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Adaptive RF Front-Ends for Hand-held Applications

by van Bezooijen, Andre.
Authors: Mahmoudi, Reza.%author. | van Roermund, Arthur.%author. | SpringerLink (Online service) Series: Analog Circuits and Signal Processing Physical details: XV, 200p. 100 illus. online resource. ISBN: 9048199352 Subject(s): Engineering. | Data transmission systems. | Microwaves. | Systems engineering. | Engineering. | Circuits and Systems. | Solid State Physics. | Input/Output and Data Communications. | Microwaves, RF and Optical Engineering.
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E-Book E-Book AUM Main Library 621.3815 (Browse Shelf) Not for loan

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.

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