A common emitter amplifier circuit, built using an NPN transistor, is shown in the figure. Its dc current gain is $250$ , $R_{C} = 1 kΩ$ and $V_{C C} = 10 V$ . The minimum base current for $V_{C E}$ to reach saturation is

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Given, β = 250 R C = 1000 Ω V C C = 10 V At saturation, V C E = 0 ⇒ i e = 10 V 1000 Ω = 10 m A Current gain factor, β = i e i B ⇒ i B = i e β = 10 m A 250 = 40 μ A

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