的工作原理和分析方法

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200492815.15.25.35.420049282200492835.1.20049284.1.——1:AU=UO/UI2:AI=IO/II3:Ar=UO/II4:Ag=IO/UI200492852.Ri——iiuiRi=ui/iiRi~uSRSAuRi1Riii2RiuiuS200492863.Ro——Au~uS~Rouso200492870,.o.ooSL==∞=URIURRo200492884.fAAm0.7AmfLfH——3dBfbw=fH–fL200492895.PPomUU−=222004928106.12322UUUDL++=2004928115.2IBQ,VBEQ,ICQ,VCEQ1234200492812-++VT123URBIRBBBECCCCb+12VIUVCEBE+UIUB+IIC+U+CEUOUCE-ICRc•iUUBEIBICβIB•oU•••=iouUUA200492813Rb+VCCVBBRCC1C2TiC=βiBuiuoRL200492814IBUBERb+VCCVBBRCC1C2TRL200492815Rb+VCCVBBRCC1C2TRL200492816Rb+VCCVBBRCC1C2TRL20049281710µF~50µFRb+VCCVBBRCC1C2TRL++uiuo200492818Rb+VCCVBBRCC1C2TRL200492819Rb+VCCRCC1C2TRL200492820IBUBEQuiibICUCEicib200492821ICUCEicuCEuCEUCEUi2004928221ceCECEcCCbBBbeBEBEuUuiIiiIiuUu+=+=+=+=2uoui200492823tVvimiωsin=tiIiIIbmBQbBQBωsin+=+=tiIiIIIbmCQcCQBCωββsin+=+==()()CbmCEQCbmCQCCRtiVRtiIEVωβωβsinsin−=+−=bCbmCiRtiRvβωβ−=−=sin0iCibbCivRRRiiRvvAββ−=−==0200492824.Rb+VCCRCC1C2Tui=0IC≠0ICIE=IB+ICRLIB1.——Ui=0IB≠0200492825Rb+VCCRCC1C2TICUBEUCE(IC,UCE)RLIB(IB,UBE)200492826(IB,UBE)(IC,UCE)IBUBEQIBUBEQUCEICICUCEIB2004928272.RR1/jC0jLvsisEcIs200492828Rb+VCCRCC1C2RL200492829Rb+VCCRC200492830IBUBEICUCE1IBUBE≈0.7V)Rb+VCCRCIBUBEbBECCBRUVI−=bCC7.0RV−≈bRVCC≈RbIB2004928312UCEICRb+VCCRCICUCECCCCCERIVU−=IC=βIB200492832VCC=12VRC=4KΩRb=300KΩβ=37.5UBE≈0.7VA400.04mA30012RVIbCCB===≈mAIIBC5.104.05.37=×=≈β6V41.512RIVUCCCCCE=×−=−=IBIC2004928335.3UCE=VCC–ICRCVCCICUCECCCRVQIBUCEIC.IBIBQ200492834.ICUCEIBUBEQuiibibic1.uCEui200492835ICUCEicuCEuCEUCEUi200492836Rb+VCCRCC1C2uiiBiCuCEuououi200492837(ui)2.Rb+VCCRCC1C2RLuiuo1/ωC≈0——200492838RbRCRLuiuo2004928393.RLQ200492840RbRCRLuiuouceicCLLR//RR=′uce=-icRC//RL=-icRL200492841icuceuce=-icRC//RL=-icRLic=-1/RLuceLR1′−-1/R'LR'L=RLRcQ200492842ICUCEVCCCCCRVQIB1-1/R'LR'L=RLRcQ2200492843CELCCVRIE+=''CEQLCQCVRIE+=''Q'CE200492844'CEC2C2VCEQ200492845'LLCeqRRRR==CEQLLCCEQCCeqVRRRVVV+⋅+−=CEQeqCQeqVRIV+=CEQLCQCVRIE+=''2004928464QiCuCE1ibuo2004928472QiCuCEuo2004928483QiCuCEuo“”2004928495••••NPN•ICQVCEQCEQLCQCVRIE+=''•'LRE'C•V2/'CCEQECEQCVE−'2/'CCEQEV•VCESCEQV−2004928505.4BJT200492851.h1hiBuBE∆uBE∆iBbbeBBEbeiuiur=∆∆=BErbe200492852BErbebecubeibrbeeubeibb200492853bciiβ=iCuCEibrce200492854rceiCuCE∆iC∆uCEcceceiur∆∆=200492855ubeibuceicuberbeβibibrceuceichrce2004928562.ebcebcrbeic=βibib2004928572rbeRbRCRLiU•iI•bI•cI•oU•BI•βbeLurRA′β−=bebirIU••=LCLR//RR=′LboRIU′β−=••2004928582rbeRbRCRLiU•iI•bI•cI•oU•BI•βbeLurRA′β−=bebirIU••=LCLR//RR=′LboRIU′β−=••2004928593iiIURi••=beb//rR=ber≈rbeRbRCRLiU•iI•bI•cI•oU•BI•β200492860200492861oU•oI•rbeRbRCiI•bI•cI•bI•β0040U,R.o.ooSLIU=R=∞=coooRIUR==••2004928621.2.AURiR03.2004928631.IcVCEAURiR02.200492864)(94576.126)431(30026)1(300Ω≈++=++=mAmVImVrEbeβbeLiurRUUA'0β−==•••103945.0)2.6//9.3(43−≈×−=)(945.0945.0//470//Ω===krRRbebiCRR=0BBRI3.2004928651BJTBJT231——Q2——QQ3h——2004928665859511516517

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