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  1. An amplifier operating over a frequency range of 18 to 20 MHz has 10 kΩ input resistance. At a temperature of 27° C, the noise voltage at input of amplifier is (Boltzman constant k = 1.38 x 10-23 J/K)

    2. A.
    18.2 μV
    B.
    182 μV
    C.
    16.2 μV
    D.
    162 μV

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    Answer : Option A

    Explanation :

    Using Equation Va = (4 x 1.38 x 10-23 x 300 x 2 x 106 x 104)0.5 = 18.2 x 10-6 V.

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