CMOS Low-Noise Amplifier Design for Reconfigurable Mobile Terminals release_v2dr5afqjvg5vd7m5yjqlxtfhy

by Dariusz Zbigniew Pienkowski, Georg Böck, Technische Universität Berlin, Technische Universität Berlin

Published by Technische Universität Berlin.



Communication standards developed in Europe, Japan and USA are not compatible with each other. This is a profound drawback particularly in the digital cellular telephony, where there is no common standard up to now. The variety of wireless standards leads to some disadvantages, therefore the need for reconfigurability seems to be evident. A reconfigurable terminal should be able to support different standards. Reasonable integration of different standards may include standards, which belong to the same family (e.g., GSM), but are developed in different continents. Such terminals have been already produced and a broad offer exists on the market. A rather new approach of the standard integration is the combination of different families of standards, for example between wireless data and digital cellular telephony like UMTS with WLAN or HIPERLAN. In this case, nearly all parameters defining a standard are different. In the scope of this work the multistandard, reconfigurable terminal is considered that supports the OFDM based WLAN standards (IEEE802.11 and Hiperlan/2) and the CDMA based UMTS FDD standard. Special consideration has been made for the receiver of this terminal. A reconfigurable hybrid architecture has been developed, rather than an architecture using many parallel switchable transceivers. Additionally to the hybrid architecture, a study on RF impairments is given. The second part of this work handles with transistor physics and low noise amplifier design for a reconfigurable receiver, defined earlier. Since the small FET sizes of state of the art sub-micron RF-MOS-technologies have low capacitance values, thus large inductors are needed for matching. Because of theirs large dimensions they are placed off-chip. For this reason, the pad capacitance can not be longer neglected in the design process. % It is shown that the noise figure of low-noise amplifiers can be improved considerably by a proper choice of passive components. A design methodology is introduced, which reduces the equivalent noise resista [...]
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Date   2005-06-17
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