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

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

Adaptive RF Front-Ends for hand held Applications offers an research at the effect of fluctuating environmental parameters. which will triumph over undesired habit various adaptive keep an eye on tools are handled that make RF frond-ends extra resilient: adaptive impedance keep watch over, and adaptive energy control.

Several adaptive impedance keep watch over strategies are mentioned, utilizing a priori wisdom on matching community houses, with the intention to simplify strong 2-dimensional keep watch over. A common security inspiration is gifted, in accordance with adaptive strength regulate, which improves the ruggedness of an influence amplifier or preserves its linearity less than extremes. It includes over-voltage, over-temperature, and under-voltage protection.

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In this example two stable solutions exist. However, if solution A is preferred over solution B, for instance because of lower network insertion loss, then convergence to the most desired solution is obtain only over the monotone part of f(x) given by xC < x < XMAX. As an alternative to Gradient Search, in this book optimization is achieved by so-called Direct Control characterized by two distinct aspects. Firstly, optimization to a minimum error is achieved by taking steps proportional to the Sign or the error 44 3 Adaptive Impedance Control CONVERGENCE TO A CONVERGENCE TO B f(x) B R A C ||e|| 0 xMIN x1 x2 x x3x4 x x xA x5x6 x xMAX x Fig.

However, if solution A is preferred over solution B, for instance because of lower network insertion loss, then convergence to the most desired solution is obtain only over the monotone part of f(x) given by xC < x < XMAX. As an alternative to Gradient Search, in this book optimization is achieved by so-called Direct Control characterized by two distinct aspects. Firstly, optimization to a minimum error is achieved by taking steps proportional to the Sign or the error 44 3 Adaptive Impedance Control CONVERGENCE TO A CONVERGENCE TO B f(x) B R A C ||e|| 0 xMIN x1 x2 x x3x4 x x xA x5x6 x xMAX x Fig.

4 Impact of Variables 23 100 90 TDIE [C] 1 2 3 80 4 70 –180 –90 0 90 PhaseOfGamma_1 [degrees] 180 Fig. 7 Visualization of the die temperature TDIE as a function of the phase of gamma for VSWR1 ¼ 1, 2, 3, and 4. 8 shows the die temperature as a function of mismatch. 24), the efficiency has a maximum for a mismatch phase of zero degrees, and increases with increasing VSWR. The amplifier efficiency is inverse proportional the supply voltage. 1. 24 2 Adaptive RF Front-Ends 40 4 30 Eff [%] 3 20 2 1 10 0 –180 –90 0 90 PhaseOfGamma_1 [degrees] 180 Fig.

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