模拟电子技术习题(部分)教材:《模拟电子技术基础》(第四版)华中理工大学康华光主编第二章习题解答晶体管器件A:D导通,VAO=-6VB:D截止,VAO=-12VC:D1导通,D2截止,VAO=0VD:D1截止,D2导通,VAO=-6V习题2.4.3习题2.4.4解题的原则:先断开二极管,计算二极管连接点的电位高低。A:VA=1V,VB=3.5V,D截止B:VA=1V,VB=1.5V,D截止C:VA=1V,VB=0.5V,D临界状态习题2.4.5A:B:习题2.4.6习题2.4.8习题2.4.12习题2.5.1第三章习题解答基本放大电路模拟电子习题3P1403.1.1解题要点:先确定发射结(三极管放大,则正向电压0.2——0.3V或0.6——0.7V)及集电极,就可以知道管子的材料及类型。在本题中:A:为集电极且电位最低,所以管子是PNP型,B——发射极,C——基极,三极管是锗材料。习题3.1.2•三极管各极电流关系:IE=IC+IB•所以,A为集电极,B为基极,C为发射极。管子为NPN型,习题3.1.41.IC=PCM/VCE=15mA2.若IC=1mA,则VCE不得超过30V。习题3.2.11.不能放大,电源接反、发射结短路。2.能。3.不能,Rb接错。4.不能,VCC接反习题3.2.21.A位置:IB=(12-0.6)/40K=0.285mA,IC=22.8mA,VCE0V,因此管子饱和,实际IC=3mA2.B位置:IB=(12-0.6)/500K=0.0228mA,IC=1.824mA,VCE=4.7V,管子工作在放大区。3.C位置:发射结反偏,截止,IC=0。习题3.3.2•(a):放大。•(b):放大。•(c):饱和。•(d):截止。•(e):饱和。习题3.3.61.VCC=6V,IBQ=20µA,ICQ=1mA,VCE=3V;2.Rb=(VCC-0.7)/IBQ=265K(≈300K),RC=(VCC-VCE)/ICQ=3K;3.Vom=1.5V,4.ibMAX=20µA习题3.4.21.IBQ=0.04mA,ICQ=2mA,VCEQ=4V2.H参数等效电路3.rbe=300+26×β/ICQ=9504.AV=-50×RL’/rbe=-1055.AVS=-AVRi/(Ri+RS)=-68.8习题3.4.3IB=IC/β=1mA/20=0.05mA,Rb=12V/0.05mA=240K,rbe=300+26β/ICQ=820,|AV|=βRC/rbe=100,得RC=4.1K。VCE=12V-1mA×4.1K=7.9V习题3.4.41.计算Q点:IBQ=-(12V-0.7)/0.3M=-0.038mAICQ=-0.038β=-3.8mA,VCEQ=-4.4V2.H参数等效电路,图中rbe=9843.AV=-100×RL’/rbe,Ri=Rb//rbe≈rbe,Ro=2K4.截止失真,减小RB习题3.4.51.IBQ=(VCC-VBE)/R1,ICQ=βIBQ,VCEQ=VCC-ICQ(R2+R3)2.AV=-βRL’/rbe,式中RL’=R2//RLRi=R1//rbeRo=R23.C3开路,AV,Ro都增大习题3.5.11.IBQ=(12-0.7)/750K=15µA,ICQ=0.015×60=0.9mA,VCEQ=12-0.9×6.8=5.88V;2.75度时,β=75,VBE=0.6V,IBQ=(12-0.6)/750K=15.2µA,ICQ=0.0152×75=1.14mA,VCEQ=12-1.14×6.8=4.25V;3.β=115,IBQ=15,ICQ=1.725mA,VCEQ=0.27V,饱和习题3.5.41.VBE=10×Rb2/(Rb1+Rb2)=4.28V,IEQ≈ICQ=(4.28-0.7)/2K=1.79mA,VCEQ=10-1.79×(2K+2K)=2.84V,2.rbe=1.75KΩ,AV1=-[ri/(ri+RS)]×βRL’/[rbe+(1+β)Re]=-0.98×[ri/(ri+RS)],AV2≈ri/(ri+RS)3.ri=Rb1//Rb2//(rbe+101×2K)≈8.5KΩ,4.Ro1=2K,Ro2=[(RS//Rb1//Rb2+rbe)/(1+β)]//Re习题3.6.21.IBQ=(12-0.7)/(Rb+51×Re)=21.7µA,ICQ=βIBQ=1.086mA,VCEQ=-6.5V,rbe=1.5K2.AV≈1,Ri=Rb//(rbe+51Re//RL)≈90K,Ro=Re//[(RS//Rb+rbe)/(1+β)]=39Ω3.Vo=[Ri/(Ri+Ro)]×Av×Vs≈200mV习题3.7.11.|AVM|=60db=1000(倍),fL=100Hz,fH=100MHz2.f=fH=fL时,|AVM|=57db第五章习题解答功率放大器P220习题5.2.2(1):POM=VCC2/2RL=4.5W(2):PCM≥0.2POM=O.9W(3):每个管子的耐压:V(BR)ceo≥24V习题5.2.3(1):POM=VCC2/2RL≥9W∴VCC≥12V(2):ICM≥1.5A,|V(RB)CEO|≥24V(3):PV=2VCC2/(RL)=11.5W(4):PCM≥1.8W(5):Ui=8.5V习题5.2.4(1)(2)%5.555.2210)4(25.1222WPPPWVVVRPWRVPTOVOMCCLTLOOOM%5.788.318.625WPWPWPVTO习题5.3.1单电源功放的功率计算:∴POM=9W,则VCC≥24VLomRVPCC82习题5.3.2WRVPLomCC25.28812822习题5.3.31.静态时C2的电压6V,调R12.