Chapter 1

Power Amplifier Design Principles

Introduction

This introductory chapter presents the basic principles for understanding the power amplifiers design procedure in principle. Based on the spectral-domain analysis, the concept of a conduction angle is introduced, by which the basic Classes A, AB, B, and C of the power-amplifier operation are analyzed and illustrated in a simple and clear form. The frequency-domain analysis is less ambiguous because a relatively complex circuit often can be reduced to one or more sets of immittances at each harmonic component. Classes of operation based upon a finite number of harmonics are discussed and described. The different nonlinear models for various types of MOSFET, MESFET, HEMT, and BJT devices ...

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