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. 1.1 Context and trends in wireless Communications. 1.2 Resilience to unpredictably changing environments. 1.3 Improvements by adaptively controlled RF front-ends. 1.4 Aim and scope of this book. 1.5 Book outline.
2 Adaptive RF frond-ends. 2.1 Introduction. 2.2 RF front-end functionality. 2.3 Fluctuations in operating conditions. 2.4 Impact of variables. 2.5 Adaptive control theory. 2.6 Identification of variables for detection and correction. 2.7 Conclusions on adaptive RF front-ends.
3 Adaptive impedance control. 3.1 Introduction. 3.2 Mismatch detection method. 3.3 Adaptively controlled PI-networks using differentially controlled capacitors. 3.4 Adaptively controlled L-network using cascaded loops. 3.5 Adaptive series-LC matching network using RF-MEMS. 3.6 Load line adaptation. 3.7 Conclusions on adaptive impedance control.
4 Adaptive power control. 4.1 Introduction. 4.2 Safe operating conditions. 4.3 Power adaptation for ruggedness. 4.4 Power adaptation for linearity. 4.5 Conclusions on 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.
