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+//chapter 8 example 1//
+clc
+clear
+//photo current of the dode=Ip,quantam efficiency=n,wavelength=l,plancks constant=h,speed of light=c,power at given wave length=Po,total shot noise=i2,thermal noise in the load resistor=i2th,dark current=Id,post detection bandwidth of the receiver=B//
+n=0.50;//quantam efficiency//
+e=1.6*(10^-19);//charge of the electron//
+l=0.85*(10^-6);//in mts//
+h=6.63*(10^-34);//plancks constant//
+c=3*(10^8);
+Po=250*(10^-9);
+Ip=((n*e*Po*l)/(h*c))*(10^9);
+printf("\n a) photo current in the dode=%f nA\n",Ip)
+Id=4;//in nano amperes//
+B=8*(10^6);
+i2=sqrt((2*e*B*(Ip+Id))*(10^11));
+printf("\n b) total shot noise=%f*(10^-10) A\n",i2)
+Kb=1.38*(10^-23);
+T=300;
+Rl=6000;
+ith=sqrt(((4*Kb*T*B)/Rl)*(10^18));
+printf("\n c) thermal noise generated=%f*(10^-9) A\n",ith)
+\ No newline at end of file