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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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.
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Descrizione libro Soft Cover. Condizione: new. Codice articolo 9789400799141
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Descrizione libro Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -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. 172 pp. Englisch. Codice articolo 9789400799141
Descrizione libro Condizione: New. Codice articolo 22980521-n
Descrizione libro Condizione: New. Codice articolo 11830047
Descrizione libro Taschenbuch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering - 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. Codice articolo 9789400799141
Descrizione libro Condizione: New. The RF front-end - antenna combination is a vital part of a mobile phone. This book offers a unique account of adaptive RF front-ends. It includes an analysis on the impact of fluctuating environmental parameters, and a generic protection concept is presented. Series: Analog Circuits and Signal Processing. Num Pages: 153 pages, 10 black & white tables, biography. BIC Classification: PNFS; TJFC; TJFN; UT. Category: (G) General (US: Trade). Dimension: 235 x 155 x 9. Weight in Grams: 273. . 2014. Paperback. . . . . Codice articolo V9789400799141
Descrizione libro Condizione: New. The RF front-end - antenna combination is a vital part of a mobile phone. This book offers a unique account of adaptive RF front-ends. It includes an analysis on the impact of fluctuating environmental parameters, and a generic protection concept is presented. Series: Analog Circuits and Signal Processing. Num Pages: 153 pages, 10 black & white tables, biography. BIC Classification: PNFS; TJFC; TJFN; UT. Category: (G) General (US: Trade). Dimension: 235 x 155 x 9. Weight in Grams: 273. . 2014. Paperback. . . . . Books ship from the US and Ireland. Codice articolo V9789400799141