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A Poly-phased, Time-interleaved Radio Frequency Digital-to-analog Converter (Poly-TI-RF-DAC)

A Poly-phased, Time-interleaved Radio Frequency Digital-to-analog Converter (Poly-TI-RF-DAC)
A Book

by Vipul J. Patel

  • Publisher : Unknown Publisher
  • Release : 2017
  • Pages : 89
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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With increasing data rates and new communication standards owing to substantial advancements in digitizing and signal processing capabilities over the last century, the radio spectrum is increasingly becoming a finite and expensive resource. Furthermore, radar systems and 5G communication systems have revealed the need for gigahertz-frequency signal generation with flexible frequency planning and minimal spurious emissions. Advanced digital-to-analog converters (DACs), along with associated filtering, are critical enablers of these new systems and play a key role in meeting stringent system requirements. In conventional implementations, however, high quality filters are specific to one frequency band thereby limiting their operational agility. Therefore, a DAC architecture that removes undesired image replicas, mixer sidebands, and harmonic nonlinearities is an essential component for flexible frequency synthesis as it allows for reduced filtering requirements while enabling new software-defined transmitter techniques.This dissertation aims to provide a quantitative study and analysis of a poly-phased, time-interleaved Nyquist radio frequency digital-to-analog converter (Poly-TI-RF-DAC) for use in spectrum-agile and software-defined transmitters. Beginning with the fundamental understanding of high-speed DAC capabilities and limitations, the mathematical and behavioral analyses give insight into the signal, sideband, and image replica locations of the proposed architecture. Additionally, the use of a mixing DAC as the core structure is discussed along with how nonlinearities can be canceled with the appropriate choice of frequency planning.

Radio-Frequency Digital-to-Analog Converters

Radio-Frequency Digital-to-Analog Converters
Implementation in Nanoscale CMOS

by Morteza S Alavi,Jaimin Mehta,Robert Bogdan Staszewski

  • Publisher : Academic Press
  • Release : 2016-11-18
  • Pages : 302
  • ISBN : 0128025034
  • Language : En, Es, Fr & De
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With the proliferation of wireless networks, there is a need for more compact, low-cost, power efficient transmitters that are capable of supporting the various communication standards, including Bluetooth, WLAN, GSM/EDGE, WCDMA and 4G of 3GPP cellular. This book describes a novel idea of RF digital-to-analog converters (RFDAC) and demonstrates how they can realize all-digital, fully-integrated RF transmitters that support all the current multi-mode and multi-band communication standards. With this book the reader will: Understand the challenges of realizing a universal CMOS RF transmitter Recognize the design issues and the advantages and disadvantages related to analog and digital transmitter architectures Master designing an RF transmitter from system level modeling techniques down to circuit designs and their related layout know-hows Grasp digital polar and I/Q calibration techniques as well as the digital predistortion approaches Learn how to generate appropriate digital I/Q baseband signals in order to apply them to the test chip and measure the RF-DAC performance. Highlights the benefits and implementation challenges of software-defined transmitters using CMOS technology Includes various types of analog and digital RF transmitter architectures for wireless applications Presents an all-digital polar RFDAC transmitter architecture and describes in detail its implementation Presents a new all-digital I/Q RFDAC transmitter architecture and its implementation Provides comprehensive design techniques from system level to circuit level Introduces several digital predistortion techniques which can be used in RF transmitters Describes the entire flow of system modeling, circuit simulation, layout techniques and the measurement process

