Linear and Switch-Mode RF Power Amplifiers
eBook - ePub

Linear and Switch-Mode RF Power Amplifiers

Design and Implementation Methods

  1. 359 pages
  2. English
  3. ePUB (mobile friendly)
  4. Available on iOS & Android
eBook - ePub

Linear and Switch-Mode RF Power Amplifiers

Design and Implementation Methods

About this book

RF power amplifiers are implemented in communication, semiconductor wafer processing, magnetic resonance imaging (MRI), and radar systems to produce RF signal with the desired characteristics to perform several critical tasks in the entire system. They can be designed to operate in linear or switch-mode, depending on the specific application. This book explores the design and implementation methods for both linear and switch-mode amplifiers with real world engineering problems. The text discusses phased controlled switch-mode amplifiers and distortion and modulation effects in RF amplifiers. It illustrates the interface and integration of components and sub-systems for RF amplifiers. The material is further reinforced with MATLAB design files.

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Yes, you can access Linear and Switch-Mode RF Power Amplifiers by Abdullah Eroglu in PDF and/or ePUB format, as well as other popular books in Technology & Engineering & Electrical Engineering & Telecommunications. We have over one million books available in our catalogue for you to explore.
1
Radio Frequency Amplifier Basics

1.1INTRODUCTION

Radio frequency (RF) power amplifiers are one of the critical elements for communication systems when signal in use needs to be amplified for several applications. The simplified RF power amplifier block diagram is shown in Figure 1.1.
Radio frequency power amplifiers consist of several surrounding components. The main component of the amplifier is the active device that is critical in the amplification process. The surrounding components in the amplifier are matching networks that are implemented at the input and output of the amplifier, biasing network, stability networks, filters that are used to eliminate spurious or harmonic contents, and control system of the amplifier to ensure the functionality of the amplifier against various conditions.
The type and class of the amplifier are important parameters in the design process, apart from the design of its surrounding components. The amplifier type can be small signal or large signal based on the design, whereas class of the amplifier might belong to a group of linear or switch-mode class of amplifiers. The type and class of the amplifier are based on the application and requirements identified beforehand for the designer. In this book, different components, types, and classes of the amplifiers; mathematical and computer tools that are used to design, simulate, and implement RF; and microwave amplifier and components will be discussed.

1.2TYPES OF AMPLIFIERS: SMALL SIGNAL AND LARGE SIGNAL AMPLIFIERS

Amplifiers have inherently nonlinear characteristics owing to active devices that are used during amplification process. However, when signal levels are small enough, it does not cause distortion to vary parameters of the active devices, which results in the linear relationship between input and output of the amplifier.
When the conditions satisfy the requirements of the linear approximation, amplifiers can be analyzed using two-port parameters and network methods. The type of the amplifiers in this group are called as small signal amplifiers. The efficiency of small signal amplifiers is not critical. The design for this type of amplifiers use complex conjugate matching method.
For high-power applications, large signal levels are applied for amplification, and this causes distortion in the amplifier due to variation of the active device parameters. Hence, small signal analysis and techniques cannot be applied anymore for these types of amplifiers. The type of the amplifiers in this group are called as large signal amplifiers. The conventional conjugate matching method also does not deliver the maximum power to the load connected at the output of the amplifier. Hence, the technique called load line matching [1] needs to be implemented to overcome the limitations ...

Table of contents

  1. Cover
  2. Half Title
  3. Title Page
  4. Copyright Page
  5. Dedication
  6. Contents
  7. Preface
  8. Acknowledgments
  9. Author
  10. Chapter 1 Radio Frequency Amplifier Basics
  11. Chapter 2 Two-Port Parameters
  12. Chapter 3 Impedance Matching and Resonant Networks
  13. Chapter 4 Small-Signal Amplifiers
  14. Chapter 5 Linear Amplifier Design and Implementation
  15. Chapter 6 Switch-Mode Amplifier Design and Implementation
  16. Chapter 7 Phase-Controlled Switch-Mode Amplifiers
  17. Chapter 8 Distortion and Modulation Effects in RF Power Amplifiers
  18. Index