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  1. An amplifier has open loop gain of 100, input impedance 1 kΩ and output impedance 100 Ω. If negative feedback with β = 0.99 is used, the new input and output impedances are

    2. A.
    10 Ω and 1 Ω
    B.
    10 Ω and 10 kΩ
    C.
    100 kΩ and 1 Ω
    D.
    100 kΩ and 10 Ω

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    Answer : Option C

    Explanation :

    Input impedance with feedback = (1 kΩ) (1 + 100 + 0.99) = 100 kΩ. Output impedance with feedback = .

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