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Lecture # 9 Power Amplifiers (Class a & B)

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Lecture # 9 Power Amplifiers (Class a & B) Banna Benha University - Faculty of Engineering at Shoubra ECE-312 © Ahmad El Electronic Circuits (A) Lecture # 9 Power Amplifiers (Class A & B) Instructor: December 2014 Dr. Ahmad El-Banna Banna Post Mid-Term Schedule - • Power Amplifiers Week 8 © Ahmad El Week 9 • Oscillators Week 10 • Tuned Amplifiers • Mixers & Modulators 312 Lec#9 , Dec 2014 , - ECE Week 11 • Project Delivery & Oral Exam (Group A) 2 • Project Delivery & Oral Exam (Group B) Banna Agenda - Introduction © Ahmad El Series-Fed Class A Amplifier Transformer-Coupled Class A Amplifier 312 Lec#9 , Dec 2014 , Class B Amplifier Operation - ECE Class B Amplifier Circuits 3 INTRODUCTION 4 ECE-312 , Lec#9 , Dec 2014 © Ahmad El-Banna Banna Amplifier Classes - • In small-signal amplifiers, the main factors are usually amplification linearity and magnitude of gain. • Large-signal or power amplifiers, on the other hand, primarily provide sufficient power to an output load to drive a speaker or other power device, typically a few watts to tens © Ahmad El of watts. • The main features of a large-signal amplifier are the circuit’s power efficiency, the maximum amount of power that the circuit is capable of handling, and the impedance matching to the output device. • Amplifier classes represent the amount the output signal varies over one cycle of operation for a full cycle of input signal. Power Amplifier Classes: 1. Class A: The output signal varies for a full 360° of the input signal. 312 Lec#9 , Dec 2014 , • Bias at the half of the supply - ECE 2. Class B: provides an output signal varying over one-half the input 5 signal cycle, or for 180° of signal. • Bias at the zero level Banna Amplifier Efficiency - Power Amplifier Classes … 3. Class AB: An amplifier may be biased at a dc level above the zero-base-current level of class B and above one-half the supply voltage level of class A. © Ahmad El 4. Class C: The output of a class C amplifier is biased for operation at less than 180° of the cycle and will operate only with a tuned (resonant) circuit, which provides a full cycle of operation for the tuned or resonant frequency. 5. Class D: This operating class is a form of amplifier operation using pulse (digital) signals, which are on for a short interval and off for a longer interval. • The power efficiency of an amplifier, defined as the ratio of power output to power input, improves (gets higher) going from class A to class D. 312 Lec#9 , Dec 2014 , - ECE 6 Banna - © Ahmad El 312 Lec#9 , Dec 2014 , - ECE SERIES-FED CLASS A AMPLIFIER 7 Banna SERIES-FED CLASS A AMPLIFIER - • DC Bias Operation © Ahmad El • AC Operation 312 Lec#9 , Dec 2014 , - ECE 8 Banna Power Considerations - • The power drawn from the supply is • Output Power © Ahmad El • Efficiency • Maximum Efficiency 312 Lec#9 , Dec 2014 , - ECE 9 N.B.: Example 10 ECE-312 , Lec#9 , Dec 2014 © Ahmad El-Banna Banna - © Ahmad El 312 Lec#9 , Dec 2014 , - ECE TRANSFORMER-COUPLED CLASS A 11 AMPLIFIER Banna Transformer Action - • A transformer can increase or decrease voltage or current levels according to its © Ahmad El turns ratio a=N1:N2 • The impedance connected to one side of a transformer can be made to appear either larger or smaller (step up or step down) at the other side of the transformer. • Impedance Transformation • Voltage Transformation 312 Lec#9 , Dec 2014 , - ECE • Current Transformation 12 Banna Operation of Amplifier Stage - • Signal Swing and Output AC Power © Ahmad El • Efficiency 312 Lec#9 , Dec 2014 , - • power loss ECE 13 • Maximum Theoretical Efficiency • Check EXAMPLE 12.4 ! CLASS CLASS B AMPLIFIER AMPLIFIER B OPERATION 14 ECE-312 , Lec#9 , Dec 2014 © Ahmad El-Banna Banna Push–Pull Amplifier - • Class B operation is provided when the dc bias leaves the transistor biased just off, the transistor turning on when the ac signal is © Ahmad El applied. • This is essentially no bias, and the transistor conducts current for only one-half of the signal cycle. • Connection of push–pull amplifier to load • The current drawn from a single power supply has the form of a full- wave rectified signal 312 Lec#9 , Dec 2014 , • whereas that drawn from two power - supplies has the form of a half-wave rectified signal from each supply. ECE 15 Banna Efficiency & Power Consideration - • Maximum Power Considerations © Ahmad El • Efficiency 312 Lec#9 , Dec 2014 , - ECE • Power Dissipated by Output Transistors 16 CLASS CLASS B AMPLIFIER CIRCUITS AMPLIFIER B 17 ECE-312 , Lec#9 , Dec 2014 © Ahmad El-Banna Phase - Splitter Circuits Splitter 18 ECE-312 , Lec#9 , Dec 2014 © Ahmad El-Banna Banna Class B Amplifier Circuits - • Transformer-Coupled Push–Pull Circuits © Ahmad El 312 Lec#9 , Dec 2014 , - ECE 19 Transistors are bulky ! Banna Class B Amplifier Circuits.. - • Complementary-Symmetry Circuits • Complementary-symmetry push–pull circuit using Darlington transistors. © Ahmad El Needs two separate voltage supplies! Biasing the transistors in class AB improves this operation 312 Lec#9 , Dec 2014 , - ECE 20 o higher output current o lower output resistance. Banna Class B Amplifier Circuits… - • Quasi-Complementary Push–Pull Amplifier © Ahmad El o In practical power amplifier circuits, it is preferable to use npn transistors for both high-current-output devices. o The push–pull operation is achieved by using complementary transistors (Q 1 and Q2) before the matched npn output transistors ( Q3 and Q4 ). 312 Lec#9 , Dec 2014 , o R2 can be adjusted to minimize - crossover distortion. ECE o It is the most popular form of power 21 amplifier • Quasi-complementary push–pull transformerless power amplifier. Example 22 ECE-312 , Lec#9 , Dec 2014 © Ahmad El-Banna Banna - • For more details, refer to: • Chapter 12 at R. Boylestad, Electronic Devices and Circuit Theory, © Ahmad El 11th edition, Prentice Hall. • The lecture is available online at: • http://bu.edu.eg/staff/ahmad.elbanna-courses/11966 • For inquires, send to: • [email protected] 312 Lec#9 , Dec 2014 , - ECE 23 .
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