Studies on Selected Topics in Radio Frequency Digital-to-Analog Converters

Studies on Selected Topics in Radio Frequency Digital-to-Analog Converters
A Book

by Mohammad Reza Sadeghifar

  • Publisher : Linköping University Electronic Press
  • Release : 2019-10-14
  • Pages : 112
  • ISBN : 9176850307
  • Language : En, Es, Fr & De
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The network latency in fifth generation mobile technology (5G) will be around one millisecond which is much lower than in 4G technology. This significantly faster response time together with higher information capacity and ultra-reliable communication in 5G technology will pave the way for future innovations in a smart and connected society. This new 5G network should be built on a reasonable wireless infrastructure and 5G radio base-stations that can be vastly deployed. That is, while the electrical specification of a radio base-station in 5G should be met in order to have the network functioning, the size, weight and power consumption of the radio system should be optimized to be able to commercially deploy these radios in a huge network. As the number of antenna elements increases in massive multiple-input multiple-output based radios such as in 5G, designing true multi-band base-station radios, with efficient physical size, power consumption and cost in emerging cellular bands especially in mid-bands (frequencies up to 10~GHz), is becoming a challenge. This demands a hard integration of radio components; particularly the radio's digital application-specific integrated circuits (ASIC) with high-performance energy-efficient multi-band data converters. In this dissertation radio frequency digital-to-analog converter (RF DAC) and semi-digital finite-impulse response (FIR) filter digital-to-analog converter has been studied. Different techniques are used in these structures to improve the transmitter's overall performance. In the RF DAC part, a radio frequency digital-to-analog converter solution is presented, which is capable of monolithic integration into today's digital ASIC due to its digital-in-nature architecture, while fulfills the stringent requirements of cellular network radio base station linearity and bandwidth. A voltage-mode conversion method is used as output stage, and configurable mixing logic is employed in the data path to create a higher frequency lobe and utilize the output signal in the first or the second Nyquist zone and hence achieving output frequencies up to the sample rate. In the semi-digital FIR part, optimization problem formulation for semi-digital FIR digital-to-analog converter is investigated. Magnitude and energy metrics with variable coefficient precision are defined for cascaded digital Sigma-Delta modulators, semi-digital FIR filter, and Sinc roll-off frequency response of the DAC. A set of analog metrics as hardware cost is also defined to be included in semi-digital FIR DAC optimization problem formulation. It is shown that hardware cost of the semi-digital FIR DAC, can be reduced by introducing flexible coefficient precision in filter optimization while the semi-digital FIR DAC is not over-designed either. Different use cases are selected to demonstrate the optimization problem formulations. A combination of magnitude metric, energy metric, coefficient precision and analog metric are used in different use cases of the optimization problem formulation and solved to find out the optimum set of analog FIR taps. Moreover, a direct digital-to-RF converter (DRFC) is presented in this thesis where a semi-digital FIR topology utilizes voltage-mode RF DAC cells to synthesize spectrally clean signals at RF frequencies. Due to its digital-in-nature design, the DRFC benefits from technology scaling and can be monolithically integrated into advance digital VLSI systems. A fourth-order single-bit quantizer bandpass digital Sigma-Delta modulator is used preceding the DRFC, resulting in a high in-band signal-to-noise ratio (SNR). The out-of-band spectrally-shaped quantization noise is attenuated by an embedded semi-digital FIR filter. The RF output frequencies are synthesized by a configurable voltage-mode RF DAC solution with a high linearity performance. A compensation technique to cancel the code-dependent supply current variation in voltage-mode RF DAC for radio frequency direct digital frequency synthesizer is also presented in this dissertation and is studied analytically. The voltage-mode RF DAC and the compensation technique are mathematically modeled and system-level simulation is performed to support the analytical discussion.

Radio-Frequency Digital-to-Analog Converters

Radio-Frequency Digital-to-Analog Converters
Implementation in Nanoscale CMOS

by Morteza S Alavi,Jaimin Mehta,Robert Bogdan Staszewski

  • Publisher : Academic Press
  • Release : 2016-11-18
  • Pages : 302
  • ISBN : 0128025034
  • Language : En, Es, Fr & De
GET BOOK

