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Author: Andre van Bezooijen
Publisher: Springer Science & Business Media
ISBN: 9048199352
Category : Technology & Engineering
Languages : en
Pages : 169
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Book Description
The RF front-end – antenna combination is a vital part of a mobile phone because its performance is very relevant to the link quality between hand-set and cellular network base-stations. The RF front-end performance suffers from changes in operating environment, like hand-effects, that are often unpredictable. Adaptive RF Front-Ends for Hand-Held Applications presents an analysis on the impact of fluctuating environmental parameters. In order to overcome undesired behavior two different adaptive control methods are treated that make RF frond-ends more resilient: adaptive impedance control, and adaptive power control. Several adaptive impedance control techniques are discussed, using a priori knowledge on matching network properties, in order to simplify robust 2-dimensional control. A generic protection concept is presented, based on adaptive power control, which improves the ruggedness of a power amplifier or preserves its linearity under extremes. It comprises over-voltage, over-temperature, and under-voltage protection.
Author: Andre van Bezooijen
Publisher: Springer Science & Business Media
ISBN: 9048199352
Category : Technology & Engineering
Languages : en
Pages : 169
Get Book Here
Book Description
The RF front-end – antenna combination is a vital part of a mobile phone because its performance is very relevant to the link quality between hand-set and cellular network base-stations. The RF front-end performance suffers from changes in operating environment, like hand-effects, that are often unpredictable. Adaptive RF Front-Ends for Hand-Held Applications presents an analysis on the impact of fluctuating environmental parameters. In order to overcome undesired behavior two different adaptive control methods are treated that make RF frond-ends more resilient: adaptive impedance control, and adaptive power control. Several adaptive impedance control techniques are discussed, using a priori knowledge on matching network properties, in order to simplify robust 2-dimensional control. A generic protection concept is presented, based on adaptive power control, which improves the ruggedness of a power amplifier or preserves its linearity under extremes. It comprises over-voltage, over-temperature, and under-voltage protection.
Author: Aleksandar Tasic
Publisher: Springer Science & Business Media
ISBN: 1402052502
Category : Technology & Engineering
Languages : en
Pages : 232
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Book Description
With a billion – soon to be two billion - cellular telephones in circulation, the next challenge is to make cellular radio functions adaptive to their environment. This book provides a comprehensive theoretical framework for optimizing performance, discussing joint optimization of Noise Figure and Input Intercept Point in receiver systems. Also examined are original techniques to optimize voltage controlled oscillators and low-noise amplifiers, minimizing power consumption while maintaining adequate system performance.
Author: Gernot Hueber
Publisher: John Wiley & Sons
ISBN: 1118102207
Category : Technology & Engineering
Languages : en
Pages : 608
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Book Description
Summarizes cutting-edge physical layer technologies for multi-mode wireless RF transceivers. Includes original contributions from distinguished researchers and professionals. Covers cutting-edge physical layer technologies for multi-mode wireless RF transceivers. Contributors are all leading researchers and professionals in this field.
Author: Jeffrey L. Hilbert
Publisher: CRC Press
ISBN: 1498718922
Category : Technology & Engineering
Languages : en
Pages : 342
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Book Description
An Industry Perspective on Key Tunable Technologies and Applications Tunable RF Components and Circuits: Applications in Mobile Handsets provides a technical introduction to the state of the art in tunable radio frequency (RF) components, circuits, and applications and discusses the foundational work that has been done to date. Leading practitioners in the field share their expertise on tunable devices in mobile handset applications. Through these practical viewpoints, readers discover how to use tunable RF techniques and devices to develop successful product designs. A substantial portion of the book focuses on antennas and antenna tuning, reflecting the dominance of the antenna tuning application in today’s commercial market for tunable RF. The book explains how RF-microelectromechanical systems (RF-MEMS), barium strontium titinate (BST), silicon-on-insulator (SOI) field effect transistors (FETs), and high-performance complementary metal oxide semiconductors (CMOS) are used as enabling technologies for tunable functions in current and next-generation radio architectures. The book also describes power amplifier envelope tracking, an emerging and important technique for improving efficiency; presents a network operator’s perspective on the evolution of the handset front end; and explores emerging approaches to production testing of wireless devices.
Author: Jeffrey L. Hilbert
Publisher: CRC Press
ISBN: 9781498718899
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
This book provides a comprehensive review of the state of the art in tunable RF for mobile handsets. With chapters contributed by industry experts who collectively represent the vast majority of today’s tunable RF product revenue, the book supplies essential background in the underlying technologies and theories to give readers the tools necessary to ride the tunable RF wave successfully. Numerous examples and case studies demonstrate the application of the technologies and highlight the differences and trade-offs between alternate technologies and implementation methodologies.
