Adaptive RF Front Ends for Hand held Applications

Adaptive RF Front-Ends for Hand-Held Applications presents an analysis on the impact of fluctuating environmental parameters.

Author: Andre van Bezooijen

Publisher: Springer Science & Business Media

ISBN: 9048199352

Category: Technology & Engineering

Page: 153

View: 623

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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.
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Adaptive RF Front Ends for Hand held Applications

Adaptive RF Front-Ends for Hand-Held Applications presents an analysis on the impact of fluctuating environmental parameters.

Author: Andre van Bezooijen

Publisher: Springer

ISBN: 9048199360

Category: Technology & Engineering

Page: 153

View: 480

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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.
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International Conference on Trends in Communications

Typical applications include fully digitised wireless handheld devices , from RF
front end onwards , xDSL processors that include adaptive , digital filtering and
layer 1/2 data processing . Entering the massive data throughput backbones , a ...

Author:

Publisher: IEEE

ISBN: UIUC:30112048596198

Category: Technology & Engineering

Page: 551

View: 759

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17th IEEE international conference on micro electro mechanical systems

2 mechanical suspension ABSTRACT tim we MEMS tunable capacitors have
been fabricated in a thin - film technology for ... in the frequency range of 1 to 6
GHz , making these devices very suitable as building blocks in many RF
applications . ... these MEMS capacitors are very suitable as tuning elements in
RF front - ends for hand - held mobile communication devices . are 2 . ...
controlled oscillators , tunable filters and antennas , and adaptive impedance
matching circuits [ 1-3 ] .

Author: IEEE International Conference on Micro Electro Mechanical Systems 17, 2004, Maastricht, The Netherlands

Publisher:

ISBN: 078038265X

Category:

Page: 868

View: 794

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Adaptive Low Power Circuits for Wireless Communications

ADAPTIVE. VOLTAGE-CONTROLLED. OSCILLATORS. AND. ADAPTIVE. RF.
FRONT-ENDS. Today's portable communication devices enable a growing
variety of applications, ranging from text messaging, telephony and audio to full
video.

Author: Aleksandar Tasic

Publisher: Springer Science & Business Media

ISBN: 9781402052507

Category: Technology & Engineering

Page: 221

View: 782

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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.
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Radio Frequency Identification

from System to Applications Mamun Bin Ibne Reaz ... The RFID read‐er features
a robust impact resistant IP67 casing, adaptive RF front end for cancellation of
reflections from large metal surface in the harvester head and EPC Global
Reader ...

Author: Mamun Bin Ibne Reaz

Publisher: BoD – Books on Demand

ISBN: 9789535111436

Category: Technology & Engineering

Page: 460

View: 388

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RFID based application creates tremendous new business opportunities such as the support of independent living of elderly and disabled persons, efficient supply chains, efficient anti-counterfeiting and better environmental monitoring. RFID data management, scalable information systems, business process reengineering, and evaluating investments are emerging as significant technical challenges to applications underpinned by new developments in RFID technology. This book presents the contributions from world leading experts on the latest developments and state-of-the-art results in the RFID field to address these challenges. The book offers a comprehensive and systematic description of technologies, architectures, and methodologies of various efficient, secure, scalable, and reliable RFID and RFID based applications.
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Integrated Circuits for Wireless Communications

... 48 – 53 Adaptation in receiver implementation power - adaptive transceivers ,
31 standard - adaptive transceivers , 32 Advanced mobile ... mobile radio , 37 –
41 Balanced double layer stripline ( BDLS ) type filter , dielectric resonator
application , 522 – 3 Bandpass filters ... 30 Baseband unit of hand - held portable
equipment , 587 - 88 Base station technologies , 485 BiCMOS RF front - end
integrated ...

Author: Asad A. Abidi

Publisher: Wiley-IEEE Press

ISBN: UOM:39015063648243

Category: Technology & Engineering

Page: 674

View: 103

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Electrical Engineering Integrated Circuits for Wireless Communications High-frequency integrated circuit design is a booming area of growth that is driven not only by the expanding capabilities of underlying circuit technologies like CMOS, but also by the dramatic increase in wireless communications products that depend on them. Integrated Circuits for Wireless Communications includes seminal and classic papers in the field and is the first all-in-one resource to address this increasingly important topic. Internationally known and highly regarded in the field, editors Asad Abidi, Paul Gray, and Robert G. Meyer have meticulously compiled more than 100 papers and articles covering the very latest high-level integrated circuits techniques and solutions in use today. Integrated Circuits for Wireless Communications is devised expressly to provide IC design engineers, system architects, and integrators with a practical understanding of subjects ranging from architecture choices for integrated transceivers to actual circuit designs in all viable IC technologies, such as bipolar, CMOS, and GaAs. The papers selected represent a breadth of coverage and level of expertise that is simply unmatched in the field. Topics covered include: Radio architectures Receivers Transmitters and transceivers Power amplifiers and RF switches Oscillators Passive components Systems applications
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Multi standard Radio Transceiver Architectures and Radio Frequency Front end Design

Abstract: Handheld wireless devices are becoming extremely popular as they continue to benefit from unprecedented levels of integration.

