基本放大电路习题

基本放大电路习题 第二章 基本放大电路 习题 2.1 测得某放大电路的输入正弦电压和电流的峰值分别为10 mV和10 μA， 在负载电阻为2 kΩ时， 测得输出正弦电压信号的峰值为2 V。 试计算该放大电路的电压放大倍数、 电流放大倍数和功率放大倍数， 并分别用分贝(dB)表示。 ，U2V2000mVo，解: A,,,,200u，U10mV10mVi ，Uo2000 ，IR1mAo2000L， A,,,,,100i，，II10μA10μAii PUI,2V,1mA4ooo，A,,,,2，10 pPUI,10mV,10μ0iii UoA,20lg,20lg200,20lg2，20lg100,20，0.7，40,54dB uUi ，Io2 A,20lg,20lg100,20lg10,40dBi，Ii P44oA,10lg,10lg(2，10),10lg2，10lg10,7，40,47dB pPi 2.2 当接入1 kΩ的负载电阻R时， 电压放大电路的输出电压比负载L 开路时的输出电压下降了20%， 求该放大电路的输出电阻。 U511oR,(,1)R,(,1)R,R,(1K,),250,解: oLLL4444Uo5 2.3 说明图2-50所示各电路对正弦交流信号有无放大作用， 为什么, anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership (b) 不能正常放大 (a) 不能正常放大 解: (?)交流信号短路到地，(?)，无法建立合适U,0B 无法加到发射结。 的静态工作点，导致输出波 (?)从直流通路看 形失真。 U,U(?)没有接，而是接RUCCBEbCC I, BQRB U0CC I地。,,,0 BQ当R,0,I,,，电流过大，RRBBQbb 管子过热烧毁。 R(d) 可以正常放大，只要 (c) 不能正常放大 b RR,0,u,常数选取适当。 (?)?cCCE U无交流信号电压输出。 CC I,(?)有偏流 BQRb (?)无电压放大只有电流 u(?)交流信号可以加到输i Ie A,,(1，,)放大 iI入端输进放大。 B I(?)偏流正常 BQanti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 2.4 画出图2-51所示各放大电路的直流通路、 交流通路和微变等效电路。 图 2-51 解: 2.5 标明图2-52电路中静态工作电流I、 I、 I的实际方向; 静BCE 态压降U、 U和电源电压的极性; 耦合电容和旁路电容的极性。 BECE 解: 图2-52 2.6 分压式射极偏置电路如图2-53所示。 已知: U=12 V， R=51 CCb1kΩ， R=10 kΩ， R=3 kΩ， R=1 kΩ， β=80， 三极管的发射b2ce 结压降为0.7 V， 试计算: (1)放大电路的静态工作点I和U的数值; CCE anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership (2)将三极管V替换为β=100的三极管后，静态I和U有何变化, CCE(3)若要求I=1.8 mA， 应如何调整R。 Cb1 图2-53 解: R102b(1)U,，U,，12,2V BCCR，R51，1012bb UU,2,0.7BBEI ,,,1.3mA ER1Ke I1.3E ,,,16μAIB1，,1，80 I,I,1.283mA CE U,V,I(R，R),12,1.3(3KΩ，1K),6.84V CECCCCe (2)若β=100，静态I和U不会变化(?分压式放大电路，I的CCEC U,UBBEI,I,,1.3mA大小与β的大小无关，)静态工作点不移动。 CERe UU,2.5,0.7BBEII,,,,1.8mA，(3)若要求I= 1.8mA，则 C CER1Ke R10b2U,，U,，12,2.5,R,38KΩ U=2.5V， b BCCb1R，RR，10b1b2b1anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 将R由51KΩ调整为38KΩ。 b1 2.7 共发射极放大电路如图2-54所示。已知 -U=,16V，R=120kCCbΩ，R=1.5 kΩ，β=40， 三极管的发射结压降为0.7 V，试计算: C (1) 静态工作点; (2) 若将电路中的三极管用一个β值为100的三极管代替， 能否提高电路的放大能力， 为什么, 图 2-54 解: (1) 静态工作点 U15.3VCCI,,,0.1275mA bR120KΩb I,βI,5.1mA Cb U,U,IR,(16,5.1，1.5),8.35V CECCCC (2) 若β=100， I,0.1275mAI,β，I,12.75mAU,(16,12.75，1.5),,3.125V则,, bCbCE 管子处于深度饱和状态，因为β=100，I增加使U?，不仅下CCE降到0，而且变负，这使U> 0，令管子处于过饱和状态。 