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A mixer stage has a noise figure of 20 dB. This mixer stage is preceded by an amplifier which has a noise figure of 9 dB and an available power gain of 15 dB. The overall noise figure referred to the input is(a) 11.07(b) 18.23(c) 56.43(d) 97.38I have been asked this question in final exam.Origin of the question is Noise topic in section EDC Overview of Electronic Devices & Circuits

Answer» RIGHT CHOICE is (a) 11.07

Best EXPLANATION: The REQUIRED ANSWER is 7.94 + (100-1)/31.62 = 11.07.


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