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+// Example 14.11
+// A Cascode Amplifier
+R_s=2000;
+R_L=4000;
+T_a=[-10^-3 ,-20;-2*10^-6,-0.02]; // Given H parameters for Transistor a
+T_b=T_a; // Given H parameters for Transistor b
+T_ab=T_a*T_b;
+Z_i=(T_ab(1)*R_L+T_ab(3))/(T_ab(2)*R_L+T_ab(4));
+H_i=-1/(T_ab(2)*R_L+T_ab(4));
+A_i= (-R_s*H_i)/(R_s+Z_i);
+disp(A_i,"Gain of Cascade amplifier=")