Adaptive RF Front-Ends for Hand-held Applications

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.

List 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.

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.

Product details

• Authors: Andre van Bezooijen, Rez Mahmoudi, Reza Mahmoudi, Arthur H. M. Roermund, Arthur H. M. Van Roermund, Arthur H.M. van Roermund, Andr van Bezooijen, Andre van Bezooijen, van Roermund, Arthur H. M. van Roermund, Arthur H.M. van Roermund
• Publisher: Springer Netherlands
• Languages: English
• Product format: Paperback / Softback
• Released: 01.01.2014
• EAN: 9789400799141
• ISBN: 978-94-0-079914-1
• No. of pages: 153
• Dimensions: 158 mm x 8 mm x 236 mm
• Weight: 272 g
• Illustrations: XV, 153 p.
• Series: Analog Circuits and Signal Processing; Analog Circuits and Signal Processing
• Subjects: Natural sciences, medicine, IT, technology > Technology > Electronics, electrical engineering, communications engineering; B, engineering, Microwaves, RF and Optical Engineering, Microwaves, RF Engineering and Optical Communications, Solid State Physics, Circuits and Systems, Electronic Devices, Spectrum analysis, spectrochemistry, mass spectrometry, Electronic circuits, Electronic Circuits and Systems, Optical engineering, Microwaves, Microwave technology, Computer networking & communications, Distributed databases, Input/Output and Data Communications, Input-output equipment (Computers)