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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
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