差动放大电路的工作原理

11.2.1)2)3)4)2T1T2Vo=Vc1-Vc2=0VVc1Vc2Vo=Vc1-Vc2=0VVidT1Vid/2T2Vid/2T1Vo/2T2Vo/2T1T2R11kR21kR315kR415kRL10k+Vcc+15V+-Vi+-VoRe1K3VicVo=Vc1-Vc2=0VAvc=01vidoidovA2/V2/VVVA===be1c2c1c2)1(rRRVVββ+++−==iceVRT1T2R11kR21kR315kR415kRL10k+Vcc+15V+-Vi+-VoRe1K4T1T2R11kR21kR315kR415kRL10k+Vcc+15V+-Vi+-VoRe1K53.1)VI1=VI2=0VT1T2R11kR21kRc115kRc215kRL10kRe15k+Vcc-Vcc+15V-15V+-Vi+-VoecceccBERRVRVVIe≈−−−=)(06eCCRECCRVIIIIe221121==≈=T1T2R11kR21kRc115kRc215kRL10kRe15k+Vcc-Vcc+15V-15V+-Vi+-Voβ121CBBIII==)V(RR2VVVVVVBECeCCCCEC2CE1CE−−−=−==715VRc1=Rc2=ReT1T2R11kR21kRc115kRc215kRL10kRe15k+Vcc-Vcc+15V-15V+-Vi+-VoCC2CE1CEV21VV≈=82•Veve=0VeT1T2R11kR21kRc115kRc215kRL10kRe15k+Vcc-Vcc+15V-15V+-Vi+-Vo9RL’=Rc1//(RL/2)VoVidT1T2R11kR21kRc115kRc215kRL10kRe15k+Vcc-Vcc+15V-15V+-Vi+-Vo1be'L1vvdr1RRAA+==β)1(21beirRR+=12coRR=10•Vc1Vc2Voc=Vc1-Vc2=0VT1T2R11kR21kRc115kRc215kRL10kRe15k+Vcc-Vcc+15V-15V+-VoVic0VVAicocvc==113Avc0AvdAvcKCMRKCMRvcvdCMRAAK=vcvdCMRAlg20Alg20K−=124.ƒƒƒƒ•T1T2R11kR21kRc115kRc215kRL10kRe15k+Vcc-Vcc+15V-15V+-Vi+-Vo13••RL’=Rc1//RLRo=Rc1'112121beLvdvdrRRAA+==βT1T2R11kR21kRc115kRc215kRL10kRe15k+Vcc-Vcc+15V-15V+-ViVo14T1T2R11kR21kRc115kRc215kRL10kRe15k+Vcc-Vcc+15V-15VVoVic'L1bocRIVβ−=e1b1be1b1bRr1RicRI)1(2rI1RIVVVVe1beβ+++=++=e1be'LicocvcR)1(2r1RRVVAββ+++−==15T1T2R11kR21kRc115kRc215kRL10kRe15k+Vcc-Vcc+15V-15VVoVic)r1R(2R)1(2r1RAAK1bee1be1vc1vdCMR++++==β16•Vi1Vi2VidVicT1T2R11kR21kRc115kRc215kRL10kRe15k+Vcc-Vcc+15V-15VVi+-Vo17T1T2R11kR21kRc115kRc215kRL10kRe15k+Vcc-Vcc+15V-15VVi+-Voi2i1iidVVVV=−=2V2VVVi2i1iic=+=vcicvdidoAVAVV×+×=18Voc=0Vo=Vod+Voc=VodAvdAvc,VodVocVo=Vod+VocVodT1T2R11kR21kRc115kRc215kRL10kRe15k+Vcc-Vcc+15V-15VVi+-Vo19*————Ro————FET205.βReReIE)r1R(2R)1(2r1RAAK1bee1be1vc1vdCMR++++==βRe*T1T2R11kR21kRc115kRc215kRL10k+Vcc-Vcc+15V-15VVi+-VoI21T1T2T3T4R11kR21kR315kR415kRL10kR56.8kR66.8kR710k+Vcc-Vcc+15V-12V+-Vi+-Vo+-Vo1