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  4. A common emitter amplifier circuit, built using an npn transistor, is shown in the figure. Its dc current gain is 250, RC = 1kΩ and VCC = 10 V. What is the minimum base current for VCE to reach saturation ?

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Q. A common emitter amplifier circuit, built using an npn transistor, is shown in the figure. Its dc current gain is $250, \,R_C = 1k\Omega$ and $V_{CC} = 10 V$.
What is the minimum base current for $V_{CE}$ to reach saturation ?Physics Question Image

JEE MainJEE Main 2019Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

At saturation state, $V_{CE}$ becomes zero
$\Rightarrow i_{C} = \frac{10V}{1000\Omega} = 10 mA$
now current gain factor $ \beta = \frac{i_{C}}{i_{B}} $
$ \Rightarrow i_{B} = \frac{10mA}{250} = 40 \mu A $

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