Advanced Techniques in RF Power Amplifier Design

This much-anticipated volume builds on the author’s popular work, RF Power Amplifiers for Wireless Communications (Artech House, 1999), offering you a more in-depth understanding of the theory and design of RF power amplifiers. An invaluable reference tool for RF, digital and system level designers, the book enables you to efficiently design linear RF power amplifiers , and includes detailed discussions on envelope power management schemes and linearization techniques.

Written by a recognizedauthority on PA design, this in-depthvolume treats a range of power amplifier topics using readable symbolicanalysis and idealized models, and follows up with CAD simulation using readilyavailable commercial CAD tools. The work covers such vital topics as the use of bipolar devices in conventionalhigh efficiency PA design, the Doherty and Chireix PAs, envelope feedback,memory effects, predistortion, feedforward, and microwave PA techniques.Contents:RF Power AmplifierModes-Conventional Reduced Angle Modes, Class A, AB, B, C. Linearity andEfficiency Variation with Power Backoff. FETs and Bipolars: Differences inReduced Conduction Angle Operation. Interaction between Device TransferCharacteristics and Class AB Non-linearity. Tailoring of Device Characteristicsfor Optimum Class AB Linearity and Efficiency; the RF bipolar as a potentialsolution. RF PA design using Bipolar Transistors.Doherty and Chireix: Themesand Variations-Basic Doherty PA Analysis. Implementation Schemes for BasicDoherty PA. The Assymetric Doherty PA for High Crest Factor Signals. TheMultiway Doherty Combiner. Linearity Issues. CAD Simulation Results. Chireix OutphasingPA-a LINC Technique. Chireix-Envelope Reconstruction Possibility. Analysis, CADSimulation and Issues for Practical Implementation. Variations. >Topics in PA Nonlinearity-TheImpact of High Density Bandlimited Communications Signals on PA Design andSpecification. Peak to Average Ratio: PEP Design Issues. Behavioral Modellingof PaAs,AM-AM and AM-PM Distortion. Volterra Series Model, IM Nulling Effectsin Higher Order Models. Extraction of Volterra Series Model from Measured Data.Dynamic Effects in PA Nonlinearities: Extension to Conventional Envelope SimulationFormulations. Assymetrical IM Sidebands: Causes, Models and Cures.Envelope Feedback-The AMEnvelope Feedback Method. Analysis and Simulation. Limitations of RF and VideoDelays. Vector Envelope Feedback. Low Latency PA Design.Predistortion-Introduction toPredistortion. Predistortion Theory: Synthesis of Ideal Predistorter usingInversion of PA Polynomial. Analog Predistorters; Gain Expanders; IM and ACPAnalysis for Multicarrier Signals. CAD Analysis of Predistorters Having SynthesizedCharacteristics. Predistorter Realization: Compound Analog Predistorter Design;DSP Implementation of Synthesized PD Response; DSP Lookup Table; CompoundAnalog PD with External DSP Adaptation. Advantages and Disadvantages of theseDifferent Approaches. Feedforward-Introduction tothe Feedforward Configuration. Analysis of the Feedforward Loop usingBehavioral PA Model. Error PA Power Capability. Gain and Phase Tracking:Differences in Goals Between First and Second Loops. Benefits and Hazards ofExternal Video Adaptation. Use of Predistortion in Feedforward Loop. Microwave Power AmplifierDesign-The Move from RF to Microwave Frequencies. Materials, Hybrids, MMICs.Chip-and-Wire Design Issues. The Lange Coupler: Balanced Amplifier Design.Thermal Issues in Microwave Power Hybrids. Matching Big Chips: Where Has theGain Gone. Microwave Power Combiners.