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+//Example 7.9 // NEP and specific detectivity
+clc;
+clear;
+close;
+//given data :
+h=6.63*10^-34;
+c=3*10^8;
+Id=9*10^-9;// in A
+e=1.6*10^-19;
+eta=60/100;
+lamda=1.3*10^-6;// in m
+A=100*50*10^-12;// in m^2
+NEP=(h*c*sqrt(2*Id*e))/(eta*e*lamda);
+disp(NEP,"NEP,(W) = ")
+D=sqrt(A)/NEP;
+disp(D,"Specific detectivity,(MHz^(-1/2) W^-1) = ")