Adaptive RF Front-Ends for Hand-held Applications [electronic resource] / by Andre van Bezooijen, Reza Mahmoudi, Arthur van Roermund.Material type: TextLanguage: English Series: Analog Circuits and Signal Processing: Publisher: Dordrecht : Springer Netherlands, 2011Description: XV, 200p. 100 illus. online resourceContent type: text Media type: computer Carrier type: online resourceISBN: 9789048199358Subject(s): Engineering | Data transmission systems | Microwaves | Systems engineering | Engineering | Circuits and Systems | Solid State Physics | Input/Output and Data Communications | Microwaves, RF and Optical EngineeringAdditional physical formats: Printed edition:: No titleDDC classification: 621.3815 LOC classification: TK7888.4Online resources: Click here to access online
Symbols -- Abbreviations -- 1 Introduction -- 2 Adaptive RF frond-ends -- 3 Adaptive impedance control -- 4 Adaptive power control -- 5 Conclusions -- Appendix A Overview of adaptively controlled matching networks -- Appendix B A dual-banding technique -- Appendix C Transistor breakdown voltages -- References -- Summary.
The RF front-end – antenna combination is a vital part of a mobile phone because its performance is very relevant to the link quality between hand-set and cellular network base-stations. The RF front-end performance suffers from changes in operating environment, like hand-effects, that are often unpredictable. Adaptive RF Front-Ends for Hand-Held Applications presents an analysis on the impact of fluctuating environmental parameters. In order to overcome undesired behavior two different adaptive control methods are treated that make RF frond-ends more resilient: adaptive impedance control, and adaptive power control. Several adaptive impedance control techniques are discussed, using a priori knowledge on matching network properties, in order to simplify robust 2-dimensional control. A generic protection concept is presented, based on adaptive power control, which improves the ruggedness of a power amplifier or preserves its linearity under extremes. It comprises over-voltage, over-temperature, and under-voltage protection.