Design of Linear RF Outphasing Power Amplifiers

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.

The book opens with anintroduction to wireless communication standards and the requirements theyimpose on power amplifiers, together with a historical review of the outphasingpower amplifier. Plus, this unique resource investigates various factors thatcontribute to outphasing system linearity degradation, reviews and comparesvarious approaches for path mismatch reduction and linearity performanceimprovement. What's more, the book raises the issue of efficiency-isolationtrade-off on power combining, discusses combining methods and choices of poweramplifiers, and analyzes efficiency enhancement techniques.Contents:Introduction - the Role ofPower Amplifiers in Wireless Communication Systems. Characterization of PowerAmplifier for Wireless Communications. Power Amplifier Linearization andEfficiency Enhancement Techniques. Outphasing Microwave Power Amplifiers.References.Linearity Performance ofOutphasing Power Amplifier Systems - Introduction. Digital ModulationTechniques. Baseband Filtering ofDigital Data. Signal Component Separation for Outphasing Amplifiers. PathImbalance and Its Effects on Linearity. Effect of Quadrature Modulator Errorson Linearity. SCS Quantization Error Effects on Outphasing Systems. LinearityEffects of Reconstruction Filter and DSP Sampling Rate. Summary.References.Path Mismatch ReductionTechniques for Outphasing Amplifiers - Introduction. Correction Schemes Basedon Training Vectors. Correction Schemes Transparent to Data Transmission.Correction Schemes for Multicarrier and Broadband Applications. VCO-DerivedSynthesis. Summary. Appendix. References. Power Efficiency EnhancementTechniques - Introduction. Power Combiners. Choice of Amplifier. Design forClass A, B and C Amplifiers. Chireix Power Combining. Design for Switching-ModeAmplifiers. Application of Lossy Power Combiners. Probability Distribution ofOutput Power. Power Recycling in Outphasing Amplifiers. Summary. Appendix.References.Conclusions - ResearchSummary. Future Research Directions.Xuejun Zhang is seniorengineer at Qualcomm Inc. He holds a Ph.D. in electrical engineering from theUniversity of California, San Diego, an M.S. in electro-optics from theNational University of Singapore, and a B.S. in semiconductor physics fromPeking University, China. He has published extensively.Lawrence E. Larson isdirector of the Center for Wireless Communications at the University ofCalifornia, San Diego and past CWC Industry Chair Professor in WirelessCommunications, Department of Electrical and Computer Engineering. A Fellow ofthe IEEE, he has conducted numerous research and development projects at HughesResearch Laboratories and Hughes Network Systems. He holds an M.B.A. and aPh.D. in electrical engineering from the University of California, Los Angeles,an M. Eng. and B.S. in electrical engineering from Cornell University, NewYork.Peter M. Asbeck is aprofessor of Department of Electrical and Computer Engineering at theUniversity of California, San Diego and has done extensive work at PhilipsLaboratories and the Rockwell International Science Center as principalscientist, technical staff member, researcher and teacher. He holds a Ph.D.,M.S. and B.S. in electrical engineering from the Massachusetts Institute ofTechnology and is a Fellow of the IEEE.