This is the first book devoted exclusively to the outphasing power amplifier, covering the most recent research results on important aspects in practical design and applications. A compilation of all the proposed outphasing approaches, this is an important resource for engineers designing base station and mobile handset amplifiers, engineering managers and program managers supervising power amplifier designs, and R&D personnel in industry. The work enables you to: design microwave power amplifiers with higher efficiency and improved linearity at a lower cost; understand linearity and performance tradeoffs in microwave power amplifiers; and understand the effect of new modulation techniques on microwave power amplifiers.
Author(s): Xuejun Zhang, Lawrence E. Larson, Peter Asbeck
Publisher: Artech House
Year: 2003
Language: English
Pages: 218
Tags: Приборостроение;Электроника;
TeamLiB......Page 0
Cover......Page 1
Contents......Page 8
Preface......Page 12
1.1 The Role of Power Amplifiers in Wireless Communication Systems......Page 15
1.2 Characterization of Power Amplifiers for Wireless Communications......Page 19
1.2.1 Power Amplifier Waveform Quality Measurements......Page 20
1.2.2 Power Efficiency Measurements......Page 33
1.3 Power Amplifier Linearization and Efficiency-Enhancement Techniques......Page 36
1.4.1 Historical Perspectives on Outphasing Power Amplifiers......Page 41
1.4.2 Introduction to the Theory of Outphasing Amplification......Page 43
2.1 Introduction......Page 49
2.2.1 QPSK and Its Variations......Page 50
2.3 Baseband Filtering of Digital Data......Page 55
2.3.1 Raised Cosine Filter......Page 59
2.3.2 Gaussian Filter......Page 63
2.3.3 IS- 95 Baseband Filter......Page 64
2.4 Signal Component Separation for Outphasing Amplifiers......Page 65
2.5 Path Imbalance and Its Effects on Linearity......Page 75
2.5.1 Two- Tone Linearity Analysis of an Outphased Amplifier with Path Mismatch Effects......Page 76
2.5.2 ACI Estimation with Gain and Phase Mismatch......Page 78
2.6 Effect of Quadrature Modulator Errors on Linearity......Page 81
2.6.1 Quadrature Modulator Error Minimization......Page 83
2.6.2 Quadrature Modulator Error Effects on Outphasing Systems......Page 86
2.7.1 Error Effects of Quantization of the Source Signal......Page 89
2.7.2 Error Effects of Quantization of the Quadrature Signal......Page 90
2.8 Linearity Effects of Reconstruction Filter and DSP Sampling Rate......Page 93
2.9 Summary......Page 95
3.1 Introduction......Page 101
3.2 Correction Schemes Based on Training Vectors......Page 102
3.2.1 Baseband Preconditioning of Path Mismatch Errors......Page 103
3.2.2 Foreground Calibration Algorithm of Path Mismatch Errors......Page 105
3.3.2 Simplex Search Algorithm Correction......Page 116
3.3.1 Phase- Only Correction Approach......Page 115
3.3.3 Direct Search Algorithm......Page 118
3.3.4 Background Calibration Algorithm......Page 119
3.4 Mismatch Correction Scheme for Broadband Applications......Page 126
3.5 VCO- Derived Synthesis......Page 128
3.5.1 CALLUM......Page 133
3.5.2 VLL......Page 138
4.1 Introduction......Page 143
4.2 Power- Combining Techniques for Outphasing Amplifiers......Page 144
4.3 Amplifier Choices for Outphasing Systems......Page 149
4.4 Outphasing Amplifier Design Using Class A, B, and C Amplifiers......Page 151
4.5 Chireix Power- Combining Technique......Page 156
4.6 Combiner Design for Switching- Mode ( Class D and Class E) Amplifiers......Page 159
4.6.1 Analysis of MOSFET- Based Class D Outphasing Amplifier with Lossless Combining......Page 161
4.6.2 Simulation and Discussion of MOS- Based Class D with Lossless Combining......Page 167
4.7 Application of Lossy Power Combiners to Outphasing Power Amplifiers......Page 170
4.8 Probability Distribution of Output Power and Its Impact on Efficiency......Page 173
4.9 Power Recycling in Outphasing Amplifiers......Page 177
Signal......Page 178
4.9.2 Analysis and Discussion for Linear- Modulated Signals......Page 190
4.9.3 Practical Implementations......Page 198
4A. 1 Available Power from the Hybrid Combiner......Page 200
4A. 2 Recycling Efficiency and VSWR for Arbitrary Diode Model......Page 202
About the Authors......Page 205
Index......Page 207
