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// Example 6.4
// Calculation of the amplifier gain
// Page no 262
clc;
clear;
close;
//Given data
Po=0; // Signal output of amplifier
//f=7*10^9; // Cut off frequency
B=7.5*10^9; // Bandwidth
R=0.9; // Responsivity
c=3*10^8; // Velocity of light
lambda=1550*10^-9; // Operating frequency
fn=4.5; // Noise figure
Ro=0.066*10^-3; // Beat noise current
h=6.626*10^-34; // Planck constant
// The amplifier gain
P=10^(Po/10)*10^-3;
r=Ro^2/(4*R^2*B*P);
fn=10^(fn/10);
f=c/lambda;
G=(1/fn)*(((2*r)/(h*f))+1);
//Displaying results in the command window
printf("\n The amplifier gain = %0.0f ",G);
// The answers vary due to round off error
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