-③rbe?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+VCCC2+IEQ?ICQ??IBQ?1mAUCEQ?VCC?IEQRe?6.4VUi-+ReRL-Uo②rbe?300?(1??)RL=∞时，Au?26?2.93k?IEQ?1???Rerbe?(1??)Re?0.99?0.97RL=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??e1???1???P107RbC1+Rc+VCCC2C3ReRL习题2-17 Uo1?Rc??Uirbe?(1??)ReUo1Uo2Uo2(1??)Re?Uirbe?(1??)Re当Rc=Re时，Uo1??Uo2uituo1tuo2tUi-+UiRbrbeRe??Ib+-U+Ro1Uo2c--VCC=15VRb1=2.5k?RCRb2=10k?Rb2?UiUoReRLRc=3k?RL=3k?Rb1VCC解：①β=50CbRb1U?UBEQUBEQ=0.6VUBQ?VCC?3VRe?BQ?1.2k?Rb1?Rb2IEQrbb’=300?IBQ?ICQ??0.04mA?40?AI=2mA②ICQ?IEQ?2mAEQUCEQ?VCC?ICQRc?IEQRe?6.6V26?(Rc//RL)r?r?(1??)?963?③bebb?Au??77.8IEQrberRi?be?18.8?Ro?Rc?3k?1??习题2-18 P107C1C2习题2-19 P107解：(a)共基电路(b)共射电路(c)共集电路(d)共射电路(e)共射－共基电路习题2-20 P107Rd4iD/mA3VDD2105101520RguI+uO?iDuGS=3V2V1.5V1VuDS/VQ+-VGG-解：①直流负载线方程：uDS?VDD?iDRd?20?5.1iDUGSQ?2V,UDSQ?8.3V,IDQ?2.3mA?iDg??1.7mS②m?uGSRo?Rd?5.1k?③Au??gmRd??8.7VDD=20VVGG=2VRd=5.1k?Rg=10M?习题2-21 P108R2①Au= -gm(RD//RL) ?-22.5RC1Ri= RG+ (R1//R2) ?20 M?gR+o= RD=15 k?U②不接CiR1S 时，微变等效电路为-GDRgU?gsRmUgs1R2Sg?RdRLRsGDRgU?gsRgmU?gs1R2SRdRLRsUi?Ugs?IdRs?(1?gmRs)UgsUo??gmUgs(Rd//RL)?AUogm(Rd//RL)u?U??1?g??9imRsR+VdDDC2+RLUoRsCs-VDD=30VRd=15k?Rs=1k?Rg=20M?R1=30k?R2=200k?RL=1M?gm=1.5mSVDD=30VRd=15k?Rs=1k?Rg=20M?R1=30k?R2=200k?RL=1M?gm=1.5mS习题2-22 P109RguIVGGRsIDuOVDDUGS(th)=2VIDO=2mAVDD=20VVGG=4VRs=4.7k?Rg=1M?UGSQ?VGG?IDQRs2?UGSQ?IDQ?0.27mAIDQ?IDO??1??U??GS(th)?2gm?IDOIDQ?0.735mSUGS(th)微变等效电路GSRSUGSQ?2.73VuIgmUgsDuoUo?gmUgsRsUi?Ugs?Uo?(1?gmRs)UgsUogmRs?Au???0.776Ui1?gmRsUGS(th)=2VIDO=2mAVDD=20VVGG=4VRs=4.7k?Rg=1M?