放大器的构成与工作原理

学电子跟我来FOLLOWME62IIIBCII=BEII)1(+=VApA输入小电流三极管直流电源输出大电流（放大状态）IBIC输入小电压小电流大电流偏置电流（放大状态）电阻电阻输出大电压直流电源三极管iA学电子跟我来FOLLOWME63C1RbIBICRCVcc输入信号VBBVCCVCCVCCRbRbRcRcRcRbC1RbIBICRCVcc输入信号VBBVCCVCCVCCRbRRbRRcRRRcRRbR学电子跟我来FOLLOWME64VccRcRbRLC1C250=0=EUBEQVBQIbR)(02.02707.06mAKRVVIbBEQCCBQ=−=−=)(102.050mAIIBQCQ=×==CEQV)(4216VRIVVCCQCCCEQ=×−=−=VccRcRbRLC1C200ttVBEICQIC0.7V1mA00ttVCEQVCEIBIBQ0.02mA4VVCCRb270KICQIBQRCRL6V6K2KC2CC1BEVCCRb270KICQIBQRCRL6V6K2KC2CC1BEuiuOVBEIBIBQVCEQVCE0tttttt0.7V00000IcIcQ输出信号（a）（b）（c）（d）（e）（f）学电子跟我来FOLLOWME65BVBEQViuBEVCRCRCRCRCEVCEVCEVCEVCILRLRCEQVRc6V6K2K1K20K10KRb1Rb2C2C3C1CBEVccRLReCQICCV1I1I1I1I1bR1bR1bR1bR2bR2bR2bR2bR2I2IBQIBQIBQIBQICCbbbBVRRRV212+=Rc6V6K2K1K20K10KRb1Rb2C2C3C1CBEVccRLReBQIBQICQICQICQICQICQIEQIEQIEQIEQIBQCQEQIII+=CQBQII=EQCQII≈EVEVEVEVEEQERIV=BVBEVBQIBQCQII=↑CQI→↑EQI→↑EV→↓BEV→↓BQI→↓CQI学电子跟我来FOLLOWME66BQI1bR1bR2bR2bReReReReReRCCEVV)31~51(=CQICQIVccRc2K6VCERe1KIEQICQVcc6VRb120KRb210KC1BIBQI1I2VccRc2K6VCERe1KIEQICQVcc6VRb120KRb210KC1BIBQI1I2CQICQI↓CQI→↓EQI→↓EV→↑BEV→↑BQI→↑CQI