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## Power amplifier design principles

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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 mixed-mode Class-C is introduced and nonlinear effect of collector capacitance is shown and analyzed. The possibility of the maximum power gain for a stable power amplifier is discussed and analytically derived. The design and concept of push-pull and balanced power amplifiers are presented including transmission-line impedance transformers and combiners. In addition, the basics of the load-line concept and impedance matching are discussed and illustrated.

Chapter Contents:

• 1.1 Basic classes of operation: A, AB, B, and C
• 1.2 Load line and output impedance
• 1.3 Classes of operation based upon finite number of harmonics
• 1.4 Mixed-mode Class C and nonlinear effect of collector capacitance
• 1.5 Power gain and stability
• 1.6 Impedance matching
• 1.6.1 Basic principles
• 1.6.2 Matching with lumped elements
• 1.6.3 Matching with transmission lines
• 1.7 Push–pull and balanced power amplifiers
• 1.7.1 Basic push–pull configuration
• 1.7.2 Baluns
• 1.7.3 Balanced power amplifiers
• 1.8 Transmission-line transformers and combiners
• References

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