Microwaves

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

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

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

Adaptive RF Front-Ends for hand held Applications provides an research at the impression of fluctuating environmental parameters. in an effort to triumph over undesired habit diverse adaptive regulate tools are taken care of that make RF frond-ends extra resilient: adaptive impedance regulate, and adaptive energy control.

Several adaptive impedance keep an eye on concepts are mentioned, utilizing a priori wisdom on matching community homes, so that it will simplify strong 2-dimensional keep an eye on. A commonly used safeguard inspiration is gifted, according to adaptive strength regulate, 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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3, performed by Fidler and Thompson in [54]. 5) and RS L Fig. 6) These two equations, representing the impedance transfer functions f1 and f2, reveal that tuning the matching resistance RM by either C1, C2 or L affects XM, and vice versa, which illustrates the non-orthogonal tuning properties over the two dimensions. Further in-sight in the tuning properties of this network is obtained from deriving the matchable impedance for each variable element individually. 8) respectively. 10) These circular impedance curves are shown in Fig.

5 the properties of these networks will be explored in more detail in conjunction to adaptive control. 5 Insertion Loss Network insertion loss is important because it can partly undo the gain enhancement obtained from impedance matching. 21) in which Re{ZSERIES_ i} and Re{YSHUNT_ j} represent the loss resistance and loss conductance of the series and shunt branches, whereas Re{ZINT_ i} and Re{YINT_ i} represent the network resistance and admittance at the intermediate nodes of these branches as depicted in Fig.

3 Die Temperature Fluctuation Power amplifier die temperature is important because over-heating potentially causes thermal run-away of the device. Therefore, in this section we derive the operating conditions at which the die temperature is most extreme. The average die temperature TDIE can be expressed as a function of the ambient temperature TAMB, the thermal resistance RTH, and the dissipated power, that equals the difference between the DC power delivered by the supply PSUP and AC power delivered to the load PLOAD_n.

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