With the proliferation of wireless networks, there is a need for more compact, low-cost, power efficient transmitters that are capable of supporting the various communication standards, including Bluetooth, WLAN, GSM/EDGE, WCDMA and 4G of 3GPP cellular. This book describes a novel idea of RF digital-to-analog converters (RFDAC) and demonstrates how they can realize all-digital, fully-integrated RF transmitters that support all the current multi-mode and multi-band communication standards. With this book the reader will: Understand the challenges of realizing a universal CMOS RF transmitter Recognize the design issues and the advantages and disadvantages related to analog and digital transmitter architectures Master designing an RF transmitter from system level modeling techniques down to circuit designs and their related layout know-hows Grasp digital polar and I/Q calibration techniques as well as the digital predistortion approaches Learn how to generate appropriate digital I/Q baseband signals in order to apply them to the test chip and measure the RF-DAC performance. Highlights the benefits and implementation challenges of software-defined transmitters using CMOS technology Includes various types of analog and digital RF transmitter architectures for wireless applications Presents an all-digital polar RFDAC transmitter architecture and describes in detail its implementation Presents a new all-digital I/Q RFDAC transmitter architecture and its implementation Provides comprehensive design techniques from system level to circuit level Introduces several digital predistortion techniques which can be used in RF transmitters Describes the entire flow of system modeling, circuit simulation, layout techniques and the measurement process

Official Gazette of the United States Patent and Trademark Office

Official Gazette of the United States Patent and Trademark Office
Patents

by United States. Patent and Trademark Office

  • Publisher : Unknown Publisher
  • Release : 1996-11
  • Pages : 329
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Interleaving Concepts for Digital-to-Analog Converters

Interleaving Concepts for Digital-to-Analog Converters
Algorithms, Models, Simulations and Experiments

by Christian Schmidt

  • Publisher : Springer
  • Release : 2019-07-19
  • Pages : 245
  • ISBN : 3658272643
  • Language : En, Es, Fr & De
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Modern complementary metal oxide semiconductor (CMOS) digital-to-analog converters (DACs) are limited in their bandwidth due to technological constraints. These limitations can be overcome by parallel DAC architectures, which are called interleaving concepts. Christian Schmidt analyzes the limitations and the potential of two innovative DAC interleaving concepts to provide the basis for a practical implementation: the analog multiplexing DAC (AMUX-DAC) and the frequency interleaving DAC (FI-DAC). He presents analytical and discrete-time models as a theoretical foundation and develops digital signal processing (DSP) algorithms to compensate the analog impairments. Further, he quantifies the impact of various limiting parameters with numerical simulations and verifies both concepts in laboratory experiments. About the Author: Christian Schmidt works at the Fraunhofer Heinrich-Hertz-Institute, Berlin, Germany, on innovative solutions for broadband signal generation in the field of optical communications. The studies for his dissertation were carried out at the Technische Universität Berlin and at the Fraunhofer Heinrich-Hertz-Institute, both Berlin, Germany.

High Frequency Communication and Sensing

High Frequency Communication and Sensing
Traveling-Wave Techniques

by Ahmet Tekin,Ahmed Emira

  • Publisher : CRC Press
  • Release : 2018-09-03
  • Pages : 152
  • ISBN : 1482207125
  • Language : En, Es, Fr & De
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High Frequency Communication and Sensing: Traveling-Wave Techniques introduces novel traveling wave circuit techniques to boost the performance of high-speed circuits in standard low-cost production technologies, like complementary metal oxide semiconductor (CMOS). A valuable resource for experienced analog/radio frequency (RF) circuit designers as well as undergraduate-level microelectronics researchers, this book: Explains the basics of high-speed signaling, such as transmission lines, distributed signaling, impedance matching, and other common practical RF background material Promotes a dual-loop coupled traveling wave oscillator topology, the trigger mode distributed wave oscillator, as a high-frequency multiphase signal source Introduces a force-based starter mechanism for dual-loop, even-symmetry, multiphase traveling wave oscillators, presenting a single-loop version as a force mode distributed wave antenna (FMDWA) Describes higher-frequency, passive inductive, and quarter-wave-length-based pumped distributed wave oscillators (PDWOs) Examines phased-array transceiver architectures and front-end circuits in detail, along with distributed oscillator topologies Devotes a chapter to THz sensing, illustrating a unique method of traveling wave frequency multiplication and power combining Discusses various data converter topologies, such as digital-to-analog converters (DACs), analog-to-digital converters (ADCs), and GHz-bandwidth sigma-delta modulators Covers critical circuits including phase rotators and interpolators, phase shifters, phase-locked loops (PLLs), delay-locked loops (DLLs), and more It is a significantly challenging task to generate and distribute high-speed clocks. Multiphase low-speed clocks with sharp transition are proposed to be a better option to accommodate the desired timing resolution. High Frequency Communication and Sensing: Traveling-Wave Techniques provides new horizons in the quest for greater speed and performance.

