Introduction to large signal Amplifier, Efficiency of Directly coupled and Transformer coupled class A Amplifier

1. ELECTRONIC CIRCUIT(21EC302)
•POWER AMPLIFIERS
• Session-1(UNIT-5)
K.Sangeethalakshmi
• AP/ECE

2. SYLLABUS
• Classification of large signal amplifiers – Class A, B, AB, C, D –
Conversion efficiency – Class C tuned amplifier.

3. TOPICS TO BE DISCUSSED……
• Classification of large signal amplifiers
• Class A

4. CLASSIFICATION OF POWER AMPLIFIERS
Based on the amount of transistor bias, the position of the quiescent
point (Q point) on the load line decides the class of operation of the
power amplifier.
The power amplifiers can be classified as
• CLASS A
• CLASS B
• CLASS AB
• CLASS C.

5. CLASS A AMPLIFIER
The class A amplifiers are classified as
➢ directly coupled
➢ transformer coupled amplifiers.

6. SERIES FED CLASS A AMPLIFIER

7. SERIES FED CLASS A AMPLIFIER

8. SERIES FED CLASS A AMPLIFIER

9. TRANSFORMER COUPLED CLASS A AMPLIFIER

10. TRANSFORMER COUPLED CLASS A AMPLIFIER

11. TRANSFORMER COUPLED CLASS A AMPLIFIER