Adaptive RF Front-Ends for Hand-held Applications
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.
| Autor: | Mahmoudi, Reza van Bezooijen, Andre van Roermund, Arthur H.M. |
|---|---|
| ISBN: | 9789048199341 |
| Sprache: | Englisch |
| Seitenzahl: | 153 |
| Produktart: | Gebunden |
| Verlag: | Springer Netherland |
| Veröffentlicht: | 05.11.2010 |
| Schlagworte: | Adaptive RF front-ends Antenna hand-effects Impedance control Mobile communication |