Ferroelectric Materials and Their Applications in Electronic Circuits.pdf

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1、FERROELECTRICMATERIALSANDTHEIRAPPLICATIONSINELECTRONICCIRCUITS鐵電材料在電子電路中之應用JIA-SHIANGFU傅家相NATIONALCENTRALUNIVERSITY,TAIWANSEPTEMBER2009ShiangFu©2009-JiaOutlineDefinitionofFerroelectricityBriefHistoryontheDiscoveryofFerroelectricityPerovskiteFerroelectricCeramicsApplicationso

2、fFerroelectricMaterialsinElectronicsShiangFu©2009-1JiaGeneralDefinitionSpontaneouspolarizationthatcanbereversedbyanexternalEfieldShiangFu©2009-2JiaDiscoveryofFerroelectricity11920

3、Valasek–Rochellesalt(KNaCHO˙4HO)44621935

4、BuschandScherrer–KHPO241945

5、WulandGoldman–BaTiO31949

6、

7、Matthias–KNbOandKTaO331949

8、MatthiasandRemeika–LiNbO3andLiTaO31950

9、Shirane,Hoshino,andSuzuki–PbTiO3ShiangFu©2009-3JiaPerovskiteCrystalStructureShiangFu©2009-ABXingeneral43JiaPhaseTransitionShiangFu©2009-5JiaApplicationsVaractorsforRF/MicrowaveCircuitsElectro-OpticModulators

10、High-kDielectricsFerroelectricRAM(FeRAM)FerroelectricTunnelJunctionsMultiferroicMaterialsPiezoelectricTransducersPyroelectricDetectorsShiangFu©2009-6JiaVaractorsforRF/MicrowaveTunableCircuits–MotivationMulti-standardoperationisneededinmodernmobiledevicesShiangFu©2009-7JiaV

11、aractorsforRF/MicrowaveTunableCircuits–MotivationAdaptivecomponentscanbeusedtoreducethesizeandcostofRFfront-endShiangFu©2009-8JiaFerroelectricVaractorsParaelectricphaseispreferred.TofBST(BaSrTiO)canbeC1-xx3adjustedbyBa/Srratio.ShiangFu©2009-9JiaComparisonofVaractorTechnologie

12、sVaractorDiodeMEMSFerroelectricTunabilityhighlowmediumQualityFactormediumhighmediumBiasVoltagemediumhighmediumTuningSpeedfastslowfastPowerHandlinglowmediumhighLinearityimprovablehighimprovableShiangFu©2009-10JiaSeries-ConnectedVaractorsforLinearityImprovementRFswingacrosseachel

13、ementisreduced.ShiangFu©2009-11JiaSeries-ConnectedVaractorsforLinearityImprovementBiasresistorsarenecessaryforpreservingthetunability.ShiangFu©2009-12JiaApplicationsinTunableRF/MicrowaveCircuitsPhaseshifters,e.g.varactor-loadedtransmissionlines,forphasedarraysTunablefiltersby

14、loadingtheresonatorswithvaractorstochangetheirr