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+// Example 6.31
+// Calculation of a)peak photocurrent , b)shot noise and c)mean square shot noise current
+// Page no 489
+
+clc;
+clear;
+close;
+
+//Given data
+n=0.7;                               // Efficiency
+lambda=0.9*10^-6;                    // Wavelength
+R=5*10^3;                           // Load resistance
+I=2*10^-9;                          // Dark current
+P=300*10^-6;                        // Incident power
+B=15*10^6;                          // Bandwidth
+T=298;                             // Room temperature
+h=6.62*10^-34;
+c=3*10^8;
+e=1.602*10^-19;                    // Charge of an electron
+k=1.381*10^-23;                    // Boltzman constant
+
+// a)Peak photocurrent
+I=(n*P*e*lambda)/(h*c);
+I=I*10^6;
+
+//b) Shot noise and mean square shot noise current
+s=2*e*B*(2+I);
+s=s*10^11;
+
+//c) mean square shot noise current
+t=(4*k*T*B)/R;
+t=t*10^17;
+
+
+
+
+//Displaying results in the command window            
+printf("\n Peak photocurrent (in nA)= %0.3f  ",I);
+printf("\n Shot noise(in 10^-20 A)0 = %0.1f  ",s);
+printf("\n Mean square shot noise current(in 10^-17 A) = %0.2f  ",t);
+
+
+
+// The answers vary due to round off error