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+// Example 8.2: Feedback triple

+// Consider the given three stage series-series feedback

+h_fe=100;

+g_m2=40*10^-3; // (A/V)

+r_e1=41.7; // (ohm)

+a_1=0.99; // alpha value

+R_C1=9000; // (ohm)

+R_E1=100; //(ohm)

+R_F=640; // (ohm)

+R_E2=100; //(ohm)

+r_pi2=h_fe/g_m2;

+R_C2=5000; // (ohm)

+r_e3=6.25; // (ohm)

+R_C3=800; //(ohm)

+// First stage gain A_1=V_c1/V_i

+A_1=-a_1*R_C1*r_pi2/((R_C1+r_pi2)*(r_e1+((R_E1*(R_F+R_E2))/(R_E1+R_F+R_E2)))) 

+disp(A_1,"The voltage gain of the first stage (V/V)")

+// Gain of the second stage A_2=Vc2/V_c1

+A_2=-g_m2*{(R_C2*(h_fe+1)/(R_C2+h_fe+1))*[r_e3+(R_E2*(R_F+R_E1))/(R_E2+R_F+R_E1)]}

+disp(A_2,"The second stage gain (V/V)")

+// Third stage gain A_3 I_O/V_i

+A_3=1/(r_e3+(R_E2*(R_F+R_E1)/(R_E2+R_F+R_E1)));

+disp(A_3,"The third stage gain (V/V)")

+A=A_1*A_2*A_3; // combined gain

+disp(A,"Combined gain (V/V)")

+B=R_E1*R_E2/(R_E2+R_F+R_E1);

+disp(B,"Beta value")

+A_f=A/(1+A*B);

+disp(A_f,"Closed loop gain (A/V)")

+A_v=-A_f*R_C3; // Voltage gain

+disp(A_v,"Voltage gain (V/V)")

+R_i=(h_fe+1)*(r_e1+(R_E1*(R_F+R_E2))/(R_E1+R_F+R_E2));

+R_if=R_i*(1+A*B);

+disp(R_if,"Input resistance (ohm)")

+R_o=(R_E2*(R_F+R_E1)/(R_F+R_E1+R_E2))+r_e3+R_C2/(h_fe+1);

+R_of=R_o*(1+A*B);

+disp(R_of,"Output voltage (ohm)")

+r_o=25000; // (ohm)

+g_m3=160*10^-3; // (mho)

+r_pi3=625; // (ohm)

+R_out=r_o+(1+g_m3*r_o)*R_of*r_pi3/(R_of+r_pi3);

+disp(R_out,"R_out (ohm)")
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