Power Amplifier and Its Classes Presentation Slide

1. GREEN UNIVERSITY OF BANGLADESH
Presentation
On
Power Amplifier And It’s Classes
Presented by:
Md. Nahid Hasan
#ID: 161001008
Dept.: EEE
Presented for:
………………………...
Professor & Chairperson

2. What is power amplifier?
An amplifier is an electronic device that can
increase the power of a signal (A time-varying
voltage or current).
An amplifier uses electric power from a power
supply to increase the amplitude of a signal.

3. Amplifier classes
 Class A Amplifier
 Class B Amplifier
 Class AB Amplifier
 Class C Amplifier
 Class D Amplifier

4. The amplifier conducts through the full
360 of the input signal.
The Q-point is set at the middle of the load
line so that the AC signal can swing a full
cycle.
Remember that the DC load line
indicates the maximum and minimum
limits set by the DC power supply.
Class a amplifier

5. The amplifier conducts through
180 of the AC input signal.
The Q-point is at 0V on the load line, so that
the AC signal can only swing for one-half
cycle.
Class b amplifier

6. This is a compromise between the class A
and class B amplifiers. The amplifier
conducts somewhere between 180 and
360 of theAC input signal.
The Q-point is located between the mid-
point and cutoff level.
Class ab amplifier

7. The amplifier conducts less than
180 of the input.
The Q-point is located below the
cutoff level.
Class c amplifier

8. This is an amplifier that is
biased especially for digital
signals.
Class d amplifier

9. Amplifier efficiency