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+// Example 10.13: (a) fH for cascode amplifier
+//                (b) fH for common -emitter stage
+clc, clear
+RC1=1.5e3; // in ohms
+RC2=RC1;
+RS=300; // in ohms
+r_pi=2e3; // in ohms
+gm=0.05; // in mho
+bta=100;
+C_pi=19.5e-12; // in farads
+C_mu=0.5e-12; // in farads
+
+disp("Part (a)");
+R_pi1=RS*r_pi/(RS+r_pi); // in ohma
+Ri2=r_pi/(1+bta); // in ohms
+RL1=RC1*Ri2/(RC1+Ri2); // in ohms
+a11=R_pi1*C_pi+(R_pi1*(1+gm*RL1)+RL1)*C_mu; // in seconds
+a12=C_pi/gm+C_mu*RC2; // in seconds
+a1=a11+a12; // in seconds
+fH=1/(2*%pi*a1); // in hertz
+fH=fH*1e-6; // in Mega-hertz
+disp(fH,"fH for cascode amplifier (MHz) =");
+
+disp("Part (b)");
+a1=R_pi1*C_pi+(R_pi1*(1+gm*RC1)+RC1)*C_mu; // in seconds
+fH=1/(2*%pi*a1); // in hertz
+fH=fH*1e-6; // in Mega-hertz
+disp(fH,"fH for common-emitter stage (MHz) =");
+\ No newline at end of file