00000cmm a22000004a 4500 UP-99796217611255675 Buklod 20140512094148.0 m go j cr cn||||aaaaa 101029s2011 xx u | eng d 9789048199358 (eBook) (iLib)UPD-00216804618 DLC DML eng DMLUC TK 5103.2 B49 2011eb Bezooijen, Andre van Adaptive RF front-ends for hand-held applications [electronic resource] by Andre van Bezooijen, Reza Mahmoudi, Arthur van Roermund. Dordrecht Springer Netherlands 2011. 1 online resource (xv, 153 p.) ill. Analog circuits and signal processing 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. IP-based subscription, access limited to within on campus computer network. Access via Electronic Resources of the UPD University Library Website. 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. Electronic reproduction. New York SpringerLink 2011. Available via World Wide Web through SpringerLink. Wireless communication systems. Adaptive signal processing. Mahmoudi, Reza. Roermund, Arthur H. M. van. SpringerLink (Online service). Available for University of the Philippines Diliman via SpringerLink. Click here to access http://link.springer.com/book/10.1007/978-90-481-9935-8 FO Monograph UPD DMLR Electronic Resource