2Modulation Systems and Characteristics

2.1 Introduction

Radio frequency (RF) power amplifiers are used in countless applications at tens of thousands of facilities around the world. The wide variety of applications, however, stem from a few basic concepts of conveying energy and information by means of an RF signal. Furthermore, the devices used to produce RF energy have many similarities, regardless of the final application. Although communications systems represent the most obvious use of high-power RF generators, numerous other common applications exist, including

  • Induction heating and process control systems

  • Radar (ground, air, and shipboard)

  • Satellite communications

  • Atomic science research

  • Medical research, diagnosis, and treatment ...

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