增大R23.损坏T1,T2习题5.4.21.此电路属于OCL功放2.POM=152/(28)=14W3.=78.5%第六章习题解答差动放大器与集成运放第六章习题P270习题6.2.1解:(1)2560016.01.52.9VsVoAVmVVio34.22561.55.4(2)习题6.2.31.Io=2mA,Ic1=Ic2=1mA,IB1=Ic1/β=10μA,Vce=5V2.Vo=AVD×(vi1-vi2)=-860mV,式中:3.RL=5.6K:43)1(1ebecVDRrRAmVvvRrRRviiebeLco288)()1()2//(214.Rid=2[rbe+(1+)Re1]=26KRic=[rbe+(1+)Re]/2+(1+)ro=10MRo=11.2K习题6.2.41.RL=∞,vo2=0.02×AVD/2=430mVRL=5.6K,Vo2’=215mV2.AVD2=21.5)(8.572.776||0277.0)2)(1(22dbAAKrRrRAVCVDCMRoebeCvc3.Rid=26K,Ric≈10M,Ro2=5.6K习题6.2.71.求Q点VR2=9V[3K/(3K+5.6K)]=3.14V,Ic3=2mA,Ic2=Ic1=1mA,VceQ=5V,rbe1=rbe2=1.6K,RAB=3118K2.0005.0)2)(1(//75.11])1([2//22ABebeSCLvcebeSLcvdRRrRRRARrRRRAKRKRrRRdbKOebesidCMR7.46.13)1([2)(87230001习题6.2.81.求Q:IC3=1mA,VB3=9V,VC2=8.3V,IE=2IC2=0.74mA,IC2=0.37mA,VCEQ3=-9V,VCEQ2=9V,Re2=5.27K,rbe1=rbe2=300+26×(1+β)/2=3.9K,rbe3=2.4K,ri3=rbe3+(1+β)Re3=245K2.AV191])1([)(2//3333132ebecbebiCVRrRrRrRA3.Vi=5mV,Vo=-955mV4.AV’=-95.5第七章习题解答反馈放大器(a):电压并联交直流负反馈,反馈元件R2习题7.1.1,7.1.2(P314)(b):Rf1,Rf2,C电压并联直流负反馈Re1电流串联交直流负反馈习题7.1.1,7.1.2(P314)•(c):Rf,Re2电流并联交直流负反馈习题7.1.1,7.1.2(P314)(d):R1,R2电压串联交直流负反馈习题7.1.1,7.1.2(P314)(e):A2,R3电压并联交直流负反馈习题7.1.1,7.1.2(P314)习题7.1.1,7.1.2(P314)(f):R6电流串联交直流负反馈习题7.1.3•对于并联负反馈,Rs要求越大越好;对于串联负反馈Rs要越小越好;因此,(a):Rs要小,(b):Rs要大(a)(b)习题7.1.41.Rf1引入电流串联负反馈,使rif提高,Rf2引入电压并联负反馈,使rif降低。2.拆去Rf2虽然可提高输入电阻,但整体性能下降,解决的办法是将Rf2的左端改接到T2集电极。习题7.1.5•(a):不可能,因为是正反馈,应交换运放正负极。•(b):不能,应交换R和RL•(a)(b)习题7.1.6(1):反馈类型:电流并联负反馈。(2):输出电流的计算13232323323)1()1(1,RuRRIAIRRFARRRIIFRRRIIiiiifoiifofiiof(3):该电路为压控电流源习题7.1.6习题7.1.7(1):电压串联负反馈:i----h,j----f,d----GND,a----c习题7.2.1电路看成电压串联负反馈201AFAAvvf若Vo=2V,则Vi=100mV,Vf=99mV,Vid=1mV习题7.4.1电路为电压串联负反馈,ri很高,ro很低6565665611RRFARRRvvFRRRvvvvfofvvof第八章习题解答运放的应用习题8.1.1P37521321321122121211221213:)1)(()1(ssoffssosspfpOvvvRRRRRRRRRvRRRvvRRRvRRRvvRRvv=时当习题8.1.2VRRvRRvvVvvRRvfofsossfo8.1)()1(2.1222122211111习题8.1.4A1、A2为电压跟随器VvVvoo4;321VRRRRRRVRRvRRvvooo5)//1(2135453232131习题8.1.5A1、A2、A3、A4均为电压跟随器33;22;11vvvvvvooo)(=,时==当32132112312331231232132131////////////oooooooovvvvRRRRRRRRvRRRRRvRRRRRvv习题8.1.822)2121()(2,211212121221RRvRRvvvRRvRRRvvvvvvIIoooIBoIAo习题8.1.9Vs=I1R1,I1=I2Vm=-I2R2=-I1R2=-VSR2/R1I4=VM/R4=-R2VS/(R1R4)=I1R2/R4VO=-I3R3+VM=-(I1+I4)R3+VM=-I1(1+R2/R4)R3-I1R2=-(R2+R3+R2R3/R4)VS/R1VO/VS=-(R2+R3+R2R3/R4)/R1习题8.1.10(1):(2):VtCRvdtvCRvsso5111习题8.1.19(3):功能:(2):波形图(1):输入——输出特性取绝对值运算、小信号整流。第九章习题解答波形发生器习题9.2.1p429(a):不能,因为是反相放大器(b):能习题9.2.2(1):能。(2):Rf≧2Re1,f=1/2RC=58.5Hz(3):Re1正温度系数,Rf