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diff --git a/506/CH13/EX13.2.c/Example13_2c.sce b/506/CH13/EX13.2.c/Example13_2c.sce
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+clear;
+clc;
+
+//Caption:To find parameters of Current seris Fwwdback Amplifier
+//Given Data
+Gmf=-1;//Transconductance in mA/V
+D=50;//Desensivity
+Avf=-4;//Voltage Gain
+Rs=1;//in K
+hfe=150;
+Vt=0.026;//in V
+
+Gm=Gmf*D;
+
+//B=-Re, D = 1+B*Gm = 1-B*Gm
+Re=(1-D)/Gm;//in K
+
+Rl=Avf/Gmf;//in K
+
+// Gm= -hfe/(Rs+hie+Re)
+hie= -(hfe/Gm)-Rs-Re;
+Ri = Rs + hie +Re;
+Rif = Ri*D
+disp('K',Rif,'Rif=');
+
+
+//end
+\ No newline at end of file