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+// Example 11.4
+format('v',5)
+clc;
+clear;
+close;
+// given data
+h_fe= 120;// unit less
+h_ie= 3.5*10^3;//in Ω
+r_L= 2*10^3;// in Ω
+h_oe= 8.5*10^-6;// in S
+h_re= 1.3*10^-4;// unit less
+// The voltage gain 
+A= h_fe*r_L/(h_ie*(1+h_oe*r_L)-h_re*h_fe*r_L)
+disp(A,"The voltage gain is : ")