BC anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 2.8 某三极管共发射极放大电路的u波形如图2-55所示， 判断该CE 三极管是NPN管还是PNP管,波形中的直流成分是多少,正弦交流信号的峰值是多少, 解:该三极管是PNP管 波形中直流成分是-4V 正弦信号峰值是2V(?2V) 2.9 三极管放大电路与三极管的输出特性 图 2-55 曲线如图2-56所示， 忽略三极管的发射结电压。 (1) 用图解法求出三极管的静态工作点; (2) 若u=50 sinωt(mV)产生的基极电流为i=20 sinωtμA， 试()i b 在图2-56(b)中画出i和u的波形， 并求出输出电压的峰值和电CCE 压放大倍数; (3) 该电路的最大不失真输出电压幅度是多少, (4) 当接入5.1 kΩ的负载时， 电压放大倍数为多少,最大不失真幅度有何变化, 图 2-56 anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 解: (1) 用图解法求静态工作点 V12VCC， ， 根据 I,,,40μAU,U,IRBCECCCCR300KΩb当 i,0时，u,V,12VCCECC用两点法画直流负载线MN V12CC当 u,0,i,,,2.4mACECR5.1k1C其斜率 tg,,,RC I,1mACQ 直流负载线MN和 I,40μAb U,6.2VCEQ 的峰值为20μA?60μA ib 以Q点为中心，MN和的输出特性曲线交点即是静态工作点I,40,Ab Q点。 (2)放大倍数Au ，U2.1VoA ,,,,42u，U0.05Vi (3)最大不失真幅度:峰值2.15V 11-6.2=4.8V或6.2-0.7=5.5V 1,tg,,,(4)接入5.1 kΩ负载后，交流负载线AB变陡，斜率 ,RL ,R,R//R,2.55KΩ 最大不失真幅度变小，() LCL 峰值:1.2V 2.10 若将图2-56中的R改为570 kΩ， 重新图解放大电路的静态工b 作点。 当增大正弦输入信号， 使i=30 sinωt(μA)时， 电路将出b 现什么问题,画出对应的i和u波形。 CCE anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 12,0.711.3V解: I,,,20μA(19.8μA),(0.0000198A)b570KΩ570KΩ ,静态工作点是由直流负载线和的曲线相交于点， I,20μAQb 当增大正弦输入信号，使i=30 sinωt(μA)时，电路将 I,20μAbb 出现截止失真，波形出现削顶，如图2-56中所画出的和ui,tCE C 的削顶波形。 2.11 基本共发射极放大电路的静态工作点如图2-57所示， 由于电路中的什么参数发生了改变导致静态工作点从Q分别移动到Q、 Q、 012Q,(提示:电源电压、集电极电阻、基极偏置电阻的变化都会导致3 静态工作点的改变)。 图 2-57 解:若在工作点Q移到Q则R?(减小)，则I?(R不变) 01bbQC 从Q移到Q，则R?(增加)，使直流负载线斜率变平(R不变) 02Cb 从Q移到Q，则V?(减小)，R?(增加)，(R不变)即直流CC03bC ,V负载线斜率不变，把直流负载线平移到。 CC 2.12 图2-56(a)所示的共发射极放大电路的输出电压波形如图2-58 所示。 问: 分别发生了什么失真,该如何改善, 若PNP管构 成的基本共发射极放大电路的输出波形如图2-58所示， 发生的anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 是什么失真,如何改善, 图 2-58 解: (1) (a)发生了截止失真，输出U波形正半周削顶，应调整R?使IObb 增加静态工作点上移。 (b)产生了饱和失真，输出U波形负半周削底，应使 O ?R?，使I减小，脱离饱和区，静态工作点下移。 bb ?当R不变(即I不变)把R?使直负载线变陡使Q点往放bbQC 大区移动，脱离饱和区。 (c)发生了双重失真，在工作点合适的情况下，若输入信号过大，导致双重失真，改善办法增大电源电压V，或减小输入信号。 CC (2)若用PNP管构成基本共发射极放大电路，由于工作时采用直流负电源，所以非线形失真的波形与NPN型管正好相反。即输出电压u的波形顶部削波失真为饱和失真，底部削波失真为截止失真。其改o 善办法与(1)相同，即饱和失真用降低I(即加大R)，截止失真用bb 增加I(即减小R)的办法来改善波形。 bb 2.13 三极管单级共发射极放大电路如图2-59所示。 