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+// chapter 1
+//example 1.3
+// page no.18,figure no.1.22
+//given
+Rin1=100;Rin2=100;
+Re=2700;Rc=4700;
+Hfe=100;
+Hie=1000;Hoe=0;
+Aid=(Hfe*Rc)/(Rin1+Hie);
+disp(Aid)//differential gain
+//Acm=(2*Re*Hoe-Hfe)*Rc/(2*Re(1+Hfe)+(Rin1+Hie)(1+2*Re*Hoe)),and Hoe=0
+x=2*Re*1+2*Re*Hfe+Rin1+Hie;
+Acm=-(Hfe*Rc)/x;
+disp(Acm)//neglecting the negative value.taking mod of Acm
+Acm=-(Acm)
+CMRR=20*log10(Aid/Acm);
+disp(CMRR)//is in db
+Rin=2*Rin1+2*Hie;
+disp(Rin)//input resistance
+Ro=Rc
+disp(Ro)//output resistance
+\ No newline at end of file