哈工程數(shù)字信號(hào)處理實(shí)驗(yàn)報(bào)告7

數(shù)字信號(hào)處理實(shí)驗(yàn)實(shí)驗(yàn)七：小信號(hào)放大器性能分析與仿真班級(jí)：姓名：學(xué)號(hào)：指導(dǎo)老師：2010年11月實(shí)驗(yàn)七：小信號(hào)放大器性能分析與仿真實(shí)驗(yàn)原理小信號(hào)放大器是電子線路的重要組成部分之一，由于它工作在晶體管的線性區(qū)域內(nèi)，因此又稱(chēng)為線性放大器。使用MATLAB可以仿真小信號(hào)放大器的各種參數(shù)，如電壓增益.輸出阻抗.輸入阻抗.頻率響應(yīng)等。二．實(shí)驗(yàn)內(nèi)容3.7.2function[Av,Zi,Zo,Ie,Vb,Vc,vo]=amplif1(Rb1,Rb2,Rc,Re,RL,h,Rs,vs,beta,Ec,Kp);ifnargin<11;Kp=1;end;ifnargin<10;Ec=12;end;ifnargin<9;beta=50;end;ifnargin<8;vs=10e-03;end;ifnargin<7;Rs=1e+03;end;ifnargin<6;h=[1.2e+033.37e-4;5027.1e-6];end;ifnargin<5;RL=6e+03;end;ifnargin<4;Re=1.5e+03;end;ifnargin<3;Rc=2e+03;end;ifnargin<2;Rb2=6e+03;end;ifnargin<1;Rb1=24e+03;end;Rb=Rb1*Rb2/(Rb1+Rb2);YL=(Rc+RL)/(Rc*RL);Rs1=Rs*Rb/(Rs+Rb);Zi=h(1,1)-h(2,1)*h(1,2)/(YL+h(2,2));Z1=Zi*Rb/(Zi+Rb);vb=vs*Z1/(Z1+Rs);ib=vb/Zi;Ro=1/h(2,2);ic=h(2,1)*ib*Ro/(Ro+1/YL);vo=-ic/YL;Av=vo/vb;formatshort;Yo=h(2,2)-h(2,1)*h(1,2)/(h(1,1)+Rs1)+1/Rc;Zo=1/Yo;Zi=round(Zi);Zo=round(Zo);Av=round(Av*10)*.1;ifKp==1;Vbe=.6;ns='Si';else;Vbe=.2;ns='Ge';end;A=[(Rb1+Rb2)/Rb2Rb1;1Rb+(1+beta)*Re];B=inv(A)*[EcVbe]';Vb=B(1);Ib=B(2);Ie=(1+beta)*Ib;Vc=Ec-beta*Ib*Rc;Vb=round(Vb*10)*.1;Vc=round(Vc*10)*.1;Ie=round(Ie*1e+04)*.1;Kp=2;Rc=8*10^3;Ec=10;beta=80;vs=10^-3;h=[1.2e+033.37e-4;5027.1e-6];Rb1=5*10^3;Rb2=10^3;Re=10^3;RL=5*10^3;Rs=500;[Av,Zi,Zo,Ie,Vb,Vc,vo]=amplif1(Rb1,Rb2,Rc,Re,RL,h,Rs,vs,beta,Ec,Kp)實(shí)驗(yàn)結(jié)果：Av=-123.3000Zi=1152Zo=7094Ie=-1.5000Vb=1.7000Vc=21.6000vo=-0.06063.7.3function[Av,Zi,Zo,Vb,Ie,E,vo]=amplif2(Rb1,Re1,Rc1,R1,R2,Rc2,Re3,Rf,h,vs,beta,Ec,Ed,Kp);ifnargin<14;Kp=1;end;ifnargin<13;Ed=15;end;ifnargin<12;Ec=24;end;ifnargin<11;beta=50;end;ifnargin<10;vs=1e-03;end;ifnargin<9;h=[1.2e+033.37e-4;8027.1e-6];end;ifnargin<8;Rf=33e+03;end;ifnargin<7;Re3=3.3e+03;end;ifnargin<6;Rc2=18e+03;end;ifnargin<5;R2=3.9e+03;end;ifnargin<4;R1=130;end;ifnargin<3;Rc1=100e+03;end;ifnargin<2;Re1=100;end;ifnargin<1;Rb1=1000e+03;end;hie=h(1,1);hfe=h(2,1);hoe=h(2,2);Rc=hie*Rc1/(hie+Rc1);T=[hoe+1/Re1-hoe-1-hfe;-hoehoe+1/Rchfe;10hie];V=inv(T)*[00vs]';v2=V(2);ib2=v2/hie;Av1=v2/vs;Zi=vs/V(3);Re=Re3/hoe/(Re3+1/hoe);Rc=Rc2/hoe/(Rc2+1/hoe);T=[1/Re-1-hfe;1hie+Rc];V=inv(T)*[0-hfe*Rc*ib2]';Av2=V(1)/v2;Av0=V(1)/vs;Zo=V(1)/((1+hfe)*hfe*Rc*ib2/(Rc+hie));Zo=abs(Zo);B=Re1/(Rf+Re1);F=1+Av0*B;Av=Av0/F;Zi=Zi*F;Zi=Zi*Rb1/(Zi+Rb1);Zo=Zo/F;vo=Av*vs;Av=[AvAv0Av1Av2];ifKp==1;Vbe=.7;ns='Si';else;Vbe=.2;ns='Ge';end;Z=[Rb1+R2+(1+beta)*Re1-(1+beta)*R2;beta*Rc1-R2Rc1+(1+beta)*(R1+R2)];Ib=inv(Z)*[-VbeEd-Vbe]';I1=(1+beta)*Ib(1);I2=(1+beta)*Ib(2);I3=(1+beta).