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Prepared by Mr.P.V.Satish , Lecturer in ECE Under the guidance of P.Srinivas , Head of ECE

e – Lessons Faculty Module for C-16 Curriculum. State Board of Technical Education & Training Andhra Pradesh. Year/Semester : III Semester Branch : Electronics and Communication Engg Subject : EC-302, Electronic Circuits Topic : LARGE SIGNAL AMPLIFIERS AND OSCILLATORS

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Prepared by Mr.P.V.Satish , Lecturer in ECE Under the guidance of P.Srinivas , Head of ECE

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  1. e – Lessons Faculty Module for C-16 Curriculum State Board of Technical Education & Training Andhra Pradesh • Year/Semester : III Semester • Branch : Electronics and Communication Engg • Subject : EC-302,Electronic Circuits • Topic : LARGE SIGNAL AMPLIFIERS AND OSCILLATORS • Sub Topic : CLASSIFICATION OF POWER AMPLIFIERS • Duration : 50 min Prepared by Mr.P.V.Satish, Lecturer in ECE Under the guidance of P.Srinivas, Head of ECE Andhra Polytechnic, Kakinada C_16_ECE_302_3.3

  2. Chapter3 : Large signal Amplifiers and Oscillators Objective 3.3 : classification of power amplifiers based on period of conduction Time Duration: 50 minutes 1 Period C_16_ECE_302_3.3

  3. Approximate time : 2 minutes Main objectives of this Lesson • Primary classification in power amplifiers. • To understand the concept of Period of Conduction. • Classification of Power amplifiers. C_16_ECE_302_3.3

  4. Approximate time : 2 minutes Primary classifications in Power amplifiers Power amplifiers can be classified based on Frequency of operation. Type of circuit. Mode of Operation (period of conduction). C_16_ECE_302_3.3

  5. Approximate time : 2 minutes FREQUENCY OF OPERATION Depending on the frequency range of operation power amplifiers are classified into two types. Audio-power amplifiers Radio-power amplifiers C_16_ECE_302_3.3

  6. Approximate time : 2 minutes TYPE OF CIRCUIT Depending on the type of circuit used the power amplifiers are classified as follows. Push Pull amplifier. Complementary symmetry amplifier. C_16_ECE_302_3.3

  7. Approximate time : 10 minutes PERIOD OF CONDUCTION CONDUCTION ANGLE : • The time during which the transistor conducts when an input sinusoidal signal is applied to a power amplifier is defined as Conduction angle. • Higher conduction angle results in better linearity but lower efficiency. Click here C_16_ECE_302_3.3

  8. Approximate time : 2 minutes CLASSIFICATION OF POWER AMPLIFIERS Power amplifiers are classified into four types based on period of conduction. They are: Class A Power amplifier. Class B Power amplifier. Class C Power amplifier. Class AB Power amplifier. C_16_ECE_302_3.3

  9. Approximate time : 5 minutes Class A Power amplifier In class-A amplifiers the collector is biased at a value greater than the amplitude of AC signal current. Hence the conduction angle is 360 Degrees i.e. the Class A stage conducts for the entire cycle for the input signal. or C_16_ECE_302_3.3

  10. Approximate time : 5 minutes Class B Power amplifier Class B amplifiers are biased at zero DC bias collector current. Hence it conducts only for half of the input signal cycle, so the conduction angle for class B amplifier is 180 Degrees. or Period of No conduction C_16_ECE_302_3.3

  11. Approximate time : 5 minutes Class AB Power amplifier In class AB amplifiers the biasing current is non zero but much smaller than the peak current of the sine wave signal. The conduction angle is slightly greater than 180 Degrees. or Period of No conduction C_16_ECE_302_3.3

  12. Approximate time : 5 minutes Class C Power amplifier In class C amplifier the transistor conducts for an interval less than the half cycle. Hence the conduction angle is less than 180 Degrees. or Period of No conduction C_16_ECE_302_3.3

  13. Approximate time : 2 minutes Conclusion Power amplifiers are classified depending on period of conduction into Class A, Class B, Class AB and Class C. C_16_ECE_302_3.3

  14. MCQ 1) ………………. coupling is generally employed in power amplifiers • Transformer • RC • direct • Impedance • Answer : A C_16_ECE_302_1.1

  15. MCQ 2) A class A power amplifier uses ………… • Two transistors • Three transistors • One transistor • None of the above • Answer : C C_16_ECE_302_1.1

  16. Assignment • Explain the concept of period of conduction. • What is the primary classification of amplifiers. • Classify power amplifier with period of conduction. C_16_ECE_302_1.1

  17. End of Lesson 3.3 in Chapter 3 of EC302 C_16_ECE_302_3.3

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