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  1. A bipolar differential amplifier uses a transistor having β0 = 200, ICQ = 100 mA, |Adm| = 500 and CMRR = 80 dB. The value of Rc and RE will be respectively __________ .

    2. A.
    1.25 kΩ, 1.25 MΩ
    B.
    125 kΩ, 1.25 MΩ
    C.
    1.25 MΩ, 1.25 kΩ
    D.
    3.25 kΩ, 3.25 MΩ

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    Answer : Option A

    Explanation :

    80 = 20 log CMRR

    ∴ CMRR = 10000

    But CMRR = 2gmRE

    ∴ = 1.25 MΩ

    Adm = - gmRC

    = 1.25 KΩ.

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