Andre van Bezooijen & Reza Mahmoudi 
Adaptive RF Front-Ends for Hand-held Applications [PDF ebook] 

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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.

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表中的内容

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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语言 英语 ● 格式 PDF ● 网页 153 ● ISBN 9789048199358 ● 文件大小 3.9 MB ● 年龄 02-99 年份 ● 出版者 Springer Netherland ● 市 Dordrecht ● 国家 NL ● 发布时间 2010 ● 下载 24 个月 ● 货币 EUR ● ID 2221549 ● 复制保护 社会DRM

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