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+//chapter 12

+//example 12.2

+//page 364

+clear all;

+clc ;

+//given values in ohm

+Zi2=967;

+hfe1=100;

+R3=12000;

+hie1=1000;

+R9=150;

+hfe2=100;

+hie2=1000;

+R7=R3;

+RL=120*10^3;

+R10=R7;

+R1=RL;

+R2=39*10^3;

+//voltage gain of stage 1

+A1=-hfe1*(R3*Zi2/(R3+Zi2))/(hie1+R9*(1+hfe1));

+printf("\nvoltage gain of stage 1=%.1f",A1);

+//voltage gain of stage 2

+Rp=(1/R7)+(1/RL)+(1/R10);

+A2=-hfe2*(1/Rp)/hie2;

+printf("\nvoltage gain of stage 2=%d",A2);

+//open loop gain 

+A1=-5.5;A2=-571;

+M = (A1)*(A2) ;

+printf("\nopen loop gain =%d",M);

+//feedback factor

+B=R9 /(R9 + R10);

+b=B^-1;

+printf("\nfeedback factor(beta)=1/%d",b)

+Av1=1/B;//for M*beta >>1

+Av2=M/(1+M*B);//closed loop gain

+printf("\nclosed loop gain=%d or %d if M*beta >>1",ceil(Av2),Av1);

+Zb=hie1;

+Zin=(1+M*B)*Zb;

+//input impedance

+Zi=1/((1/Zin)+(1/R1)+(1/R2))*10^-3;

+printf("\ninput impedance=%d kohm",ceil(Zi));

+//output impedance 

+Zout=(R7*R10/(R7+R10))/(1+M*B);

+printf("\noutput impedance =%d ohm",ceil(Zout));

+XC1=Zi/10;

+f1=100;//Hz

+C1=10^3/(2*%pi *f1*XC1);

+printf("\ncapacitor C1=%.2f microF,use standard value 1 microF",C1)

+