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+//Example5.14:"Output noise voltage""
+//Page 167
+//figure 5.29
+clear;
+clc;
+Rf=99000;       // in Ohm
+Ri=1000;        //in ohm
+Rs=100;        //in ohm
+Av=1+Rf/Ri;
+disp(Av,"Av ordinary value");
+disp(20*log10(Av),"Av dB value");
+Anoise=Av;          //for non inverting amplifier
+Rnoise=Rs+Rf*Ri/(Rf+Ri);
+disp("Ohm",Rnoise,"Rnoise");
+
+T=300;      //Given in degree cel.
+K=1.38*10^-23;      //Boltzmann's constant
+Vind=4*10^-9;       //In V/Hz
+Iind=0.6*10^-12;     //in A/Sqrtof Hz
+eth=(4*K*T*Rnoise)^0.5;      //sqared the 
+etot=((Vind^2)+(Iind*Rnoise)^2 +eth^2)^0.5;
+disp("V/(Hz)^0.5",etot,"etotal");
+
+funity=10*10^6;     //in Hz
+f2=funity/Anoise;
+disp("Hz",f2,"f2");
+BWnoise=f2*1.57;
+disp("Hz",BWnoise,"BWnoise");
+
+en=etot*(BWnoise)^0.5;
+disp("V",en,"en");
+
+en_out=en*Anoise;
+disp("V",en_out,"en_out");
+
+//for a nominal output signal of 1V RMS signal to noise ratio is 
+signal=1;           //in V
+Noise=en_out;
+S_N=signal/Noise;
+
+disp(S_N,"Signal to Noise ratio ");           //answer in book is approxmately 
+disp(20*log10(S_N),"S/N in dB");
+//Result