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+// Example 6.13: Analysis of CC-CE amplifier

+// Consider a CC-CE amplifier

+// at an emitter bias current of 1mA for Q_1 and Q_2

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

+r_e=25; // (ohm)

+B=100; // beta value

+C_u=2*10^-12; // (F)

+f_T=400*10^6 // (Hz)

+r_pi= B/g_m; 

+disp(r_pi,"r_pi (ohm)")

+C_pi=g_m/(2*%pi*f_T)-C_u;

+disp(C_pi,"C_pi (F)")

+R_in2=2500; // (ohm)

+r_pi2=2500; // (ohm)

+r_pi1=2500; // (ohm)

+r_e1=0.025; // (ohm)

+B_1=100; // beta value

+R_in=(B_1+1)*(r_e1+R_in2);

+disp(R_in,"R_in (ohm)")

+R_sig=4*10^3; // (ohm)

+R_L=4000; // (ohm)

+Vb1byVsig=R_in/(R_in+R_sig); // (V_b1/V_sig)

+disp(Vb1byVsig,"(V_b1/V_sig) (V/V)")

+Vb2plusVb1=R_in2/(R_in2+r_e1); // (V_b2/V_b1)

+disp(Vb2plusVb1,"(V_b2/V_b1) (V/V)")

+VobyVb2=-g_m*R_L; // (V_o/V_b2)

+disp(VobyVb2,"(V_o/V_b2) (V/V)")

+A_M=VobyVb2*Vb2plusVb1*Vb2plusVb1;

+disp(A_M,"A_M (V/V)")

+R_u1=R_sig*R_in/(R_sig+R_in);

+disp(R_u1,"R_u1 (ohm)")

+R_pi1=(R_sig+R_in2)/(1+(R_sig/r_pi1)+(R_in2/r_e1)); // C_pi1 sees a resistance R_pi1

+disp(R_pi1,"R_pi1 (ohm)")

+R_out1=25+4000/101;

+R_pi2=R_in2*R_out1/(R_in2+R_out1); // C_pi2 sees a resistance R_pi2

+disp(R_pi2,"R_pi2 (ohm)")

+R_u2=(1+g_m*R_L)*R_pi2+R_L;

+disp(R_u2,"R_u2 (ohm)")

+C_u1=2*10^-12; // (F)

+R_u1=3940; // (ohm)

+C_pi1=13.9*10^-12; // (F)

+C_u2=2*10^-12; // (F)

+C_pi2=13.9*10^-12; // (F)

+T_H=C_u1*R_u1+C_pi1*R_pi1+C_u2*R_u2+C_pi2*R_pi2;

+disp(T_H,"T_H (s)")

+f_H=1/(2*%pi*T_H);

+disp(f_H,"f_H (Hz)")

+A_M=r_pi*(-g_m*R_L)/(r_pi+R_sig);

+disp(A_M,"A_M (V/V)")

+R_pi=r_pi*R_sig/(r_pi+R_sig); 

+disp(R_pi,"R_pi (ohm)")

+R_u=(1+g_m*R_L)*R_pi +R_L;

+disp(R_u,"R_u (ohm)")

+T_H=C_pi*R_pi+C_u*R_u;

+disp(T_H,"T_H (s)")

+f_H=1/(2*%pi*T_H);

+disp(f_H,"f_H (Hz)")
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