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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");