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+// Exa 5.5
+clc;
+clear;
+close;
+// Given data
+f_T = 400;// in MHz
+D_Beta = 13;// in cm^2/sec
+//Ce = (g_m*(W^2))/(2*D_B), so
+//f_T = (g_m/(2*%pi))*( (2*D_B)/(g_m*(W^2)) ) = D_B/(%pi*(W^2));
+W = sqrt( D_Beta/(%pi*f_T*10^6) );// in cm
+W = W * 10^4;// in µm
+disp(W,"The base width of silicon transistor in µm is");