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+// Example1.4 : Bipolar junction transistor

+

+// 1,4a

+// using voltage divider rule the fraction of input signal v_be=v_s*r_pi/(r_pi+R_s)

+// output voltage v_o=-g_mv_be(R_L||r_o)

+r_pi=2.5*10^3; // (ohm)

+R_s=5*10^3; // (ohm)

+R_L=5*10^3 // (ohm)

+g_m=40*10^-3; // (mho)

+r_o=100*10^3; // (ohm)

+gain=-(r_pi*g_m*(R_L*r_o/(R_L+r_o)))/(r_pi+R_s); // gain=v_o/v_s

+disp(gain,"The voltage gain (V/V) =")

+gain_negl_r_o=-r_pi*g_m*R_L/(r_pi+R_s);

+disp(gain_negl_r_o,"Gain neglecting the effect of r_o (V/V) =")

+

+// 1.4b

+// Bi_b=g_m*v_be

+// B is short circuit gain

+B=g_m*r_pi;

+disp(B,"The short circuit gain (A/A) =")
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