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CMOS design enhancement techniques for RF receivers. Analysis, design and implementation of RF receivers with component enhancement and component reduction for improved sensitivity and reduced cost, using CMOS technology.

By Nandi Logan

Abstract

Silicon CMOS Technology is now the preferred process for low power wireless\ud communication devices, although currently much noisier and slower than comparable\ud processes such as SiGe Bipolar and GaAs technologies. However, due to ever-reducing\ud gate sizes and correspondingly higher speeds, higher Ft CMOS processes are\ud increasingly competitive, especially in low power wireless systems such as Bluetooth,\ud Wireless USB, Wimax, Zigbee and W-CDMA transceivers. With the current 32 nm gate\ud sized devices, speeds of 100 GHz and beyond are well within the horizon for CMOS\ud technology, but at a reduced operational voltage, even with thicker gate oxides as\ud compensation.\ud This thesis investigates newer techniques, both from a systems point of view and at a\ud circuit level, to implement an efficient transceiver design that will produce a more\ud sensitive receiver, overcoming the noise disadvantage of using CMOS Silicon. As a\ud starting point, the overall components and available SoC were investigated, together\ud with their architecture.\ud Two novel techniques were developed during this investigation. The first was a high\ud compression point LNA design giving a lower overall systems noise figure for the\ud receiver. The second was an innovative means of matching circuits with low Q\ud components, which enabled the use of smaller inductors and reduced the attenuation\ud loss of the components, the resulting smaller circuit die size leading to smaller and\ud lower cost commercial radio equipment. Both these techniques have had patents filed by the\ud University.\ud Finally, the overall design was laid out for fabrication, taking into account package\ud constraints and bond-wire effects and other parasitic EMC effects

Topics: RF Receivers, Inductors, Noise Figure, Component Quality Factor, CMOS, Sensitivity, Compression Point, LNA, UMTS
Publisher: School of Engineering, Design and Technology
Year: 2010
OAI identifier: oai:bradscholars.brad.ac.uk:10454/5188
Provided by: Bradford Scholars

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