Advances in Analog and RF IC Design for Wireless Communication Systems

Advances in Analog and RF IC Design for Wireless Communication Systems
A Book

by Gabriele Manganaro,Domine M W Leenaerts

  • Publisher : Academic Press
  • Release : 2013-05-13
  • Pages : 320
  • ISBN : 0123983320
  • Language : En, Es, Fr & De
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Advances in Analog and RF IC Design for Wireless Communication Systems gives technical introductions to the latest and most significant topics in the area of circuit design of analog/RF ICs for wireless communication systems, emphasizing wireless infrastructure rather than handsets. The book ranges from very high performance circuits for complex wireless infrastructure systems to selected highly integrated systems for handsets and mobile devices. Coverage includes power amplifiers, low-noise amplifiers, modulators, analog-to-digital converters (ADCs) and digital-to-analog converters (DACs), and even single-chip radios. This book offers a quick grasp of emerging research topics in RF integrated circuit design and their potential applications, with brief introductions to key topics followed by references to specialist papers for further reading. All of the chapters, compiled by editors well known in their field, have been authored by renowned experts in the subject. Each includes a complete introduction, followed by the relevant most significant and recent results on the topic at hand. This book gives researchers in industry and universities a quick grasp of the most important developments in analog and RF integrated circuit design. Emerging research topics in RF IC design and its potential application Case studies and practical implementation examples Covers fundamental building blocks of a cellular base station system and satellite infrastructure Insights from the experts on the design and the technology trade-offs, the challenges and open questions they often face References to specialist papers for further reading

Radio Design in Nanometer Technologies

Radio Design in Nanometer Technologies
A Book

by Mohammed Ismail,Delia R. de Llera González

  • Publisher : Springer Science & Business Media
  • Release : 2007-06-16
  • Pages : 316
  • ISBN : 1402048246
  • Language : En, Es, Fr & De
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Radio Design in Nanometer Technologies is the first volume that looks at the integrated radio design problem as a "piece of a big puzzle", namely the entire chipset or single chip that builds an entire wireless system. This is the only way to successfully design radios to meet the stringent demands of today’s increasingly complex wireless systems.

Software Radio

Software Radio
A Modern Approach to Radio Engineering

by Jeffrey Hugh Reed

  • Publisher : Prentice Hall Professional
  • Release : 2002
  • Pages : 567
  • ISBN : 9780130811585
  • Language : En, Es, Fr & De
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This guide to radio engineering covers every technique DSP and RF engineers need to build software radios for a wide variety of wireless systems using DSP techniques. Included are practical guidelines for choosing DSP microprocessors, and systematic, object-oriented software design techniques.

Digital Radio Systems on a Chip

Digital Radio Systems on a Chip
A Systems Approach

by Charles Chien

  • Publisher : Springer Science & Business Media
  • Release : 2001
  • Pages : 533
  • ISBN : 0792372603
  • Language : En, Es, Fr & De
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This book focuses on a specific engineering problem that is and will continue to be important in the forthcoming information age: namely, the need for highly integrated radio systems that can be embedded in wireless devices for various applications, including portable mobile multimedia wireless communications, wireless appliances, digital cellular, and digital cordless. Traditionally, the design of radio ICs involves a team of engineers trained in a wide range of fields that include networking, communication systems, radio propagation, digital/analog circuits, RF circuits, and process technology. However, as radio ICs become more integrated, the need for a diverse skill set and knowledge becomes essential for professionals as well as students, to broaden beyond their trained area of expertise and to become proficient in related areas. The key to designing an optimized, economical solution for radio systems on a chip hinges on the designer's thorough understanding of the complex trade-offs from communication systems down to circuits. The purpose of this book is to provide a focused, top-down treatment of radio system IC design with an emphasis on digital radio systems that will play a dominant role in wireless communications in the 21st century. The intended readers of this book include both engineers as well as students whose main area of interest or line of work lies in the design and integrated circuits implementation of wireless communication ICs, with an emphasis on the integration of an entire radio system on a chip.

