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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

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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) 97.38

I have been asked this question in final exam.

Origin of the question is Noise topic in section EDC Overview of Electronic Devices & Circuits

1 Answer

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Right choice is (a) 11.07

Best explanation: The required answer is 7.94 + (100-1)/31.62 = 11.07.

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