Analog Circuits and Signal Processing

van Bezooijen, Andre; Mahmoudi, Reza; van Roermund, Arthur H.M.

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.

Details

Published by: Springer

Publication Date: 2014-12-13

Format: Paperback

ISBN-13: 9789400799141

DOI: 10.1007/978-90-481-9935-8

Dimensions: 235cm x155cm

Pages: 153