Adaptive RF Front-Ends for Hand-held Applications

by Andre van Bezooijen, Reza Mahmoudi & Arthur H.M. van Roermund
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eBook

Publisher: Springer Netherlands

Series: Analog Circuits and Signal Processing

Publication Date: March 07, 2016

ISBN: 9789048199358

Binding: Kobo eBook

Availability: 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.