Download Adaptive RF Front-Ends for Hand-held Applications by Andre van Bezooijen, Reza Mahmoudi, Arthur H.M. van Roermund PDF

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

ISBN-10: 9048199344

ISBN-13: 9789048199341

The RF front-end – antenna mix is an important a part of a cell phone simply because its functionality is especially appropriate to the hyperlink caliber among hand-set and mobile community base-stations. The RF front-end functionality suffers from alterations in working setting, like hand-effects, which are frequently unpredictable.

Adaptive RF Front-Ends for handheld Applications provides an research at the influence of fluctuating environmental parameters. to be able to triumph over undesired habit various adaptive keep an eye on tools are taken care of that make RF frond-ends extra resilient: adaptive impedance keep watch over, and adaptive strength control.

Several adaptive impedance keep an eye on innovations are mentioned, utilizing a priori wisdom on matching community homes, so as to simplify strong 2-dimensional keep watch over. A commonplace safeguard idea is gifted, in line with adaptive strength keep watch over, which improves the ruggedness of an influence amplifier or preserves its linearity below extremes. It contains over-voltage, over-temperature, and under-voltage protection.

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Extra resources for Adaptive RF Front-Ends for Hand-held Applications

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5). In addition, solutions that result in component values close to the boundary of their tuning range might get out of range due to load impedance variations. 1 Introduction 41 L Many C1 C2 L values give same ZM For a fixed L, two C1 C2 combinations give same ZM C2 C1 Fig. 3 The next section treats some aspects of robust control. 3 Robust Control The purpose of adaptive control can be defined, in general, as minimizing a cost function J(x), which defines a maximum error of the so-called normed vector space ||e(x)||, as a function of the variable x relative to a disturbance d where d is an element of a domain D.

D) Relationships Collector voltage (I) (b) Efficiency Clipping Distortion Talk time (1) Link quality (2) Die temperature (II) Collector current (III) (a) Avalanche instability Local heating Electro-thermal instability Blow-out Destructive breakdown (3) Fig. 1 The performance of a cellular phone RF front-end is affected by its fluctuating operating environment, which is visualized as a simplified chain of causes and effects l l l Ambient temperature The phone ambient temperature varies with changes in user and weather conditions.

For VSWR1 ¼ 1, 2, 3, and 4, Fig. 11). The corresponding minimum collector voltage magnitude is visualized in Fig. 6. 11) the maximum and minimum collector voltage magnitudes increase with increasing supply voltage USUP and, via the 10 4 |Ucol|MAX [V] 8 3 2 1 6 4 2 –180 –90 0 90 PhaseOfGamma_1 [degrees] 180 Fig. 5 Visualization of the collector voltage magnitude |UCOL|MAX as a function of the phase of gamma for VSWR1 ¼ 1, 2, 3, and 4. 4 Impact of Variables 21 |Uco|| ||MIN [V] 6 4 1 2 3 2 4 0 –180 –90 0 90 PhaseOfGamma_1 [degrees] 180 Fig.

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