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.
General
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