SATHEE: Semiconductor Electronics Materials Devices and Simple Circuits

Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 67

69. The input resistance of a silicon transistor is $100 Ω$ . Base current is changed by $40 μ A$ which results in a change in collector current by $2 m A$ . This transistor is used as a common emitter amplifier with a load resistance of $4 K Ω$ . The voltage gain of the amplifier is :

(a) 2000

(b) 3000

(d) 1000

[2012M]

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Answer:

Correct Answer: 69. (a)

Solution:

(a) Voltage gain $(A_{V}) = \frac{V_{out}}{V_{in}} = \frac{I_{out}}{I_{in}} \times \frac{R_{out}}{R_{in}}$

$A_{V} = \frac{2 \times 10^{- 3}}{40 \times 10^{- 6}} \times \frac{4 \times 10^{3}}{100} = 2 \times 100 = 2000$

In a common-emitter amplifier, the voltage signal obtained across the collector and the emitter is $180^{\circ}$ out of phase with the input voltage signal applied across the base and the emitter. This is indicated in the equation for $A_{V}$ by its negative sign.

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Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 67

69. The input resistance of a silicon transistor is 100Ω. Base current is changed by 40μA which results in a change in collector current by 2mA. This transistor is used as a common emitter amplifier with a load resistance of 4KΩ. The voltage gain of the amplifier is :

Answer:

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69. The input resistance of a silicon transistor is $100 Ω$ . Base current is changed by $40 μ A$ which results in a change in collector current by $2 m A$ . This transistor is used as a common emitter amplifier with a load resistance of $4 K Ω$ . The voltage gain of the amplifier is :