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+// Example 8.34
+// Calculation of signal to noise ratio.
+// Page no 491
+
+clc;
+clear;
+close;
+
+//Given data
+
+h=6.62*10^-34;                       // Planck constant
+c=5*10^-12;                          // capacitor
+lambda=1.55*10^-6;                  // Wavelength
+B=50*10^6;                         // Speed of communication
+s=2*10^-9;
+I=10^-7;
+k=1.381*10^-23;
+T=291;
+x=0.3;
+e=1.602*10^-19;
+
+// Maximum load resistance is
+R=1/(2*%pi*c*B);
+
+S=I^2/((2*e*B*I)+(4*k*T*B/R));
+M=((4*k*T)/(e*x*R*I))^(0.435);
+S1=((((M^2)*(I^2))/(2*e*B*I*M^2.3))+((4*k*T*B)/R));
+S1=10*log10(S1);
+//Displaying results in the command window            
+printf("\n Load resistor(in ohm) = %0.1f  ",R);
+printf("\n S/N(in dB) = %0.2f  ",S);
+printf("\n M  = %0.2f  ",M);
+printf("\n S/N(in dB)  = %0.2f  ",S1);
+
+// The answers vary due to round off error