Adaptive RF Front-Ends for Hand-held Applications - download pdf or read online

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

ISBN-10: 9048199344

ISBN-13: 9789048199341

The RF front-end – antenna mixture is a crucial a part of a cellphone simply because its functionality is particularly proper 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 usually unpredictable.

Adaptive RF Front-Ends for handheld Applications offers an research at the effect of fluctuating environmental parameters. so that it will triumph over undesired habit various adaptive regulate tools are taken care of that make RF frond-ends extra resilient: adaptive impedance regulate, and adaptive energy control.

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

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Additional info for Adaptive RF Front-Ends for Hand-held Applications

Example text

Hence, for an accurate output signal Y, fully independent of D, both H1 and H2 must be very precise and KD must be exactly equal to H2. Therefore, feed forward can not be applied in controlling systems that need high precision. In this book we make use of control systems that are based on feedback in order to become insensitive to inaccuracies of the forward path, which is important for the following reasons. In case of adaptive impedance matching, treated in Chapter 3, small variations in component values can result in large variations of the matching impedance,1 especially for high-order matching networks that need to tune over a wide load impedance and frequency range.

When a network has multiple solutions to provide a desired match, each solution follows a different impedance path that results in a different insertion loss. Since insertion loss is difficult to detect, it can not easily be used as an optimization criterion for adaptive control. Therefore, optimum solutions needs to be found by using a priori knowledge on the (source and load impedance dependent) insertion loss of the network. ZINT_i Fig. 22) in which GM is the reflection coefficient of the matched port and GLOAD that of the mismatched load.

Hence, computation can be used to map the complex numbers from one domain in to the other, as well as to map the numbers from a Polar representation in to a Cartesian representation and vice versa. Im{Γ} X G - plane Z - plane |Z|⋅sin(jZ) |Γ|⋅sin(q Γ) |Z| qΓ 0 |Γ|⋅cos(q ) 1 Γ jZ 0 |Z|⋅cos(jZ) |Γ| Re{Γ} R Fig. 2 A Polar and Cartesian representation of the impedance Z and reflection coefficient G 2 The impedance of a receiving antenna exhibits a negative real part covering the left-handside of the Z-plane.

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


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