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+clc
+//Chapter 3:Network noise and intermodulation distortion
+//example 3.8 page no 84
+//given
+NF=4//noise figure in dB
+B=3*10^3//bandwidth
+Rs=50//sourse resistance
+k=1.38*10^-23//Boltzmmans constant
+T=290//tempreture
+NFa=20//antenna noise figure
+NFr=10//receiver noise figure
+Fa=10^(NFa/10)//antenna noise factor
+Fr=10^(NFr/10)//receiver noise factor
+S_N=10//output signal to noise ratio
+Si_W=(S_N)*(Fa+Fr-1)*k*T*B//available input power in Watts
+Ei=sqrt(Si_W*4*Rs)//minimum detectable signal
+mprintf('the minimum detectable signal is %f uV',round(Ei*1e6*10)/10)