Author: Hyung Joon Kim

Publisher:

ISBN: OCLC:60379157

Category: Radio

Page:

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Abstract: Handheld wireless devices are becoming extremely popular as they continue to benefit from unprecedented levels of integration. They are becoming more and more compact achieving multi-functions and meeting a multitude of different wireless standards. Great strides have been achieved with the digital baseband/Mac part of a portable handheld wireless solution while the big challenge confronting current and future wireless chipset development remains in the radio part having to achieve multi-band and multi-standard operation at low power consumption and very low bill of material. The dissertation focuses on the development of new radio architectures for wireless applications and reports a configurable wireless radio receiver architecture and two configurable radio transceivers suitable for single chip integration. The new architectures are optimized to achieve maximum hardware share amongst the different wireless standards, while consuming minimum levels of power. The receiver is intended for convergent EGSM, WCDMA and Wi-Fi applications. It is configured as a low IF receiver in the EGSM mode and as a zero-IF receiver for either the WCDMA or the Wi-Fi mode. One of the two transceivers developed in the dissertation is designed for Bluetooth, 802.11b, and 802.11a. In the Bluetooth mode, it operates as a low-IF and in the WLAN mode it operates as a zero-IF. The second transceiver achieves concurrent Bluetooth and Wi-Fi operation allowing one, for example, to browse the Internet with Wi-Fi while at the same time synchronize with others in the room with Bluetooth. This transceiver exploits Adaptive Frequency Hopping, originally introduced for the purpose of ensuring coexistence between Bluetooth and Wi-Fi, to achieve two objectives: 1) develop a new radio architecture with maximum hardware share and 2) de-multiplex Bluetooth and Wi-Fi signals at the transceiver front end. The dissertation performs complete link budget analysis of all newly proposed radio architectures mapping system level requirements to the sub-system and block and circuit levels. The results are tabulated. Finally, we discuss design and experimental results of an RF front-end achieving design requirements within the performance ranges required by the radio architectures discussed in the dissertation. The design was done in a SiGe BiCMOS deep sub-micron technology.
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IEICE Transactions on Electronics

The formulation includes a realistic noise model for the receiving front - end
amplifiers as well as external interference ... adaptive beamforming applications
employing arrays of 2 coupled dipole antennas and a realistic front - end
amplifier ... [ 2 ] R.G. Vaughan and J.B. Andersen , “ Antenna diversity in mobile
communications , ” IEEE Trans . ... and W. Wiesbeck , “ Analysis of compact
arrays for MIMO based on a complete RF system model , ” IEEE Topical Conf . on
Wireless Commun .

Author:

Publisher:

ISBN: UCSD:31822033919150

Category: Electronics

Page:

View: 907

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Wireless Personal Communications

A Low - Power Handheld Frequency - Hopped Spread Spectrum Transceiver
Hardware Architecture Jonathan Min , Ahmadreza ... and adaptive power control ,
for achieving robust wireless digital data transmission over multipath fading
channels . ... implementation is being developed for the entire transceiver
including the 900 MHz radio frequency ( RF ) front - end . ... applications such as
cellular and micro - cellular radios and telephones , wireless LANs , and wireless
PBX systems .

Author: Theodore S. Rappaport

Publisher: Springer

ISBN: UOM:39015047434330

Category: Technology & Engineering

Page: 266

View: 206

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"Well informed people know it is impossible to transmit the voice over wires, and that were it possible to do so, the thing would be ofno practical value. " from an editorial in the Boston Post -1865 Fortunately for the telecommunications industry, the unknown author of the above statement turned out to be very mistaken indeed. Even as he spoke, Alexander Graham Bell was achieving the impossible, with a host of competing inventors close behind. The communications revolution which ensued has changed the way in which we live and work, and the way in which we view the world around us. Wired telephone lines now encircle the globe, allowing instantaneous transmission of voice and data. Events from Times Square to Red Square are now as accessible as events on the local courthouse lawn. The advent of wireless communications has extended Bell's revolution to another domain. Personal communications promises voice, data and images which are accessible everywhere. Although predictions are dangerous, a look back over the last decade reveals spectacular growth. In the United States alone, there are now over 50 million cordless phones in use throughout the country -at least one cordless phone for every 3 households - and nearly 20 million pocket pagers. U. S. Cellular telephone service, launched commercially in 1984, has experienced 30-40% annual growth rates despite a sluggish economy.
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Multifunctional Adaptive Microwave Circuits and Systems

This can be important for applications requiring large RF voltage swings . ...
Some applications , especially in wireless handheld devices , would prefer to
have low control voltages commensurate ... as low as 2.7 V. The tradeoff with
control voltage is especially important with respect to linearity concerns in the RF
front - end .