已知三极管参数anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership β=50， R=1 kΩ， 并忽略三极管的发射结压降， 其余参数如图中s 所示， 试计算: (1) 放大电路的静态工作点; (2) 电压放大倍数和源电压放大倍数， 并画出微变等效电路; (3) 放大电路的输入电阻和输出电阻; (4) 当放大电路的输出端接入6 kΩ的负载电阻R时， 电压放大L倍数和源电压放大倍数有何变化, 图 2-59 解: (1) 放大电路静态工作点 U12VCCI,,,30μA,0.03mA bQR400K,b I,βI,50，0.03,1.5mA CQbQ U,V,I,R,12,1.5，4,6V CEQCCCQC ，U,R50，4KOC，A,,,,,,,167(2) u，r1.184KUbei 26mVr,300，(1，,),300，884,,1184, () be1.5mA anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership ，RU1.18io， A,,,(,167),,90.4us，RRU，1，1.18sii () R,R//r,r,1.18K,R,R,4K，ibbebeoc (3) R,R//r,r,1.18K，，ibbebe R,R,4KΩoc RR,4，6CL,(4)RRR ,//,,,2.4KΩLCLRR,4，6CL ,R,50，2.4L，A ,,,,,,101.7u说明接入负载后，RLr1.18be ，，和都下降了。 AAR1.18uusi，， A,(A),，101.7,55.05usuR，R1，1.18is 2.14 分压式偏置电路如图2-60所示， 三极管的发射结电压为0.7 V。 试求放大电路的静态工作点、 电压放大倍数和输入、 输出电阻， 并画出微变等效电路。 图 2-60 解: (1) 由图2-60分压偏置电路求静态工作点。 R201bU,,V,，12,3V BQCCR，R20，6012bb anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership UUU,3V,0.7VEQBQBEO I,,,,1.15mAEQRR2Kee I,ICQEQ I1.15mAEQ I,,,0.0225mA,22.5mA,U,12,I(R，R),5.1VBQCEQCCE1，,51 26mVr,300，(1，,),300，51，22.6,300，1153,1453, be1.15 R,50，4C，A(2) ,,,,,,137.9Or1.45be , 接入负载R后， R,R//R,2KΩLLCL ,R,50，2L，A ,,,,,,70Or1..45be (3) R,R//r,15K//1..45K,1.322KΩ(R,R//R,60//20,15KΩ)iBbeBb1b2 R,R,4KΩOC 2.15 计算图2-61所示分压式射极偏置电路的电压放大倍数、 源电压 放大倍数和输入输出电阻。 已知信号源内阻R=500 Ω， 三极管的s电流放大系数β=50， 发射结压降为0.7 V。 图 2-61 anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 解: (1) 由直流通路 R102B V,,V,，12,2.796VBCCR，R10，3312BB VU,2.796,0.72.096BBE I,,,,1.5mAER1.4K1.4KE I1.5mAC ,,1.5mA,,,,30μAIIICEB,50 U,V,I(R，R),12,1.5(3.3，1.4),4.95VCECCCCE (2) 电压放大倍数的计算 由微变等效电路 ，,U,,RoL，A,, u，r，(1，,)RUbeE1i ,式中 ， R,R//R,3.3//5.1,2KΩR,R//R,33//10,7.67KΩLCLBB1B2 晶体管输入电阻 2626r ,,300，(1，,),300，(1，50),1184,1.184KΩbeI1.5E ,50，2K，(负号表示输出电压与输入反相) A,,,8.78u1.184K，(1，50)，0.2K R4.60Ki，，A,,A,，(,8.78),,7.75 (源电压放大倍数) usuR，R0.5，4.6si rr(3) 输入电阻和输出电阻仍由微变等效电路求 io U1irRRr,,,,////，(1，,)0.2K,,4.6KΩ ibbbe12111Ii，，R33101.184，(1，,)E r,R,3.3KΩ (由加压求流法求得) oC u,0,R 在开路的条件下求得 sC anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 2.16 图2-62所示分压式偏置电路中的热敏电阻具有负温度系数， 试判断这两个偏置电路能否起到稳定静态工作点的作用, 图 2-62 解:采用(a)图的接法是正确的，能起到稳定静态工作点的作用。这是因为:由于温度的升高，I，I，β都相应增大，导致I增大，CBOCEOC引起了静态工作点偏移，输出特性曲线上移，甚至进入饱和区使输出波形失真。使电路工作不稳定。 分压偏置电路除了R负反馈来稳定工作点的作用外，采用具有E 负温度系数的热敏电阻R来稳定静态工作点。在图2-62(a)的接法t 是正确的。 R2bV,，V因为 ， 当温度上升 I,,R,,V,,I,BCCEb2BER，R12bb V,VBBEI, ERE 图2-62(b)的接法不正确，不能起到稳定静态工作点的作用。 2.17 图2-32所示集电极—基极偏置电路中的U=16 V， 发射结压CC 降为0.7 V。 