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+//ANALOG AND DIGITAL COMMUNICATION
+//BY Dr.SANJAY SHARMA
+//CHAPTER 6
+//NOISE
+clear all;
+clc;
+printf("EXAMPLE 6.16(PAGENO 309)");
+
+//given
+A_1 = 10//gain in first stage in dB
+A_2 = 10//gain in second stage in dB
+A_3 = 10//gain in third stage in dB
+F_1 = 6//noise figure for first stage in dB
+F_2 = 6//noise figure for second stage in dB
+F_3 = 6//noise figure for third 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 
+F_3ratio = exp((F_3/10)*log(10));//noise figure in third stage in ratio 
+A_1ratio = exp((A_1/10)*log(10));//gain of first stage in ratio
+A_2ratio = exp((A_2/10)*log(10));//gain of second stage in ratio
+A_3ratio = exp((A_3/10)*log(10));//gain of third stage in ratio
+F = F_1ratio + ((F_2ratio - 1)/(A_1ratio)) + ((F_3ratio - 1)/(A_2ratio*A_1ratio));//Overall noise figure
+
+//results
+ printf("\n\nOverall noise figure of three stage cascaded amplifier = %.2f ", F );