訊系Mixed-modeL-Type

MatchingNetworkTheshuntinductorsandcapacitorscanbereplacedbyshortandopenstubs.Z=jwL=jZ0tanqZ0q=blY=jwC=jY0tanqY0q=bl2中華大學通訊系Cascaded50WTransmissionlineZ1G1G2Z0=50W,q=blG1G2以原點為中心順時針畫圓3中華大學通訊系DistributedSingle

SectionMatchingZSM1G350WRAXISG3OnlyworkwhenR>50WandG>1/50mho.(RegionIandII)5中華大學通訊系DistributedL-Type

MatchingNetworkZOSZTG350WZT=100W50WG3ZT>ZSM16中華大學通訊系DistributedSingle

SectionMatchingRAXISZSM2G450WG47中華大學通訊系DistributedL-Type

MatchingNetworkZSSZTG450WZT=30W50WZT<ZSM2G48中華大學通訊系BodeFanoCriteriaLosslessMatchingNetworkCPRPGCKTG(w)CSRSGCKT

BroaderbandwidthHigher

G(w)

G(w)=0onlyexistsatafinitenumberoffrequencies10中華大學通訊系Bandwidthof

LumpedL-TypeMatching10W50WZQValueandbandwidthisfixedbyloadimpedance50W10WQ=212中華大學通訊系50W25W50WL2L3C1C4250W25WL3L2C4C1250W50WQ2=1Q1=3Three-SectionImpedanceMatchingNetwork

(pnetwork:Narrow-banddesign)14中華大學通訊系Four-SectionImpedanceMatchingNetwork

(ConstantQband-passbroadbanddesign)50W22.4W50W10W22.4W50W10WQ=1.11Q=1.1115中華大學通訊系Three-SectionMatchingat1GHz16中華大學通訊系Four-SectionImpedanceMatching17中華大學通訊系MatchingBandwidthv.s.

ImpedanceQThreesectionsQ=3FoursectionsQ=1.11LowerimpedanceQBroadbanddesign18中華大學通訊系ManipulationsofTransistor

BroadbandImpedanceMatchingExample:InputMatchingofInfineonBFP420BJTVCE=1VIC=2.5mAInputMatchingFrequencyRange:1.5~4.5GHz20中華大學通訊系InputReflectionCoefficient

ofBFP42021中華大學通訊系Step1SymmetricalAdjustment23中華大學通訊系Step2UsingParallelResonatorInitialstates:THETAO=THETAS=45@2.5GHzZ0O=Z0S=50W24中華大學通訊系Step3ImpedanceTransformationInitialstates:THETAL=90@2.5GHzZ0L=SQRT(15*80)=35W26中華大學通訊系Step3ImpedanceTransformation27中華大學通訊系Step4OptimizationGoal:|S11|<1/31.5GHz4.5GHz28中華大學通訊系Inter-stageMatchingNetworkTransistorInterstageMatchingNetworkTransistorGOUT1GL1GS2GIN2Case(I)SimultaneouslycomplexconjugatematchingCase(II)Atleastonesideisnotmatched30中華大學通訊系SimultaneouslyComplex

ConjugateMatchingCase(I)(GOUT1=

GL1*and

GS2=GIN2*)NoPowerReflectionandNopowerdissipationoccurredinmatchingnetwork.OnlyLosslessmatchingnetworkcanbeused.Anyresistiveelementinmatchingnetworkwillbreaktherule.31中華大學通訊系NotMatchedatOneSideCase(II)(GL1=

GOUT1*but

GS2

GIN2*) FortwocascadedLNAstages

Case(III)(GL1

GOUT1*but

GS2=GIN2*)

FortwocascadedPAstagesMusthaveresistiveelementtoabsorbthereflectedpowerfromsideA,thennoreflectionoccurredinsideB.OnlyLossymatchingnetworkcanbeused.However,thisworkisMissionAlmostImpossible!32中華大學通訊系QuestionHowtomakeainter-stagematchingnetworkasGL1=

GOUT1*but

GS2

GIN2*?GL1GOUT1GS2GIN2Possible?Impossible?33中華大學通訊系常見積非成是的匹配法(一)TransistorInterstageMatchingNetworkTransistorGOUT1GL1=

GOUT1*Gainmatched

GS2=GIN2*GOPTNoisemismatchedGIN2Case(II)LNA1:GL1=

GOUT1*+LNA2:

GS2=GOPTGIN2*常見做法：幾乎都用losslessmatchingQ1Q2做法(一)驗證34中華大學通訊系常見積非成是的匹配法(二)TransistorInterstageMatchingNetworkTransistorQ1Q2Case(II)LNA1:GL1=GOUT1*+LNA2:

GS2=GOPTGIN2*TransistorTransistorGOUT1GL1

GOUT1*GainmismatchedGS2=GOPTNoisematchedGIN2常見做法：幾乎都用losslessmatching做法(二)驗證35中華大學通訊系常見積非成是的匹配法(三)Case(III)PA1:GL1=GOPTGOUT1*+PA2:GS2=GIN2*TransistorInterstageMatchingNetworkTransistorGOUT1GL1=

GOPTPowermatchedGS2GIN2*GainmismatchedGIN2常見做法：幾乎都用losslessmatchingQ1Q2做法(一)驗證36中華大學通訊系常見積非成是的匹配法(四)Case(III)PA1:GL1=GOPTGOUT1*