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Q.

For a common emitter amplifier, the audio frequency voltage across the collector resistance 2 $kΩ$ is 2 V. If the current amplification factor of the transistor is 200, and the base resistance is 1.5 $kΩ$ , the input signal voltage and base current are

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a

0.15 V and 10 $μ$ A

b

0.015 V and 1 $μ$ A

c

0.0015 V and 1 mA

d

0.0075 V and 5 $μ$ A

answer is D.

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Detailed Solution

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collector current $I_{c} = \frac{V_{c}}{R_{c}} = \frac{2}{2 \times 10^{3}} = 10^{- 3} A$

$\begin{array}{rcl} current gain β & = & \frac{I_{c}}{I_{B}} \\ I_{B} & = & \frac{I_{c}}{β} = \frac{10^{- 3}}{200} = 0.5 \times 10^{- 5} = 5 μA \\ input votage is I_{B} R_{B} & = & 5 \times 10^{- 6} \times 1.5 \times 10^{3} = 7.5 \times 10^{- 3} V \end{array}$

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