For a BJT, the common-base current gain α = 0.98 and the collector-base junction reverse bias saturation current $I_{CO} = 0.6 μ A$ . This BJT is connected in the common-emitter mode and operated in the active region with a base drive current $I_B$ = 20 μ A. The collector current $I_C$ for this mode of operation is

(a) 0.98 mA (b) 0.99 mA (c) 1.0 mA (d) 1.01 mA

Question

For a BJT, the common-base current gain α = 0.98 and the collector-base junction reverse bias saturation current $I_{CO} = 0.6 μ A$ . This BJT is connected in the common-emitter mode and operated in the active region with a base drive current $I_B$ = 20 μ A. The collector current $I_C$ for this mode of operation is

(a) 0.98 mA (b) 0.99 mA (c) 1.0 mA (d) 1.01 mA

Accepted Answer

We have

[latex]\begin{gathered}I_{C}=\beta I_{B}+(1+\beta) I_{CO}\\beta=\frac{\alpha}{1-\alpha}=\frac{0.98}{1-0.98}=49 \I_{C}=49 imes 20 imes 10^{-6}+50 imes 0.6 imes 10^{-6}=1.01 mA\end{gathered}[/latex]

Ans. (d)

Question 10.SG.Q.25: For a BJT, the common-base current gain a = 0.98 and the col......

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