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// Example 7.9.1 page 7.45
clc;
clear;
lamda=1.4d-6;
h=6.626d-34; //plank's constant
c=3d8; //speed of light
q=1.6d-19; //charge of electron
eta=65/100; //quantum efficiency
I=10d-9; //current
NEP= h*c*sqrt(2*q*I)/(eta*q*lamda);
D=NEP^-1;
printf("\nNoise equivalent power is %.3e W.\nSpecific directivity is %.2e.",NEP,D);
//answers in the book for NEP is 7.683*10^-14, deviation of 0.04*10^-14.
//answers in the book for D is 13.01 *10^12, deviation of 0.11*10^12.
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