Adaptive RF Front-Ends for Hand-held Applications: [Electronic resource] / by Andre van Bezooijen, Reza Mahmoudi, Arthur van Roermund.
Tipo de material: TextoSeries Analog Circuits and Signal ProcessingDescripción: XV, 200 p.: 100 illus. online resourceISBN: 9789048199358 99789048199358Tema(s): ENGINEERING | MICROWAVES | MICROWAVES, RF AND OPTICAL ENGINEERING | DATA TRANSMISSION SYSTEMS | CIRCUITS AND SYSTEMS | SOLID STATES PHYSICS | IMPUT, OUTPUT AND DATA COMMUNICATIONS | SYSTEMS ENGINEERINGClasificación CDD: 621.3815 Recursos en línea: ir a documentoTipo de ítem | Ubicación actual | Colección | Signatura | Info Vol | Copia número | Estado | Fecha de vencimiento | Código de barras | Reserva de ítems |
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DOCUMENTOS DIGITALES | Biblioteca Jorge Álvarez Lleras | Digital | 621.3815 223 (Navegar estantería) | Ej. 1 | 1 | Disponible | D000174 |
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.
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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