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+clear;
+clc;
+//Example 12.15
+//Determine the loop gain fig12.45(a)
+hFE=100;
+Vbe=0.7;
+Icq=0.492;
+r=5.28;
+gm=18.9;
+Rs=10;
+R1=51;
+R2=5.5;
+Re=0.500;
+Rc=10;
+Rf=82;
+x=r*R2/(r+R2);
+y=R1*x/(x+R1);
+t=Rs*y/(y+Rs);
+Req=t;
+printf('\nequivalent resistance=%.2f KOhm\n',t)
+T=gm*Rc*Req/(Rc+Rf+Req);
+printf('\nthe loop gain=%.2f\n',T)