The document discusses power amplifiers, including their types, operating principles, applications, advantages, and disadvantages. It describes the main types of power amplifiers as Class A, B, AB, and C amplifiers, which differ in their conduction angles. The operating principles involve amplifying low-power signals to higher power levels suitable for driving loads. Main applications include public address systems, sound reinforcement, home audio systems, musical instrument amplifiers, radio/TV transmitters, and wireless communication systems. Power amplifiers provide advantages like high power gain, efficiency, and frequency response but also have disadvantages such as high cost, power consumption, distortion, heat generation, and complexity.

1. Power Amplifiers
Md. Raihan Hossain Jibon
191015092
CSE (EVE) Green University of Bangladesh

2. Table of content
1. Introduction
2. Types of power amplifier
3. Operating principles of power amplifier
4. Applications of power amplifier
5. Advantages and disadvantages of power amplifier
6. Conclusion

3. Introduction
• A power amplifier is an electronic amplifier that is designed to
increase the power of an input signal. It is a type of amplifier that
is used to amplify low-power signals to levels that are suitable for
driving loads such as speakers or antennas.
• Importance of pulse generation in electronic systems
1. Timing and synchronization
2. Modulation
3. Signal processing
4. Testing and measurement

4. Types of power amplifier
Class A amplifier is a high gain amplifier with high linearity. In
case of Class A amplifier, the conduction angle is 360 degree.
As we stated above, a 360-degree conduction angle means
the amplifier device remains active for the entire time and
use complete input signal.
The Class B amplifier is a bit different from the Class A. It is
created using two active devices which conduct half of
the actual cycle, ie 180 degrees of the cycle. Two devices
provide combined current drive for the load.

5. Types of power amplifier
An alternate approach to overcome the cross-over
distortion, is to use the AB amplifier. Class AB amplifier uses
intermediate conduction angle of both Classes A and B, thus we
can see the property of both Class A and Class B amplifier in
this AB class of amplifier topology.
Class C amplifier is tuned amplifier which works in two different
operating modes, tuned or un tuned. The efficiency of Class C
amplifier is much more than the A, B, and AB. Maximum
80% efficiency can be achieved in radio frequency related
operations

6. Operating principles of power amplifier
The operating principles of a power amplifier
are based on the amplification process, which
involves increasing the power of an input
signal. Power amplifiers are typically designed
to amplify low-power signals to levels that are
suitable for driving loads such as speakers

7. Applications of power amplifier
• Main application is public address system
• Theatrical and correct sound reinforcement
• In domestic sound system such as stereo or home theatre system
• In instrument amplifier including guitar amplifier
• Radio and television transmitters
• Wireless communication systems

8. Advantages and Disadvantages of power amplifier
• Advantages
1. high power gain
2. High efficiency
3. Wide frequency response
4. High linearity
5. Compact size
• Disadvantages
1. High cost
2. High power consumption
3. Distortion
4. Heat generation
5. Complexity

9. Conclusion
• In conclusion, power amplifiers are electronic devices that are
used to increase the power of an input signal. They are commonly
used in a wide range of applications.

10. Thank you