Question:

In a common emitter transistor amplifier the audio signal voltage across the collector is $3\,V$. The resistance of collector is $3\, k\Omega$. If current gain is $100$ and the base resistance is $2\, k\Omega$, the voltage and power gain of the amplifier is :

Updated On: May 3, 2024
  • 15 and 200
  • 150 and 15000
  • 20 and 2000
  • 200 and 1000
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The Correct Option is B

Solution and Explanation

The correct option is(B): 150 and 15000.

Current gain \((\beta)=100\)
 

Voltage gain \((A _{ V }) =\beta \frac{R_{c}}{R_{b}}\)
 

\(=100\left(\frac{3}{2}\right)\)
 

\(=150\)
 

Power gain \(= A_{v} \beta\)
 

\(= 150(100)\)
 

\(= 15000\)

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Concepts Used:

Semiconductors

Semiconductors are a crystalline solid materials, whose electrical conductivity lies between a conductor and an insulator. Semiconductors are mainly used in the manufacturing of electronic devices like capacitors, transistors, diodes, Integrated circuits, etc.

Properties of Semiconductor:

  1. Semiconductor acts like an insulator at Zero Kelvin. On increasing the temperature, it works as a conductor.
  2. Due to their exceptional electrical properties, semiconductors can be modified by doping to make semiconductor devices suitable for energy conversion, switches, and amplifiers.
  3. Lesser power losses.

Uses of Semiconductor:

  1. Semiconductors are widely used in manufacturing electronics devices like transistors, diodes, sensors, integrated circuits.
  2. Semiconductors are widely used in all electronic devices, like mobile phones, digital cameras, communication devices, trains, ATMs, etc.