Engineering
Module
5
Amplifiers
Power Amplifiers
Introduction to Power Amplifiers
What you’ll learn in Module 5.
Section 5.0 Introduction to Power Amplifiers.
Understand the Operation of Power Amplifiers.
Section 5.1 Power Transistors & Heat Sinks.
• Power Transistor Construction.
• Power De-rating & High Power Operation.
• Thermal Resistance of Heat Sinks.
• Thermal Runaway.
Section 5.2 Class A Power Amplifiers.
•The limitations due to the efficiency of class A power amplifiers.
•Transformer coupled Class A power output stages.
Section 5.3 Class B Amplifiers.
• Class B biasing.
Power Amplifiers
• Crossover distortion.
• Class B biasing.
Amplifier circuits form the basis of most electronic systems, many of which need to produce high power to drive some output device. Audio amplifier output power may be anything from less than 1 Watt to several hundred Watts. Radio frequency amplifiers used in transmitters can be required to produce thousands of kilowatts of output power, and DC amplifiers used in electronic control systems may also need high power outputs to drive motors or actuators of many different types. This module describes some commonly encountered classes of power output circuits and techniques used to improve performance. • Push-pull output.
• Advantages & disadvantages of class B.
Section 5.4 Push-pull Driver Stages.
• Driver transformers.
• Transistor phase splitter stages.
• Emitter coupled phase splitter.
• Transformerless push-pull.
Section 5.5 Class AB Amplifiers.
• Complementary Outputs.
• Temperature & DC stabilisation.
• Mid-point & crossover adjustment.
• NFB & Bootstrapping.
Section 5.6 Amplifier Classes C to H.
• Class C operation.
• Class D Power Amplifier operation.
• Class E & F Power Amplifiers.
• Class G & H Power Amplifiers.
5.7 Power Amplifiers Quiz.
• Test your knowledge and understanding of Power Amplifiers.
AC THEORY MODULE 05.PDF
1
© E. COATES 2007 -2012
5
Amplifiers
Power Amplifiers
Introduction to Power Amplifiers
What you’ll learn in Module 5.
Section 5.0 Introduction to Power Amplifiers.
Understand the Operation of Power Amplifiers.
Section 5.1 Power Transistors & Heat Sinks.
• Power Transistor Construction.
• Power De-rating & High Power Operation.
• Thermal Resistance of Heat Sinks.
• Thermal Runaway.
Section 5.2 Class A Power Amplifiers.
•The limitations due to the efficiency of class A power amplifiers.
•Transformer coupled Class A power output stages.
Section 5.3 Class B Amplifiers.
• Class B biasing.
Power Amplifiers
• Crossover distortion.
• Class B biasing.
Amplifier circuits form the basis of most electronic systems, many of which need to produce high power to drive some output device. Audio amplifier output power may be anything from less than 1 Watt to several hundred Watts. Radio frequency amplifiers used in transmitters can be required to produce thousands of kilowatts of output power, and DC amplifiers used in electronic control systems may also need high power outputs to drive motors or actuators of many different types. This module describes some commonly encountered classes of power output circuits and techniques used to improve performance. • Push-pull output.
• Advantages & disadvantages of class B.
Section 5.4 Push-pull Driver Stages.
• Driver transformers.
• Transistor phase splitter stages.
• Emitter coupled phase splitter.
• Transformerless push-pull.
Section 5.5 Class AB Amplifiers.
• Complementary Outputs.
• Temperature & DC stabilisation.
• Mid-point & crossover adjustment.
• NFB & Bootstrapping.
Section 5.6 Amplifier Classes C to H.
• Class C operation.
• Class D Power Amplifier operation.
• Class E & F Power Amplifiers.
• Class G & H Power Amplifiers.
5.7 Power Amplifiers Quiz.
• Test your knowledge and understanding of Power Amplifiers.
AC THEORY MODULE 05.PDF
1
© E. COATES 2007 -2012