Sonography Principles and Instruments - E-Book

Sonography Principles and Instruments - E-Book
A Book

by Frederick W. Kremkau

  • Publisher : Elsevier Health Sciences
  • Release : 2014-03-12
  • Pages : 304
  • ISBN : 0323292518
  • Language : En, Es, Fr & De
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The 8th edition of Kremkau's Sonography Principles and Instruments concisely and comprehensively covers the essential aspects of sonography physics and technology, presenting state-of-the-art content in a dynamic, highly visual format. Confidently prepare for the challenges of practice with a clear understanding of how diagnostic sonography works, including Doppler, artifacts, safety, quality assurance, the latest technology, and more. Essential coverage of physics and ultrasound helps you prepare for the ARDMS SPI exam. Straightforward explanations simplify complex content. Key Points highlight the most important information to help you study more efficiently. Learning features such as chapter outlines, learning objectives, bulleted chapter summaries, and a glossary of sonography physics terms make difficult concepts easier to review and understand. End-of-chapter exercises test your knowledge and understanding with a mix of true-or-false, fill-in-the-blank, multiple choice, and mathematical questions. A mathematics appendix provides fast, efficient access to a List of Symbols, a Compilation of Equations, and a Mathematics Review. A full-color design depicts more than 200 high-quality ultrasound scans similar to what you'll encounter in the clinical setting. Updated scans from the most current equipment and updated content on 3D imaging, contrast, elastrography, and imaging artifacts provide all the information necessary to be consistent with current technology. Full-color photos of common instruments and control panels familiarize you with the devices you'll use in practice. Updated risk and safety statements help you ensure compliance with current national standards. New outline and presentation of materials reflect the 2009 ARDMS Sonography Principles and Instrumentation (SPI) examination.

Radiofrequency Radiation Levels and Population Exposure in Urban Areas of the Eastern United States

Radiofrequency Radiation Levels and Population Exposure in Urban Areas of the Eastern United States
A Book

by Anonim

  • Publisher : Unknown Publisher
  • Release : 1978
  • Pages : 42
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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The Froehlich/Kent Encyclopedia of Telecommunications

The Froehlich/Kent Encyclopedia of Telecommunications
Volume 18 - Wireless Multiple Access Adaptive Communications Technique to Zworykin: Vladimir Kosma

by Fritz E. Froehlich,Allen Kent

  • Publisher : CRC Press
  • Release : 1999-04-27
  • Pages : 500
  • ISBN : 9780824729165
  • Language : En, Es, Fr & De
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"Wireless Multiple Access Adaptive Communications Technique to Zworykin, Vladimir Kosma"

Cognitive Radio, Software Defined Radio, and Adaptive Wireless Systems

Cognitive Radio, Software Defined Radio, and Adaptive Wireless Systems
A Book

by Hüseyin Arslan

  • Publisher : Springer Science & Business Media
  • Release : 2007-08-17
  • Pages : 469
  • ISBN : 1402055420
  • Language : En, Es, Fr & De
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Today’s wireless services have come a long way since the roll out of the conventional voice-centric cellular systems. The demand for wireless access in voice and high rate data multi-media applications has been increasing. New generation wireless communication systems are aimed at accommodating this demand through better resource management and improved transmission technologies. This book discusses the cognitive radio, software defined radio, and adaptive radio concepts from several perspectives.