估算电路的静态工作点， 并温度升高时该电路稳定静态工作点的过程。 anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 图 2-32 解: V,V,R(I，I)CCCCBC V,V,R,I,I,βIBCCBbCb V,U,I,RCBEBB V,0.7V,R(I，I),0.7V,0.7,R(I，I,,)CCCCBCCCCBBI,,, BRRRBBB 15.3V15.3I,, ， I,R,15.3,R,I(1，β)BBBCBR，R(1，β)330K，10K(1，50)BC 15.3VI,,0.0182mA,18.2μA B840K I,βI,50，18.2,910μA,0.91mA CB ,63 U,V,(I，I)R,16,(18.2，910)，10，10，10,6.72VCECCBCC 温度升高稳定工作点过程: anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 2.18 三极管放大电路如图2-63所示， 已知三极管的发射结压降 为0.7 V， β=100， 试求: (1) 静态工作点; ，，UUoo12，，(2) 源电压放大倍数 V AA,和,usus12，，UUss(3) 输入电阻; (4) 输出电阻r和r。 o1o2 图 2-63 解: (1) 静态工作点 R152bU,，V,，10,4.29V BCCR，R20，1512bb UU,4.29,0.7BBEI,,,1.8mA ER2E I,I,1.8mA CE I1.8C I,,,0.018mA,18μABβ100 U,V,I(R，R),10,1.8(2，2),2.8V CECCCCE anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership R,R//R,10//15,8.57KΩBb1b2 26mV r,300，(1，100),1.75KΩbe1.8mA ,,,,r,R//r,R//r，(1，,)R,20//15//1.75，(1，100)，2,8.22KΩi1BiBbee (2) 源电压放大倍数 RR,,CC， A,,,,,1？(1，β)R,,ru1eberRR，(1，,)beeE r8.22i1， A,,A,,(,1),,0.804,,0.8us1u1R，r2，8.22Si1 R(1，,)e， A ,,1？(1，β)R,,ru2eberR，(1，,)bee r8.22i2， A,,A,，1,0.8us2u2R，r2，8.22Si2 (3) 输入和输出电阻 ,,r,R//R//r，(1，,)R,15//20//203.76,8.224KΩi1b1b2beE r,R,2KΩo1C , R,R//R,2KΩ//8.57,1.62K SSB ,，rR1.76K，1.62KbeS ,//,2KΩ//,33,rR2oE1，,1，100 2.19 共集电极放大电路如图2-64所示。 图中β=50， R=100 kΩ， bR=2 kΩ， R=2 kΩ， R=1 kΩ， U=12 V， U =0.7 V， 试求: eLsCCBE(1) 画出微变等效电路; (2) 电压放大倍数和源电压放大倍数; (3) 输入电阻和输出电阻。 anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 图 2-64 解: (1) 由直流通路图计算静态工作点 12,0.7 I,,0.056mA,56μAb100K，(1，50)，2K I,(1，,)I,(1，50)，0.056,2.86mAEb 26mVr,,300，(1，50),300，463.6,746.3,0.746KΩ be2.86mA (2) 画出微变等效电路如右图所示 (3) 求出电压放大倍数和源电压放大倍数 ，,UR(1，,)51，1oL，A ,,,,0.986,1 u，,rRU，(1，,)0.746，51beLi r34.1i，，A,,A,，0.986,0.976 usuR，r1，34.1Si r和r(4) 输入输出电阻() io ，Ui,r,,R//,,r，(1，,)R,100KΩ//(0.746KΩ，51KΩ),100//51.746,34.1KΩiBbeL，Ii ,，rR0.746，0.99beS ,//,2KΩ//,2000,//34,33.4,rRoE1，,1，50 ,R,R//R,1K//100K,0.99KΩ(其中) SSB anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 2.20 共发射极放大电路如图2-65所示， 图中β=100， U=0.7 V， BE R=1 kΩ， R=6 kΩ， C和C为耦合电容， 对交流输入信号短路。 sL12 (1) 为使发射极电流I=1 mA， R的值应取多少, Ee(2) 当I=1 mA时， 若使U=6 V， R的值是多少, ECc(3) 计算电路的源电压放大倍数。 