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15 September, 12:04

The common-emitter current gains of two transistors are β = 60 and β = 150. Determine the corresponding common-base current gains. (b) The commonbase current gains of two transistors are α = 0.9820 and α = 0.9925. Determine the corresponding common-emitter current gains.

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  1. 15 September, 12:13
    0
    a1) for β = 60, α = 0.9836

    a2) for β = 150, α = 0.9934

    b1) for α = 0.9820, β = 54.56

    b2) for α = 0.9925, β = 132.33

    Explanation:

    a1) for β = 60

    α = β / (β+1)

    α = 60 / (60+1)

    α = 60/61

    α = 0.9836

    a2) for β = 150

    α = 150 / (150+1)

    α = 150 / (150+1)

    α = 150/151

    α = 0.9934

    b1) for α = 0.9820

    β = α / (1-α)

    β = 0.9820 / (1-0.9820)

    β = 54.56

    b2) for α = 0.9925

    β = 0.9925 / (1-0.9925)

    β = 132.33
  2. 15 September, 12:26
    0
    Given Information:

    Common-emitter current gains = β = 60 and 150

    Common-base current gains = α = 0.9820 and 0.9925

    Required Information:

    Common-base current gains = α = ?

    Common-emitter current gains = β = ?

    Answer:

    Common-base current gain = α = 0.9836 and 0.9933

    Common-emitter current gains = β = 54.55 and 132.33

    Explanation:

    The current gain beta is the ratio of change in collector current and the change in base current and is called beta (β)

    The current gain alpha is the ratio of change in collector current and the change in emitter current and is called alpha (α)

    The relationship between alpha and beta is

    α = β/β + 1 and β = α/1 - α

    (a) Common Base Current Gain (α)

    For β = 60:

    α = 60/60+1 = 60/61 = 0.9836

    For β = 150:

    α = 150/150+1 = 150/151 = 0.9933

    (a) Common Emitter Current Gain (β)

    For α = 0.9820:

    β = 0.9820/1-0.9820 = 0.9820/0.018 = 54.55

    For α = 0.9925:

    β = 0.9925/1-0.9925 = 0.9925/0.0075 = 132.33
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