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ADVANCED DESIGN
TECHNIQUES FOR RF POWER
AMPLIFIERS
by
Donetsk National University, Ukraine
and
Vladimir Krizhanovski
Donetsk National University, Ukraine
Anna Rudiakova
Contents
Contributing Authors vii
Preface ix
Chapter 1
Introduction to the RF Power Amplifiers Design 1
Chapter 2
Theoretical Analysis of BJT Class-F Power Amplifier 31
Chapter 3
BJT Class-F power Amplifier Design 63
Chapter 4
PBG Structure as Amplifier Output Network 69
Chapter 5
BJT Fifth-Harmonic Peaking Class F Power Amplifier 81
Appendix 87
References 131
Index 135
Preface
Power amplifier is the main power consumption block in any advanced
wireless communications system. When the DC power is limited, it is crucial
to design power amplifiers with high power-added efficiency. The output
power and efficiency depends on the active device, bias conditions
according to the operating class, matching networks, and so on. One of the
methods to improve the output power and efficiency is to terminate the
harmonics at the output. Among the harmonics, the first five are especially
in want of tuning, because their magnitudes are relatively larger than the
others’.
In the last seven years the authors have made a lot of efforts in the field
of development of high-efficiency polyharmonic power amplifiers, and the
original results are highly enhanced both by the modelling and the related
design methodologies. Thus, the main idea of this book will be to provide
the reader with a deep analysis of modeling and design strategies of BJT
high-efficiency polyharmonic power amplifiers, as well as to organize in a
coherent manner all the authors’ results in the field of polyharmonic power
amplifiers. Hence, the book allows the reader not only to understand the
operating principle and the features of bipolar transistor power amplifiers,
but also to design high-efficiency amplifiers at the frequencies close to
transition.
The book can be used as a guide by researchers and practicing engineers
dealing with this subject and as a text book to graduate and postgraduate
students who want to extend their knowledge and study all aspects of the
analysis and design of high-efficiency polyharmonic power amplifiers.
Although the material is presented in a formal and theoretical manner, much
emphasis is made on a design perspective. To further link the book’s
ix
x Preface
theoretical aspects with practical issues, simulation and experimental
examples are included.
The book is organized into five chapters. Chapter 1 is introductory and
it contains analytical review of current state of high-efficiency power amplifiers design problem. The strength and weakness of existing
approaches are highlighted, unsolved issues pointed out.
Chapter 2 of the book is devoted to theoretical analysis of BJT class-F
power amplifier near transition frequency and is divided into three sections.
In section 1, we propose the simplified transistor model accounting the
charge storage issues that will be needed in the sequel. Section 2 describes
the analytical derivation of collector current harmonic content depending
on the operating frequency and the biasing conditions, while section 3
presents the Class F realization conditions according to the analysis.
Chapter 3 deals with verification and demonstration of the results
achieved in Chapter 2. Section 1 covers the simulation of BJT class-F power
amplifier near the transition frequency using the accurate transistor model.
Furthermore, section 2 contains experimental results of the fabricated
prototype.
Chapter 4 is devoted to the use of photonic band-gap structures (PBG) as
the output networks of high-efficiency polyharmonic power amplifiers. The
novel type of PBG is proposed providing improved characteristics in the
both stop and pass bands.
Finally, Chapter 5 presents the BJT fifth-harmonic peaking class F power
amplifier design using proposed in Chapter 4 structure.
In addition, we provide our own comprehensive nonlinear power
amplifiers’ simulation tutorial in Appendix.
Anna Rudiakova,
Vladimir Krizhanovski |
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发表于 2008-4-14 11:46:41
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