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 :
- 15 and 200
- 150 and 15000
- 20 and 2000
- 200 and 1000
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:
- Semiconductor acts like an insulator at Zero Kelvin. On increasing the temperature, it works as a conductor.
- Due to their exceptional electrical properties, semiconductors can be modified by doping to make semiconductor devices suitable for energy conversion, switches, and amplifiers.
- Lesser power losses.
Uses of Semiconductor:
- Semiconductors are widely used in manufacturing electronics devices like transistors, diodes, sensors, integrated circuits.
- Semiconductors are widely used in all electronic devices, like mobile phones, digital cameras, communication devices, trains, ATMs, etc.