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+// Exa 5.4
+clc;
+clear;
+close;
+// Given data
+I_CQ = 5;// in mA
+I_CQ = I_CQ * 10^-3;// in A
+V_VEQ = 10;// in V
+h_ie = 600;// in ohm
+h_fe = 100;
+C_C = 3;// in pF
+C_C = C_C * 10^-12;// in F
+Ai = 10;// Ai(f)
+f = 10;// in MHz
+// Ai = h_fe/( sqrt( 1 + ((f/f_Beta)^2) ) );
+f_Beta = f/(sqrt( ((h_fe/Ai)^2) - 1 ));// in MHz
+disp(f_Beta,"The Beta cut off frequency in MHz is");
+f_T = h_fe*f_Beta;// in MHz
+disp(f_T,"The gain bandwidth product in MHz is");
+g_m = 0.1923;
+Ce = g_m/(2*%pi*f_T*10^6);// in F
+disp(Ce,"The value of Ce in F is");
+Cbe= Ce;// in F
+disp(Cbe*10^12,"The value of C_b''e in pF is : ")
+r_be = h_fe/g_m;// in ohm
+disp(r_be,"The value of r_b''e in ohm is");
+r_bb = h_ie - r_be;// in ohm
+disp(r_bb,"The value of r_bb'' in ohm is");