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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 = 1 k Ω and VCC = 10V. What is the minimum base current (in μ A) 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 $250, R_C = 1 \,k \,\Omega$ and $V_{CC} = 10V$. What is the minimum base current (in $\mu A)$ for $V_{CE}$ to reach saturation ?Physics Question Image

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

Given, $b = 250$
Voltage gain, $\frac{V_{CC}}{V_B} = \beta \frac{R_C}{R_B}$
$\frac{10}{V_B} = \frac{1}{25 \times 10^3} = 40\,\mu A$