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+//chapter 10
+//example 10.4
+//page 296
+clear;
+clc ;
+//given
+R1=3.9 ; 
+R2=2.2;//in Mohm
+Rl=27;
+Rs=1.5;//in kohm
+gm=4 ;//mA/V
+Rg=R1*R2/(R1+R2);
+Zi=Rg;
+Rp=1/gm;//in kohm
+Zo=1000*(Rs*Rp)/(Rs+Rp);
+Av=(gm*((Rs*Rl)/(Rs+Rl)))/(1+gm*((Rs*Rl)/(Rs+Rl)));
+printf('\nZi=%.1f Mohm',Zi)
+printf('\nZo=%d ohm',Zo)
+printf('\nAv=%.2f ',Av)