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//ANALOG AND DIGITAL COMMUNICATION
//BY Dr.SANJAY SHARMA
//CHAPTER 6
//NOISE
clear all;
clc;
printf("EXAMPLE 6.18(PAGENO 310)");
//given
G_1 = 4//gain in first stage in dB
G_2 = 10//gain in second stage in dB
F_1 = 10//noise figure for first stage in dB
F_2 = 10//noise figure for second stage in dB
//calculations
F_1ratio = exp((F_1/10)*log(10));//noise figure of first stage in ratio
F_2ratio = exp((F_2/10)*log(10));//noise figure of second stage in ratio
G_1ratio = exp((G_1/10)*log(10));//gain of first stage in ratio
G_2ratio = exp((G_2/10)*log(10));//gain of second stage in ratio
F = F_1ratio + ((F_2ratio - 1)/(G_1ratio));//Overall noise figure
G = log10(G_1ratio *G_2ratio );
F_dB= 10*log10(F)////Overall noise figure in dB
//results
printf("\n\ni.Overall noise figure = %.2f dB", F_dB );
printf("\n\nii.Overall gain = %.2f dB",G );
printf("\n\nNote:There is mistake in calculation of overall gain in textbook")
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