Highâ"Efficiency RF Power Amplifiers and Oscillators

About the Author ix
Preface xi
Acknowledgment xv

1 Active Devices and Modeling 1
1.1 MOSFET Device Modeling 1
1.2 LDMOSFETs 4
1.3 Equivalent Circuits Characterizing Device Input and Output Impedances 23
1.4 GaAs MESFETs and GaN HEMTs 25
1.5 BJTs and HBTs 32

2 Impedance Matching 51
2.1 Conjugate-matching Condition 51
2.2 Matching with Lumped Elements 55
2.3 Matching with Transmission Lines 73
2.4 Lossy Match Design Technique 93
2.5 Broadband Matching with Prescribed Amplitude-frequency Response 97

3 High-efficiency Power Amplifier Design 107
3.1 Class-F Circuit Design 107
3.2 Inverse Class F 131
3.3 Class E with Shunt Capacitance 155
3.4 Parallel-circuit Class E 174
3.5 Class E with Shunt Capacitance and Shunt Filter 197Contents vii
3.6 Summary: Magic of Parallel Circuits 208
3.7 Summary: Comparison of Output Impedances and Load-network Parameters 211
3.8 Design Example: Two-stage High-efficiency 1.75-GHz MMIC HBT Power Amplifier Using Parallel-circuit Class-E Mode 213
3.9 Broadband Class-E Power Amplifiers 226

4 High-efficiency Oscillator Design 249
4.1 Oscillator Basic Structures 250
4.2 Empirical Optimum Design Approach 256
4.3 Analytic Optimum Design Approach 260
4.4 High-efficiency Design Technique 268
4.5 Class-E Power Oscillators for WPT Systems 290
4.6 Design Example: Parallel-circuit Class-E Oscillator for Compact Fluorescent Lamps 295

5 High-efficiency Doherty Amplifiers 305
5.1 Conventional Doherty Architecture 306
5.2 Asymmetric Doherty Amplifiers 315
5.3 Multistage Doherty Amplifiers 322
5.4 Inverted Doherty Amplifiers 331
5.5 Three-way Doherty Amplifier with Enhanced Backoff Region 335
5.6 Integrated and Monolithic Doherty Amplifiers 338
5.7 Multiband and Broadband Capability 355
5.8 Design Example: High-power 3.4â"3.8 GHz Asymmetric Inverted GaN HEMT Doherty Amplifier for Base Station Applications 371
5.9 Design Examples: Integrated Sub-6-GHz Two-stage GaN HEMT Doherty Amplifiers for Massive-MIMO Applications 379

6 Mixed-mode and Alternative Efficiency Enhancement Techniques 395
6.1 Class-FE Power Amplifiers 395
6.2 Class-E/F3 Power Amplifiers 407
6.3 Class-E/F3 Oscillators 426
6.4 Switched-path and Load-modulated Balanced Power Amplifiers 428
6.5 Three-way Doherty Amplifier with Three-coupled-line Combiner 437
6.6 Envelope Tracking for Cellphone Applications 442

References 446
Index 451