Overview

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.

Full Product Details

Author:   Andre van Bezooijen ,  Reza Mahmoudi ,  Arthur H.M. van Roermund
Publisher:   Springer
Imprint:   Springer
Volume:   0
Dimensions:   Width: 15.50cm , Height: 1.10cm , Length: 23.50cm
Weight:   0.930kg
ISBN:  

9789048199341

ISBN 10:   9048199344
Pages:   153
Publication Date:   05 November 2010
Audience:   College/higher education ,  Professional and scholarly ,  Postgraduate, Research & Scholarly ,  Professional & Vocational
Format:   Hardback
Publisher's Status:   Active
Availability:   In Print  
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Table of Contents

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.

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