*(Ec-Vbe-Rc2*beta*Ib(2))/(Rc2+(1+beta)*Re3);I=[I1I2I3];I=round(I*1e+04)*.1;V=[Re1*I1(R1+R2)*I2Re3*I3]+Vbe;V=round(V*10)*.1;Zi=round(Zi);Zo=round(Zo);Av=round(Av);E=[EcEd];Vb=V;Ie=I;formatshort;[Av,Zi,Zo,Vb,Ie,E,vo]=amplif2(10^6,125,10^5,350,4*10^3,2*10^4,3*10^3,3*10^4,[1.2e+033.37e-4;8027.1e-6],10^-3,75,24,12,1)實(shí)驗(yàn)結(jié)果：Av=2411186965-8-142295Zi=981850Zo=6Vb=0.70002.700013.6000Ie=0.10000.50004.3000E=2412vo=0.24103.7.4function[av,zi,zo,V,I,vo]=amplif3(rb,rc,re,r1,r2,r3,r4,re3,zee,h,vs,beta,ec,kp);ifnargin<14;kp=1;end;ifnargin<13;ec=12;end;ifnargin<12;beta=1;end;ifnargin<11;vs=10e-03;end;ifnargin<10;h=[1.2e+033.37e-4;10027.1e-6];end;ifnargin<9;zee=1e+05;end;ifnargin<8;re3=3300;end;ifnargin<7;r4=47;end;ifnargin<6;r3=680;end;ifnargin<5;r2=2400;end;ifnargin<4;r1=4800;end;ifnargin<3;re=68;end;ifnargin<2;rc=560;end;ifnargin<1;rb=4700;end;hie=h(1,1);hfe=h(2,1);hoe=h(2,2);A=[10000hie0;001000hie;];A=[A;(1+re*hoe)-re*hoe00-1-(1+hfe)*re0];A=[A;00(1+re*hoe)-re*hoe-10-(1+hfe)*re];A=[A;zee0zee0-(2*zee+re)00];A=[A;rc*hoe-(1+rc*hoe)000-hfe*rc0];A=[A;00rc*hoe-(1+rc*hoe)00-hfe*rc];V=inv(A)*[vs000000]';vo=[V(2)V(4)];av=vo/vs;av=round(av*10)*0.1;rb1=1/(1/rb+1/r2+1/r1);zi=vs/V(6);zi=zi*rb1/(zi+rb1);zo=(rc+hie)/(1+hfe);zo=round(zo);zi=round(zi);ifkp==1;vbe=0.8;ns='Si';else;vbe=0.2;ns='Ge';end;A=[(r1+r2+r3)/r3r1+r2r2;1-(1+beta)*r40;0beta-2*(1+beta)];B=inv(A)*[ec+(r1+r2)/r3*vbevbe0]';formatshort;V=[B(1)ec\r1*((B(1)-vbe)/r3+B(2)+B(3))-rb*B(3)ec-beta*B(3)*rc];I=[B(3)*(1+beta)(V(3)-vbe)/re3];I=round(I*1e+04)*0.1;[av,zi,zo,V,I,vo]=amplif3(5*10^3,600,100,6*10^3,2500,700,50,3.5*10^3,10^5,[1.2e+033.37e-4;10027.1e-6],10^-3,50,12,1)實(shí)驗(yàn)結(jié)果：av=-2.70002.6000zi=1232zo=18V=1.46050.02998.1909I=6.50002.1000vo=-0.00270.00263.7.5function[H,Zi]=amplif4(Ce,C1,C2,Rb1,Rb2,Rc,Re,RL,h,Rs);ifnargin<10;Rs=1e+03;end;ifnargin<9;h=[1.2e+033.37e-4;5027.1e-6];end;ifnargin<8;RL=6e+03;end;ifnargin<7;Re=1.5e+03;end;ifnargin<6;Rc=2e+03;end;ifnargin<5;Rb2=6e+03;end;ifnargin<4;Rb1=24e+03;end;ifnargin<3;C2=24e-06;end;ifnargin<2;C1=24e-06;end;ifnargin<1;Ce=200e-06;end;symss;hie=h(1,1);hfe=h(2,1);hoe=h(2,2);zt=[hie0;-hfe/hoe1/hoe];ze=Re/(1+s*Re*Ce);ze=ones(2,2)*ze;Z=zt+ze;A=[Z(1,1)det(Z);1Z(2,2)]/Z(2,1);Rb=Rb1*Rb2/(Rb1+Rb2);A=[1Rs+1/s/C1;01]*[10;1/Rb1]*A*[10;1/Rc1]*[11/s/C2;01];A=A*[10;1/RL1];Zi=A(1,1)/A(2,1)-Rs;f=logspace(1,5,101);[b,a]=numden(Zi);b=sym2poly(b);a=sym2poly(a);Zi=freqs(b,a,2*pi*f);k=max(abs(Zi+Rs)./Zi);H=k/A(1,1);[b,a]=numden(H);b=sym2poly(b);a=sym2poly(a);H=freqs(b,a,2*pi*f);Av=20*log10(abs(H));Avm=round(max(Av)*10)*.1;subplot(211);semilogx(f,Av);grid;zoomxon;xlabel('req