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+// Example 6.32
+// Calculation of signal to noise ratio
+// Page no 495
+
+clc;
+clear;
+close;
+
+//Given data
+I=152.3*10^-9;                     // Peak photocurrent
+s=74.15*10^-20;                    // Shot noise 
+t=4.94*10^-17;                    // Mean square shot noise current
+F=10*log10(3);                    // Noise figure
+B=15*10^6;                        // Bandwidth
+T=298;                            // Room temperature
+k=1.381*10^-23;                   // Boltzman constant
+R=5*10^3;                         // Load resistance
+e=1.602*10^-19;                  // Charge of an electron
+
+
+// Signal to noise ratio
+S=(I^2)/((2*e*B*(2+I))+(4*k*T*B*F)/R);
+S=S*10^3;
+
+
+
+
+//Displaying results in the command window            
+printf("\n Signal to noise ratio = %0.2f  ",S);
+
+
+// The answers vary due to round off error