Radio-Frequency Electronics

Radio-Frequency Electronics
Circuits and Applications

by Jon B. Hagen

  • Publisher : Cambridge University Press
  • Release : 1996-11-13
  • Pages : 358
  • ISBN : 9780521553568
  • Language : En, Es, Fr & De
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This accessible and comprehensive book provides an introduction to the basic concepts and key circuits of radio frequency systems, covering fundamental principles which apply to all radio devices, from wireless data transceivers on semiconductor chips to high-power broadcast transmitters. Topics covered include filters, amplifiers, oscillators, modulators, low-noise amplifiers, phase-locked loops, and transformers. Applications of radio frequency systems are described in such areas as communications, radio and television broadcasting, radar, and radio astronomy. The book contains many exercises, and assumes only a knowledge of elementary electronics and circuit analysis. It will be an ideal textbook for advanced undergraduate and graduate courses in electrical engineering, as well as an invaluable reference for researchers and professional engineers in this area, or for those moving into the field of wireless communications.

Digitally-Assisted Analog and RF CMOS Circuit Design for Software-Defined Radio

Digitally-Assisted Analog and RF CMOS Circuit Design for Software-Defined Radio
A Book

by Kenichi Okada,Shouhei Kousai

  • Publisher : Springer Science & Business Media
  • Release : 2011-08-26
  • Pages : 220
  • ISBN : 9781441985149
  • Language : En, Es, Fr & De
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This book describes the state-of-the-art in RF, analog, and mixed-signal circuit design for Software Defined Radio (SDR). It synthesizes for analog/RF circuit designers the most important general design approaches to take advantage of the most recent CMOS technology, which can integrate millions of transistors, as well as several real examples from the most recent research results.

Microcomputer Interfacing

Microcomputer Interfacing
Principles and Practices

by G. Jack Lipovski

  • Publisher : Free Press
  • Release : 1980
  • Pages : 426
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Digital Front-End in Wireless Communications and Broadcasting

Digital Front-End in Wireless Communications and Broadcasting
Circuits and Signal Processing

by Fa-Long Luo

  • Publisher : Cambridge University Press
  • Release : 2011-09-29
  • Pages : 329
  • ISBN : 1139499017
  • Language : En, Es, Fr & De
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Covering everything from signal processing algorithms to integrated circuit design, this complete guide to digital front-end is invaluable for professional engineers and researchers in the fields of signal processing, wireless communication and circuit design. Showing how theory is translated into practical technology, it covers all the relevant standards and gives readers the ideal design methodology to manage a rapidly increasing range of applications. Step-by-step information for designing practical systems is provided, with a systematic presentation of theory, principles, algorithms, standards and implementation. Design trade-offs are also included, as are practical implementation examples from real-world systems. A broad range of topics is covered, including digital pre-distortion (DPD), digital up-conversion (DUC), digital down-conversion (DDC) and DC-offset calibration. Other important areas discussed are peak-to-average power ratio (PAPR) reduction, crest factor reduction (CFR), pulse-shaping, image rejection, digital mixing, delay/gain/imbalance compensation, error correction, noise-shaping, numerical controlled oscillator (NCO) and various diversity methods.

2020 IEEE International Symposium on Radio Frequency Integration Technology (RFIT)

2020 IEEE International Symposium on Radio Frequency Integration Technology (RFIT)
A Book

by IEEE Staff

  • Publisher : Unknown Publisher
  • Release : 2020-09-02
  • Pages : 329
  • ISBN : 9781728165073
  • Language : En, Es, Fr & De
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RFIT is a focused yet interdisciplinary advanced forum for microwave and microelectronics As an annual event in region 10 solely sponsored by IEEE MTT Society, it rotates among countries in region 10 RFIT provides a forum for the integrated circuit and RF technology communities to meet and present the latest developments in integrated circuit design, technology and system integration, with emphasis on wireless communication systems and emerging applications such as IoT, biomedical and healthcare RFIT will continue to feature both invited and contributed papers Distinguished researchers will be invited to deliver keynote speeches and invited talks on technology trends and significant advances The best papers will be selected from the contributed papers for awards Both invited and contributed papers that are accepted by RFIT will be submitted to IEEE Xplore Extended versions of the papers may be submitted to the IEEE Transactions on Microwave Theory and Techniques