Buch, Englisch, 153 Seiten, Previously published in hardcover, Format (B × H): 155 mm x 235 mm, Gewicht: 271 g
Buch, Englisch, 153 Seiten, Previously published in hardcover, Format (B × H): 155 mm x 235 mm, Gewicht: 271 g
Reihe: Analog Circuits and Signal Processing
ISBN: 978-94-007-9914-1
Verlag: Springer Netherlands
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.
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.
Zielgruppe
Research
Autoren/Hrsg.
Fachgebiete
Weitere Infos & Material
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.
