Power Amplifier | Electrical Engineering SSC JE (Technical) - Electrical Engineering (EE) PDF Download
POWER AMPLIFIER
POWER AMPLIFIER-Large Signal Amplifier Power amplifier are meant for large signal amplification power stage is normally the final stage of a cascade amplifier and driver. The energy conversion device i.e. speaker, antenna or transducer etc. The power amplifier does not actually amplifier the power, instead it takes power from the dc power supply connected to the power circuit and converts into use full ac signal power Zin ® high. Zout ® low, heat sink are used.
Class A
Here the dc bias is adjusted much less than its cut off value so that the output current flow for full input voltage cycle.
Feature:
1. Minimum distortion.
2. Since the output contains only one frequency component, the output power is small.
3. Efficiency is low.
4. Used as voltage amplifier as modulating amplifier.
Class B
Here the dc bias is adjusted equal to the cut off value so that the output current flow for half of the input voltage cycle. Hence the output dc component will be always equal to zero.
Feature:
1. High distortion
2. High power output
3. Efficiency is large
4. Used as power amplifier as modulated amplifier.
Class AB
Here the dc bias is adjusted slightly less than is cut-off value so that the output current flows for more than half but less than input voltage cycle. This class of amplifier is just a compromise between class A and class B amplifier.
Feature:
1. Output power is medium
2. Medium distortion
3. Medium efficiency
4. Used as modulating amplifier
5. Used with untuned power amplifier.
Class C
Here the dc bias is adjusted greater than its cutoff value so that the output current flow for less than half of the input voltage cycle.
Therefore the output current will be in the from of pulses which will be highly rich in harmonic i.e. frequency multiplier.
Feature:
1. Very high output power due to rich in harmonic
2. Very high distortion
3. Very high conversion efficiency
4. Used as only modulated amplifier when the need is to raise the power level before transmission
5. Used with tuned frequency amplifier.
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FAQs on Power Amplifier - Electrical Engineering SSC JE (Technical) - Electrical Engineering (EE)
| 1. What is a power amplifier in electrical engineering? |  |
Ans. A power amplifier is an electronic device used to increase the power of a low-power audio signal or radio frequency signal to a level suitable for driving loudspeakers or antennas.
| 2. How does a power amplifier work? | |
Ans. A power amplifier works by taking a low-power input signal and increasing its amplitude or power level. This is achieved through the use of active devices such as transistors or vacuum tubes, which provide the necessary gain and power handling capabilities.
| 3. What are the different classes of power amplifiers? | |
Ans. There are several classes of power amplifiers, including Class A, Class AB, Class B, Class C, and Class D. Each class has its own characteristics and efficiency levels, making them suitable for different applications.
| 4. What is the efficiency of a power amplifier? | |
Ans. The efficiency of a power amplifier is a measure of how effectively it converts input power into output power. It is typically expressed as a percentage and represents the ratio of output power to input power. Higher efficiency amplifiers are desirable as they waste less power and generate less heat.
| 5. What are some common applications of power amplifiers? | |
Ans. Power amplifiers are widely used in various applications, including audio systems, wireless communication systems, radar systems, and high-power RF transmitters. They are essential for driving loudspeakers, antennas, and other devices that require high power levels.
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