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  1. A germanium diode has a reverse saturation current of 30 μA at 125°C and forward current of 1 mA at a forward potential of 0.8 V and the reverse potential is 0.6 V What are its dynamic forward and reverse resistance at this temperature.

    2. A.
    10.7 Ω, 70 kΩ
    B.
    34 Ω, 20 kΩ
    C.
    80 Ω, 20 kΩ
    D.
    800 Ω, 40 kΩ

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    Answer : Option B

    Explanation :

    We have,

    I = I0•(eV/nVT -1)

    ∴

    For forward voltage greater than few teeth's of volts, I >> I0

    ∴

    ∴ Forward dynamic resistance,

    = 34.3 Ω

    Reverse dynamic resistance = = 20 kΩ.

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