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+// example:-11.7,page no.-625.
+// program to design an amplifier to have a gain of 11 dB at 4 GHZ.
+s11=0.75*expm(%i*(-120)*%pi/180);
+s21=2.5*expm(%i*(80)*%pi/180);
+s12=0;
+s22=0.6*expm(%i*(-70)*%pi/180);
+Gsmax=1/(1-abs(s11)^2);
+Gsmax=10*log10(Gsmax);
+Glmax=1/(1-abs(s22)^2);
+Glmax=10*log10(Glmax);
+Go=abs(s21)^2;
+Go=10*log10(Go);
+Gtumax=Gsmax+Glmax+Go;
+disp(Gsmax,'the maximum matching section gain in dB = ')
+disp(Glmax,'the maximum matching section gain in dB = ')
+disp(Go,'the gain of the mismatched transistor in dB = ')
+disp(Gtumax,'the maximum unilateral transducer gain in dB = ')
+\ No newline at end of file