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+// Exa 5.11
+format('v',5);
+clc;
+clear;
+close;
+// Given data
+gm=2;// in mA/V
+gm=gm*10^-3;// in A/V
+r_d= 40;// in kohm
+r_d= r_d*10^3;// in ohm
+Rs= 3;// in kohm
+Rs= Rs*10^3;// in ohm
+miu= gm*r_d;
+Bita=1;
+Av= miu*Rs/(r_d+Rs);
+D= 1+Bita*Av;
+Avf= Av/D;
+// Ri=infinite, so R_if = Ri*D = infinite
+Rof= r_d/D;// in ohm
+disp(Av,"Value of Av is : ")
+disp(D,"Value of D is ")
+disp(Avf,"Value of Avf is : ")
+disp("Value of R_if is ")
+disp("infinite")
+disp(Rof,"Value of Rof in ohm is : ")