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+clc;
+// page no 135
+// prob no 4_11_1
+//An amplifier is given
+Rn=300;//Equivalent noise resistance
+Ieq=5*10^-6;//Equivalent noise current is 5 uA
+Rs=150;//Amplifier fed from 150 ohm,10 uV rms sinusoidal source
+Vs=10*10^-6;
+Bn=10*10^6;//Noise BW is 10 MHz
+//Assume the following
+kT=4*10^-21;//k is Boltzman constant in J/K & T is room temp
+q=1.6*10^-19;//Charge on electron in coulombs
+//Determination of shot noise current
+Ina=(2*q*Ieq*Bn)^(1/2);
+disp('nA',Ina*(10^9)','The value of shot noise current Ina is ');
+//Noise voltage developed by this across source resistance is 
+V=Ina*Rs;
+disp('uV',Vs*(10^6)','The value of noise voltage across Rs is ');
+//Noise voltage developed across Rn resistance is
+Vna=(4*Rn*kT*Bn)^(1/2);
+disp('uV',Vna*(10^6)','The value of noise voltage across Rn is ');
+//Determination of thermal noise voltage from source 
+Vns=(4*Rs*kT*Bn)^(1/2);
+disp('uV',Vns*(10^6)','The value of thermal noise voltage at Rs is');
+//Determination of total noise voltage at input
+Vn=(((V)^2)+((Vna)^2)+((Vns)^2))^(1/2)
+disp('uV',Vn*(10^6)','The value of total noise voltage Vn is ');
+//Determination of signal to noise ratio in dB
+SNR=20*(log10(Vs/Vn));
+disp('dB',SNR,'The value of signal to noise ratio is ');
+\ No newline at end of file