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  1. If each stage has a gain of 10 dB and noise figure of 10 dB, then the overall noise figure of a two stage cascade amplifier will be

    2. A.
    10
    B.
    1.09
    C.
    1.0
    D.
    10.9

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    Answer : Option D

    Explanation :

    Overall noise figure F of the system is

    F = F1 +

    F1 = F2 = 10 dB = 10 in absolute units

    g = 10 dB = 10 in absolute units

    ∴ F = 10 + = 10.9 .

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