Adaptive RF Front-Ends for Hand-held Applications

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Springer Science & Business Media, Oct 28, 2010 - Technology & Engineering - 153 pages
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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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Contents

Chapter 1 Introduction
1
Chapter 2 Adaptive RF FrontEnds
9
Chapter 3 Adaptive Impedance Control
35
Chapter 4 Adaptive Power Control
107
Chapter 5 Conclusions
129
Appendix A
131
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