RF Circuit Design

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RF Circuit Design

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RF Circuit Design

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RF Circuit Design is written for those who desire a practical approach to the design of rf amplifiers, impedance matching networks, and filters. It is totally user oriented. If you are an individual who has little rf circuit design experience, you can use this book as a catalog of circuits, using component values designed for your application. On the other hand, if you are interested in the theory behind the rf circuitry being designed, you can use the more detailed information that is provided for in-depth study. An expert in the rf circuit design field will find this book to be an excellent reference manual, containing most of the commonly used circuit-design formulas that are needed. However, an electrical engineering student will find this book to be a valuable bridge between classroom studies and the real world. And, finally, if you are an experimenter or ham, who is interested in designing your own equipment, RF Circuit Design will provide numerous examples to guide you every step of the way. Chapter 1 begins with some basics about components and how they behave at rf frequencies; how capacitors become inductors, inductors become capacitors, and wires become inductors, capacitors, and resistors. Toroids are introduced and toroidal inductor design is covered in detail.

Chapter 2 presents a review of resonant circuits and their properties including a discussion of Q, pass band ripple, bandwidth, and coupling. You learn how to design single and multi resonator circuits, at the loaded Q you desire. An understanding of resonant circuits naturally leads to filters and their design. Chapter 3 presents complete design procedures for multiple-pole Rutterworth, Chebyshel.. and Bessel filters including low-pass, high-pass, bandpass, and bandstop designs. Within minutes after reading Chapter 3, you will be able to design multiple.- pole filters to meet your specifications. Filter design was never easier. , Chapter 4 covers impedance matching of both real and complex impendances. This is done both numerically and with the aid of the Smith Chart. Mathematics are kept to a bare minimum. Both high-Q and low-Q matching networks are covered in depth. Transistor behavior at rf frequencies is discussed in Chapter 5. Input impedance. output impedance, feedback capacitance, and their variation over frequency are outlined. Transistor data sheets are explained in detail, and Y and S parameters are introduced.

Chapter 6 details complete cookbook design procedures for rf small-signal amplifiers, using both Y and S parameters. Transistor biasing, stability, impedance matching, and neutralization techniques are covered in detail, complete with practical examples. Constant-gain circles and stability circles, as plotted on a Smith Chart, are introduced while rf amplifier design procedures for minimum noise figure are also explained.

The subject of Chapter 7 is rf power amplifiers. This chapter describes the differences between small- and large-signal amplifiers, and provides step-by-step procedures for designing the latter. Design sections that discuss coaxial-feedline impedance matching and broadband transformers are included.
Appendix A is a math tutorial on complex number manipulation with emphasis on their relationship to complex impedances. This appendix is recommended reading for those who are not familiar with complex number arithmetic. Then, Appendix B presents a systems approach to low-noise design by examining the Noise Figure parameter and its relationship to circuit design and total systems design. Finally, in Appendix C, a bibliography of technical papers and books related to rf circuit design is given so that you, the reader, can further increase your understanding of rf design procedures.

CHAPTER 1 COMPONENTS . . . . . . . . . . . . . . . . . . .
1.1 Wire - Resistors - Capacitors - Inductors - Toroids - Toroidal Inductor Design - Practical Winding Hints
CHAPTER 2 RESONANT CIRCUITS . . . . . . . . . . . . . . . . . 31
Some Definitions - Resonance (Lossless Components) - Loaded Q - Insertion Loss - Impedance Transformation - Coupling of Resonant Circuits
CHAPTER 3 FILTER DESIGN . . . . . . . . . . . . . . . . . . .
44 Background - Modem Filter Design - Normalization and the Low-Pass Prototype - Filter Types - Frequency and Impedance Scaling - High-Pass Filter Design - The Dual Network - Bandpass Filter Design - Summary of the Bandpass Filter Design Procedure - Band-Rejection Filter Design - The Effects of Finite Q
CHAPTER 4 IMPEDANCE MATCHING . . . . . . . . . . . . . . . .
66 Background - The L Network - Dealing With Complex Loads - Three-Element Matching - Low-Q or Wideband Matching Networks - The Smith Chart - Impedance Matching on the Smith Chart - Summary
CHAPTER 5 THE TRANSISTOR AT RADIO FREQUENCIE~ . . . . . . . . . . .
99 The Transistor Equivalent Circuit - Y Parameters - S Parameters - Understanding Rf Transistor Data Sheets - Summary
CHAPTER 6 SMALL-SIGNAL RF AMPLIFIER DESIGN . . . . . . . . . . . .
1x7 Transistor Biasing - Design Using Y Parameters - Design Using S Parameters
CHAPTER 7 RF POWER AMPLIFIERS . . . . . . . . . . . . . . . . 150
Rf Power Transistor Characteristics - Transistor Biasing - Power Amplifier Design - Matching to Coaxial Feedlines - Automatic Shutdown Circuitry - Broadband Transformers - Practical Winding Hints - Summary APPENDIX A VECTOR ALGEBRA . . . . . . . . . . . . . . .
APPENDIX B NOISE CALCULATIONS . . . . . . . . . . . . . Types of Noise - Noise Figure - Receiver Systems Calculations
APPENDIX C BIBLIOGRAPHY . . . . . . . . . . . . . . . . . Technical Papers - Books
INDEX . . . . . . . . . . . . . . . . . . . , . 164 . . 167 . . 170 . . 172