Author: Michael Bernard Steer

Publisher: SciTech Publishing

ISBN: STANFORD:36105131671682

Category: Technology & Engineering

Page: 460

View: 710

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This book is an introduction to Multi-functional, Adaptive Radio Radar and Sensor systems. The book presents the findings of the five year project entitled "MARRS: Multifunctional Adaptive Radio and Sensors" that ran from 2001 to 2008. It presents a systematic approach to the system level design required to develop MARRS technology.
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International Aerospace Abstracts

The new architecture for implementing mobile telephony base stations has the
potential of offering many benefits : great ... A very important problem in
designing software radio applications is the need to estimate the required
complexity of ... and to generic RF and digital technologies focused on third -
generation Universal Mobile Telecommunications Systems . Software base
stations , including their synergies with adaptive ( often now termed soft )
antennas , are also addressed .

Author: American institute of aeronautics and astronautics

Publisher:

ISBN: 00205842

Category:

Page:

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Portable Design

11 a / b / g silicon Fully assembled evaluation boards are form based on the
Atheros AR5006XS enables mobile phones , PDAs ... 11a , b , or g op - Front -
end RF modules provide ( DVK ) and a board support package for eration in the 2
. ... 13 - um CMOS For cellular - handset applications , the nects to the DVK ' s
VLIO connector process , the chip integrates RF , modem ... Features include
adaptive of 20 dB , and standby / bias control logic technology , the uWatt
programmable jitter ...

Author:

Publisher:

ISBN: UOM:39015058771190

Category: Mobile computing

Page:

View: 670

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Subsurface Sensing Technologies and Applications II

Experimental study of near surface radar imaging of buried objects with adaptive
focussed synthetic aperture ... First , it is generally a hand held system and it is
not possible to position precisely the radar antenna in space for the imaging
process , that is to know at each time the exact position . ... This is generally
difficult on a technical point of view because the RF front - end acts as a low pass
filter .

Author: Society of Photo-optical Instrumentation Engineers

Publisher: Society of Photo Optical

ISBN: UOM:39015050328254

Category: Technology & Engineering

Page: 668

View: 535

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2000 IEEE Radio Frequency Integrated Circuits RFIC Symposium

The second is a hand held GPS radio commonly sold in sporting good and
discount stores . ... mW CMOS GPS Receiver ” , International Solid State Circuits
Conference , paper 8.11 , 1998 Amoroso F. , “ Adaptive A / D Converter ...
Summary Gemini / Pisces is a two - chip GPS receiver front - end housed in a
single 17.2 mm by 17.2 mm , 80 pin , plastic quad ... The device is suitable for
handheld applications with a low 360 mW of power dissipation at a nominal
supply voltage of 3 volts .

Author: IEEE Microwave Theory and Techniques Society

Publisher: IEEE Standards Office

ISBN: 0780362810

Category: Technology & Engineering

Page: 286

View: 418

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Dissertation Abstracts International

Adviser : Chein - I Chang Order Number DA3283819 This dissertation
investigates the applications of hyperspectral image processing ... In this
dissertation , two hyperspectral image processing algorithms , Adaptive Causal
Anomaly Detection ( ACAD ) used for anomaly ... frequency modulation ( FM )
radio receiver front - end used as an expansion of a variety of portable and
handheld audio devices .

Author:

Publisher:

ISBN: STANFORD:36105131549631

Category: Dissertations, Academic

Page:

View: 508

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Intelligent Integrated Microsystems

1 : Schematic variation of efficiency with magnitude , depending on the proximity
of the receiver and the frequency for narrowband and ... Variable antenna
impedance : In handheld units , the 5 . ... DARPA ' s Intelligent RF Front End
program , Zin = 140 - j50 ohms suggests that there can be further benefits of
adaptive Zin = 108 ... 0MHz ) to radar applications ) ; this can be a major benefit
in spacecraft Fig .

Author: Ravindra A. Athale

Publisher: Society of Photo Optical

ISBN: UOM:39015064774535

Category: Political Science

Page: 194

View: 471

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Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.
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Cognitive Radio Technology

The inherent constraints of UWB limit its use to very local signaling , or
specialized applications . ... 5.9 Adaptive Spectrum Implications for Cognitive
Radio Hardware Another aspect of cognitive radio operation will be the ... for
wideband , handheld , energy - constrained devices that must operate in the
presence of highpower neighbors . ... Starting with the radio frequency ( RF ) front
- end , several driving performance characteristics generally drive energy
consumption and cost .

Author: Steven Kinney

Publisher: Newnes

ISBN: UOM:39015064747242

Category: Technology & Engineering

Page: 622

View: 216

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Publisher description
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