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  1. Consider the common emitter amplifier shown below with the following circuit parameters: β = 100, gm = 0.3861 A/V, r0 = ∞ rp = 259 Ω, Rs = 1 kΩ, RB = 93 kΩ, RC = 250 Ω, RL = 1 kW, C1 = ∞ and C2 = 4.7mF.

    The resistance seen by the source Vs is

    2. A.
    258 Ω
    B.
    1258 Ω
    C.
    93 kΩ
    D.
    ∞

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    Workspace

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    Answer : Option B

    Explanation :

    Zs = Rs + (RB || Brs)

    rc = 2.475 = 1.258 kV

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