习题2-12 上题中，如Rs=10k?，则电压放大倍数&U&Au?o??&Ui解：&URiAus?o?A??6.6&R?RuUiio习题2-13 在图P2-13的放大电路中，设三极管的β=100，UBEQ=-0.2V，rbb’=200?。①估算静态时的IBQ，ICQ和UCEQ；②计算三极管的rbe值；③求出中频时的电压放大倍数；④若输入正弦电压，输出电压波形为，试问三极管产生了截止失真还是饱和失真？应该调整电路中的哪个参数（增大还是减少）？-VCCRV?UBEQb-10V解：①IBQ?CC?20?A490k?RcC2Rb3k?C1IEQ?ICQ??IBQ?2mA++&UoRL&UCEQ?VCC?(?ICQRc)??4VUi_3k?_②rbe?rbb??(1??)③2626?200?101??1.5k?IEQ2&???(Rc//RL)??100④是截止失真，应减少RAubrbe习题2-14 在图P2-14的电路中，设β=50，UBEQ=0.6V。①求静态工作点；②画出放大电路的微变等效电路；③求电压放大倍数、输入电阻和输出电阻。+VCC解：①VCC?IBQRb?UBEQ?(1??)IBQRe+12VRbRc470k?C2VCC?UBEQ12?0.73.9k??IBQ???20?AC1Rb?(1??)Re470?51?2+RL&ReIEQ?ICQ??IBQ?1mAUi2k?3.9k?_UCEQ?VCC?ICQRc?IEQRe?6.1V②微变等效电路26?1.63k?③rbe?300?(1??)IEQ&???(Rc//RL)??0.94Aurbe?(1??)Re+&Uo_?UirbeRb??IbRLReRc?UoRi?Rb//??rbe??1???Re???84.9k?Ro?Rc?3.9k?习题2-15 设图P2-15中三极管的β=100, UBEQ=0.6V,rbb’=100?, VCC=10V, Rc=3k?, Re=1.8k?, RF=200?, Rb1=33k?, Rb2=100k?, 负载电阻RL=3k?，电容C1、C2、C3均足够大。①求静态工作点；②画出微变等效电路；③求电压放大倍数Au；④设RS=4k?，求AuS；+VCC⑤求Ri和Ro。Rb2Rb1Rc解：①UBQ?VCC?2.48VC2Rb1?Rb2C1ICQ?IEQ?UBQ?UBEQRF?Re?0.94mARs+Rb1Re+IBQ?ICQ??9.4?A&Us&+UiRF--RLCe&Uo-UCEQ?VCC?ICQRc?IEQ?RF?Re??5.3V②微变等效电路Rb?Rb1//Rb2Us+U?i&--Rs+Rbrbe?R?IbLRFRc?Uo③rbe?rbb??(1??)26?2.89k?IEQAu???(Rc//RL)??6.5rbe?(1??)RF④Ri?Rb1//Rb2//??rbe??1???RF???11.96k?Aus?RiAu??4.87Ri?RsRo?Rc?3k?习题2-16 P106解：①VCC?IBQRb?UBEQ?(1??)IBQRe?IBQ?VCC?UBEQRb?(1??)Re?10?ARbC1+VCCC2ReRL+IEQ?ICQ??IBQ?1mAUCEQ?VCC?IEQRe?6.4V&Ui-+&-Uo②rbe?300?(1??)26?2.93k?IEQ&?RL=∞时，Au?1???Rerbe?(1??)Re?0.99?0.97&?RL=1.2k?时，Au?1???Re//RLrbe?(1??)Re////RL③RL=∞时，Ri?Rb//??rbe??1???Re???283k?RL=1.2k?时，Ri?Rb//??rbe??1????Re//RL????87.6k?④?r?Rs??rbeRo??be//R??29??e?1???1??习题2-17 P107U&o1U&???Rcirbe?(1??)ReU&o2(1??)ReU&?irbe?(1??)Re当Rc=Re时，U&??U&uo1o2ituo1tuo2tR+VCCbCCR21cU&o1+C3U&U&o2iR-eRL+?I?+U&rbebiRbReU&+RU&o1--o2c-
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