图 2-65 解: (1) 设R,R,R,6KΩ ，U,18V ecLCE U,，15,(,15),30V ，U,U,2RI CCCCCEEE 30V,18V12VR 2,,,12K, ， R,6KΩEEI1mAE U,6V(2) 当I,1mA时， CE 30,6R,,12KΩ则 C2，1 26mAr,300，(1，100),300，2600,29KΩ(3) be1mA ,R,100(6//6)K300L，A,,,,,,,,10.34 uir29K29be rr29ibe，，A,A,A,，(,10.34),,10 usuiuir，Rr，R1，29iSbeS anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership (这是求U时，R被C交流短路) r,r，(1，,)R,r,29KΩo1E2ibeEbe ,() R,R//R,6KΩ//6KΩ,3KΩLCL 2.21 图2-42的电路参数如下:R,10 MΩ，R,30 kΩ，R,2 kΩ， gdsC,10μF，C,C2,0.01μF，U,18 V，场效应管的 U,-1 V， s1DDGS(off)I,1 mA。 试确定该电路的静态工作点。 DSS 图2-42 自给偏压电路 解:由于MOS管栅极电流为0，即R中电流为0，所以栅极电位g U,R,IU,0， SQSDQGQ U,U,U,0,I,R,,I,R (栅源静态电压) GSQGQSQDQSDQS UUGSQGS22I,I,,I,(1)(1) DDSSDSSUUGSoffGSoff()() U,,R,I,,2I GSQSDQD 联立解上述两方程: ,2I22DI,1,(1,),1,4I，4I DDD,1 12I,,0.25mA4I,1,0 当， 4I,5I，1,0DDDD4 I,1mA,I(4I,1)(I,1),0(I,1),0 当， DDSSDDD 相同不合理舍之 anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 取 I,0.25mADQ U,,0.25，2,,0.5VGSQ U,U,I(R，R),18,0.25(30，2),10VDSQDDDQdS 2.22 共源极场效应管放大电路如图2-66所示，已知场效应管工作点上的跨导g=0.8 mS，电路参数为R,300 kΩ，R,100 kΩ，Rmg1g2g,2 MΩ，R,2 kΩ，R,10 kΩ，R=10 kΩ，C,10 μF， C,s1s2ds1C,4.7μF，U,18 V。试求: 2DD (1) 电压放大倍数; (2) 输入电阻和输出电阻。 图2-66 解: ，(1) 共源极放大电路的放大倍数 Au ，，gUR,UgR,,0.8，10,8mgsdomd，A ,,,,,,,3.077,,3.08 u，，，gRUUgUR1，1，0.8，22.6，ms1igsmgss1 r(2) 输入电阻 i r,R，R//R,2000KΩ，(300K//100K),2075KΩ,2.075MΩ igg1g2 r(3) 输出电阻 o r,r,10KΩ od anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 2.23 计算图2-48所示场效应管放大电路的电压放大倍数、 输入电阻和输出电阻。已知场效应管工作点上的g=0.9 mS。 m 图2-48 共漏极放大电路——源极输出器 (a) 共漏极放大电路的电路图; (b) 微变等效电路 解: ，(1)电压放大倍数 Au ，，，,U,gU(R//R),gUR omgsSLmgsL ，，，，，,U,U，U,U，gU,R igsogsmgsL ，,UgR0.9，2.42.16omL，A ,,,,,0.68u，,gRU1，1，0.9，2.43.16mLi (2)输入电阻r i r,R，R//R,2MΩ，300KΩ//100KΩ,2.075MΩ igg1g2 r(3)输出电阻 o ，,UU1gsT,,r,,,r,r//R ， 而 ooos,I,gUgdmgsm 11？r,//R,//12KΩ,1.02K, osg0.9m anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership *2.24 源极输出器如图2-67所示， 已知U,2 V，I,4 mA。 试GS(th)DSS求: (1) 静态工作点的U和I; GSD (2) 静态工作点上的跨导g; m (3) 电压放大倍数; (4) 输入电阻和输出电阻。 解: (1)静态工作点和 UIGSD R2g U,，UU,IRGDDSDSR，R12gg R222g U,U,U,，U,IR,，15,4.7IGSGSDDDSDR，R33，2212gg …………………………………………………(1) U,6,4.7IGSD I和U应符合增强型MOS管上午电流方程，即 DQGSQ UGSQ2II ,(,1)……………………………………………(2) DQDOUGSth() UIGSQDQ(,1), 即， UIGS(th)DO UIi2,GSQDODg,,(,1) 而 mUUU,GSGS(th)GS(th)UDS,0 II22DQDOgII,, 即 mDODQUIU()()GSthDOGSth (1)，(2)式联立解二元方程(并舍去不合理的根)，得: 6,4.7I2I2，4mA2.82VDQDOg,(,1),(,1),1.64ms(毫,西) m2222anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership 22也可以从 g,I,I,4，0.677,1.64msmDODQU2()GSth (?