First slide

Transistor

Question

In the following common emitter configuration, an n-p-n transistor with current gain, $β = 100$ is used. The output voltage of the amplifier will be

Moderate

A

10 mV
B

0.1 V
C

1.0 V
D

10 V

Solution

Given that,
$β = 100$
$R_{i} = 1 kΩ$
$R_{L} = 10 KΩ$
$V_{i} = {ΔV}_{BE} = 1 mv$
voltage gain
$A_{V} = \frac{{ΔV}_{CE}}{{ΔV}_{BE}} = β \times \frac{R_{L}}{R_{i}}$
${ΔV}_{CE} = {ΔV}_{BE} \times β \times \frac{R_{L}}{R_{I}}$
${ΔV}_{CE} = 1 \times 10^{- 3} \times 100 \times \frac{10}{1} = 1.0 V$

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