Author: Refet Firat Yazicioglu
Publisher: Springer Science & Business Media
ISBN: 1402090935
Category : Technology & Engineering
Languages : en
Pages : 172
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Book Description
Biopotential Readout Circuits for Portable Acquisition Systems describes one of the main building blocks of such miniaturized biomedical signal acquisition systems. The focus of this book is on the implementation of low-power and high-performance integrated circuit building blocks that can be used to extract biopotential signals from conventional biopotential electrodes. New instrumentation amplifier architectures are introduced and their design is described in detail. These amplifiers are used to implement complete acquisition demonstrator systems that are a stepping stone towards practical miniaturized and low-power systems.
Author: Meghanathan, Natarajan
Publisher: IGI Global
ISBN: 146664222X
Category : Technology & Engineering
Languages : en
Pages : 370
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Book Description
Radio interference is a problem that has plagued air communication since its inception. Advances in cognitive radio science help to mitigate these concerns. Cognitive Radio Technology Applications for Wireless and Mobile Ad Hoc Networks provides an in-depth exploration of cognitive radio and its applications in mobile and/or wireless network settings. The book combines a discussion of existing literature with current and future research to create an integrated approach that is useful both as a textbook for students of computer science and as a reference book for researchers and practitioners engaged in solving the complex problems and future challenges of cognitive radio technologies.
Author: Tapani Ryhänen
Publisher: Cambridge University Press
ISBN: 1139483765
Category : Technology & Engineering
Languages : en
Pages : 283
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Book Description
Explore the potential for nanotechnologies to transform future mobile and Internet communications. Based on a research collaboration between Nokia, Helsinki University of Technology, and the University of Cambridge, here leading researchers review the current state-of-the art and future prospects for: • Novel multifunctional materials, dirt repellent, self-healing surface materials, and lightweight structural materials capable of adapting their shape • Portable energy storage using supercapacitor-battery hybrids based on new materials including carbon nanohorns and porous electrodes, fuel cell technologies, energy harvesting and more efficient solar cells • Electronics and computing advances reaching beyond IC scaling limits, new computing approaches and architectures, embedded intelligence and future memory technologies. • Nanoscale transducers for mechanical, optical and chemical sensing, sensor signal processing, and nanoscale actuation • Nanoelectronics to create ultrafast and adaptive electronics for future radio technologies • Flat panel displays with greater robustness, improved resolution, brightness and contrast, and mechanical flexibility • Manufacturing and innovation processes, plus commercialization of nanotechnologies.
Author: Mike Golio
Publisher: CRC Press
ISBN: 0203503740
Category : Technology & Engineering
Languages : en
Pages : 442
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Book Description
The field of microwave engineering has undergone a radical transformation in recent years, as commercial wireless endeavors overtook defense and government work. The modern microwave and RF engineer must be knowledgeable about customer expectations, market trends, manufacturing technologies, and factory models to a degree that is unprecedented. Unfortunately, most of the available literature does not reflect this fact, but remains focused on high-performance, low-volume applications. Microwave and RF Product Applications helps resolve that deficiency. Editor Mike Golio culled its chapters from his bestselling RF and Microwave Handbook, incorporated critical updates contributed by the original authors, and organized the chapters into a practical, tightly focused reference. A complete table of contents at the front of the text makes finding specific answers quick and easy, and detailed lists of references in each chapter provide convenient access to the relevant expert literature. For engineers in industry, government, or academia, Microwave and RF Product Applications provides insight and information that may be outside their area of expertise. For managers, marketers, and technical support personnel, it builds a better understanding of the fields that drive and are affected by their decisions.
Author: Ahmed A. Youssef
Publisher: Springer Science & Business Media
ISBN: 9048186048
Category : Technology & Engineering
Languages : en
Pages : 168
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Book Description
Nanometer CMOS RFICs for Mobile TV Applications focuses on how to break the trade-off between power consumption and performance (linearity and noise figure) by optimizing the mobile TV front-end dynamic range in three hierarchical levels: the intrinsic MOSFET level, the circuit level, and the architectural level. It begins by discussing the fundamental concepts of MOSFET dynamic range, including nonlinearity and noise. It then moves to the circuit level introducing the challenges associated with designing wide-dynamic range, variable-gain, broadband low-noise amplifiers (LNAs). The book gives a detailed analysis of a new noise-canceling technique that helps CMOS LNAs achieve a sub - 2 dB wideband noise figure. Lastly, the book deals with the front-end dynamic range optimization process from the systems perspective by introducing the active and passive automatic gain control (AGC) mechanism.
