习题2-25 Rb1C11RSP110Rb21VT1RE1C12Rb22RE2RC2VT2CE2C22+VCC?=100rbe1=5.3k?rbe2=6.2k?VCC=12VRS=20k?Rb1=1.5M?RE1=7.5k?Rb21=91k?Rb22=30k?RC2=12k?RE2=5.1k?RL?Us?Uo解：微变等效电路：RSrbe1Rb1?Uo?Ui?RC2RL?1I?b1RE1Rb21Rb22rbe2?2Ib2?rbe1=5.3k?Uorbe2=6.2k??UVCC=12ViRRRrRR??E1b21b22be2C2L?2Ib2?1Ib1RS=20k?Ri1Ri2Rb1=1.5M?①Ri2?Rb21//Rb22//rbe2?4.86k?RE1=7.5k?Ri?Ri1?Rb1//[rbe1?(1??)(RE1//Ri2)]Rb21=91k?Rb22=30k??252k?RC2=12k?RE2=5.1k?R?R?12k?oC2RSrbe1Rb1?=100
?rbe1=5.3k?Uorbe2=6.2k??UiVCC=12V?RC2RL?1I?b1RE1Rb21Rb22rbe2?2Ib2RS=20k?Ri1Ri2RE1=7.5k?②RL??,RS?0时RC2=12k?(1??)(RE1//Ri2)Au1??0.98RE2=5.1k?rbe1?(1??)(RE1//Ri2)Ri=252k??RC2Ri2=4.86k?A????193.5u2RSrbe1Rb1?=100rbe2Au?Au1?Au2??189.6RS?20k?时RiAus?Au??175.7Ri?RS?=100?rbe1=5.3k?Uorbe2=6.2k??UiVCC=12VRRRrRR??E1b21b22be2C2L?2Ib2?1Ib1RS=20k?Ri1Ri2RE1=7.5k?③当RS=20k?时，如果去掉射极输出器，则RC2=12k?Ri?Ri2?4.86k?RE2=5.1k?Au?Au2??193.5Ri=252k?Ri2=4.86k?RiRSrbe1Rb1Aus?Ri?RSAu??37.8
习题2-26Rb11C11P110Rc1C12VT1Rb2VT2Re2C22+VCC?=100rbe1=6.2k?rbe2=1.6k?VCC=12VRb11=91k?Rb12=30k?Rc1=12k?Re1=5.1k?Rb2=180k?Re2=3.6k?RL=3.6k??Rb12UiRe1Ce1?URLo微变等效电路：rbe2?Ui?Uo?RRb2?IRb11Rb12rbe1?I?RRL1b1c12b2e2rbe1=6.2k??Uo?rbe2=1.6k?UiRb11=91k??Rc1Rb2?IRb11Rb12rbe1?IR?RL1b12b2e2Rb12=30k?Ri1Ri2Rc1=12k?①Ri?Ri1?Rb11//Rb12//rbe1?4.86k?Re1=5.1k?Ri2?Rb2//[rbe2?(1??)(Re2//RL)]?90.8k?R=180k?b2r?(Rc1//Rb2)Re2=3.6k?Ro?be2//Re2?122?RL=3.6k?1??②RL=∞时，Ri2?Rb2//[rbe2?(1??)Re2]?120.6k?Au1??[?(Rc1//Ri2)]/rbe1??176(1??)Re2Au2??0.996?Au?Au1?Au2??175.3rbe2?(1??)Re2rbe2?=100
rbe1=6.2k??Uo?rbe2=1.6k?UiRb11=91k??RRb2?IRb11Rb12rbe1?I?RRL1b1c12b2e2Rb12=30k?Ri1Ri2Rc1=12k?RL= 3.6k?时，Re1=5.1k?Ri2?Rb2//[rbe2?(1??)?Re2//RL?]?90.8k?R=180k?b2Re2=3.6k?Au1??[?(Rc1//Ri2)]/rbe1??171RL=3.6k?(1??)?Re2//RL?Au2??0.991rbe2?(1??)?Re2//RL?rbe2?=100?AuL?Au1?Au2??169.5AuL?96.7%Au?=100rbe1=6.2k??Uo?rbe2=1.6k?UiRb11=91k??Rc1Rb2?IRb11Rb12rbe1?IR?RL1b12b2e2Rb12=30k?Ri1Ri2Rc1=12k?③如果去掉射极输出器，则Re1=5.1k??Rc1Rb2=180k???193.55RL=∞时，Au??Re2=3.6k?rbe1RL=3.6k?R=3.6k?时，Lrbe2AuL????Rc1//RL?rbe1??44.67AuL?23.1%Au
习题2-27P110答：①测静态工作点Q ：直流稳压电源、万用表(直流电压档)②测电压放大倍数Au ：直流稳压电源、正弦波信号发生器、示波器、交流毫伏表。③测最大输出电压幅度Uom：同②④测输入电阻Ri：同②⑤测输出电阻Ro ：同②习题2-28P111本题为实验题，略
模拟电子技术基础简明教程杨素行（第三版）