当时，) U,2.82VI,0.677mAGSQPQ(舍去不合理的) U,0.965V,I,1.07mAGSQDQ ，电压放大倍数 Au ，，,, ， U,gURR,R//R,4.7K//4.7K,2.35KΩomgsLLSL ，，， U,U，Uigso ，，，,gUR,UUgR1.6，2.353.854mgsLoomL，A,,,,,,,0.794u，，，，，,,gRUUUUgUR1，1，1.6，2.354.854，，mLigsogsmgsL 输入电阻(见图2-68所示) ri r,R，(R//R),47MΩ，(22K//33K),47.013MΩigg1g2 输出电阻(见图2-69所示) ro ，，U,U11gsT,r ,,,,,609.75,o，，gIgU1.64ms,,mdmgs , r,r//R,609.75,//4700,,539.5,ooS anti-Japanese patriotism. Under the influence of the party, Zhu, Wang, acting in strict discipline, political, military quality and combat effectiveness has improved. As well as youth service corps, women's service and young pioneers, countryside-Japanese performance, posting anti-Japanese slogans, operate private schools, literacy classes, founder of the iron, and the tongue and the sound, sparks and other anti-Japanese mimeographed tabloid, actively promote anti-Japanese. Hanchang recovery after the party, that is, "Jiangnan anti-Japanese guerrilla people save," Shen Yingjie, Xu Azhen to participate in development of the Chinese Communist Party, in October and set up a water party group in Hong Kong, Han chang long party group. Meanwhile, Xu on cleaning two wannan, demanding new army deployed cadres, and have sent many new progressive youth to receive training. On November 9, sheng, Wu Xing, Nanxun, jiaxing, Tongxiang, Zonta, Hangzhou, wukang strongholds such as Elves, nearly all men, together with the aircraft, boats, Zhu Xi Lu, pouncing on troop locations. 10th, the enemies have invaded yan Tomb, Xin Cheng, Wuzhen. 11th, Zhu Xi army pier at Bell House was surrounded by the enemy, break, casualties will be great, CPC party member Xu, Xu Quansheng, really so magnificent and head of three Wang Yulin, also died in the battle. Zhu Xi withdrew the remnants of more than 400 people back to Xiao Feng integration. Jie Xu with the new cadres, Communist party Mr CHOW (Zhou kangyu) came from southern Anhui. Zhu Xi Wei CHOY for staff officers. The end of unified leadership