High Speed Analog To Digital Converters For Broadband Applications
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High Speed Analog To Digital Converters For Broadband Applications
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Author : Ayman H. Ismail
language : en
Publisher:
Release Date : 2007
High Speed Analog To Digital Converters For Broadband Applications written by Ayman H. Ismail and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Flash Analog-to-Digital Converters (ADCs), targeting optical communication standards, have been reported in SiGe BiCMOS technology. CMOS implementation of such designs faces two challenges. The first is to achieve a high sampling speed, given the lower gain-bandwidth (lower ft) of CMOS technology. The second challenge is to handle the wide bandwidth of the input signal with a certain accuracy. Although the first problem can be relaxed by using the time-interleaved architecture, the second problem remains as a main obstacle to CMOS implementation. As a result, the feasibility of the CMOS implementation of ADCs for such applications, or other wide band applications, depends primarily on achieving a very small input capacitance (large bandwidth) at the desired accuracy. In the flash architecture, the input capacitance is traded off for the achievable accuracy. This tradeoff becomes tighter with technology scaling. An effective way to ease this tradeoff is to use resistive offset averaging. This permits the use of smaller area transistors, leading to a reduction in the ADC input capacitance. In addition, interpolation can be used to decrease the input capacitance of flash ADCs. In an interpolating architecture, the number of ADC input preamplifiers is reduced significantly, and a resistor network interpolates the missing zero-crossings needed for an N-bit conversion. The resistive network also averages out the preamplifiers offsets. Consequently, an interpolating network works also as an averaging network. The resistor network used for averaging or interpolation causes a systematic non-linearity at the ADC transfer characteristics edges. The common solution to this problem is to extend the preamplifiers array beyond the input signal voltage range by using dummy preamplifiers. However, this demands a corresponding extension of the flash ADC reference-voltage resistor ladder. Since the voltage headroom of the reference ladder is considered to be a main bottleneck in the implementation of flash ADCs in deep-submicron technologies with reduced supply voltage, extending the reference voltage beyond the input voltage range is highly undesirable. The principal objective of this thesis is to develop a new circuit technique to enhance the bandwidth-accuracy product of flash ADCs. Thus, first, a rigorous analysis of flash ADC architectures accuracy-bandwidth tradeoff is presented.
Power Efficient High Speed Parallel Sampling Adcs For Broadband Multi Carrier Systems
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Author : Yu Lin
language : en
Publisher: Springer
Release Date : 2015-05-07
Power Efficient High Speed Parallel Sampling Adcs For Broadband Multi Carrier Systems written by Yu Lin and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-05-07 with Technology & Engineering categories.
This book addresses the challenges of designing high performance analog-to-digital converters (ADCs) based on the “smart data converters” concept, which implies context awareness, on-chip intelligence and adaptation. Readers will learn to exploit various information either a-priori or a-posteriori (obtained from devices, signals, applications or the ambient situations, etc.) for circuit and architecture optimization during the design phase or adaptation during operation, to enhance data converters performance, flexibility, robustness and power-efficiency. The authors focus on exploiting the a-priori knowledge of the system/application to develop enhancement techniques for ADCs, with particular emphasis on improving the power efficiency of high-speed and high-resolution ADCs for broadband multi-carrier systems.
Delta Sigma Data Converters For Broadband Digital Communications
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Author : Anas A. Hamoui
language : en
Publisher:
Release Date : 2004
Delta Sigma Data Converters For Broadband Digital Communications written by Anas A. Hamoui and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Accordingly, to meet the stringent ADC specifications imposed by emerging broadband communication applications, this thesis explores the following: (1) High-Speed High-Resolution Delta-Sigma (DeltaSigma) ADCs: Oversampling DeltaSigma ADCs can achieve a high-resolution data conversion in low-speed applications using low-accuracy analog components. However, extending these ADCs to high-speed applications requires lowering the oversampling ratio (OSR), due to both power and CMOS technology limitations. Unfortunately, this significantly limits the efficiency of a DeltaSigma ADC in achieving a high-resolution analog/digital (A/D) conversion. Therefore, this thesis presents several techniques to enable the OSR lowering in high-speed DeltaSigma ADCs without compromising the resolution. Specifically, a low-distortion single-stage architecture is proposed for high-order multibit DeltaSigma modulators. Furthermore, a dynamic-element-matching (DEM) technique, called Pseudo Data-Weighted-Averaging (Pseudo DWA), with reduced tone behavior at a low OSR is proposed for the linearization of the digital-to-analog converter (DAC) in a multibit DeltaSigma modulator. (2) Low-Voltage Switched-Capacitor (SC) Circuit Implementation: To demonstrate the practicality of the proposed modulator architecture and DAC-linearization technique when the OSR and the supply voltage are limited by the technology, a DeltaSigma modulator prototype is designed using SC circuit techniques and fabricated in a 0.18-mum standard digital CMOS process. When operated from a 1.8-V supply, it achieves a 13-bit spurious-free dynamic range (SFDR) and a 12-bit signal-to-noise ratio (SNR) over a 3-MS/s conversion bandwidth with a 1.85-V pp input-signal range. The analog and digital power consumptions are, respectively, 32.4 mW and 12.6 mW. The on-chip references dissipate 14.4 mW. Accordingly, this DeltaSigma modulator was one of the few early-reported CMOS DeltaSigma modulators targeting high-speed (& ge;2 MS/s) high-resolution (& ge;12 bits) applications and operating from a low supply voltage (& le;1.8 V). Furthermore, its measured performance compared favourably to the previously-reported state-of-the-art DeltaSigma modulators. Ironically, the significance of analog integrated-circuit design is growing more prominent in today's "digital" communication age due, in part, to data converters. Specifically, the proliferation of broadband digital communication applications is stimulating the evolving research towards the development of analog-to-digital converters (ADCs) with higher speeds and higher resolutions. These ADCs must be implemented in standard digital CMOS processes for higher system integration and lower fabrication costs. However, in nano-scale CMOS technologies, the decreasing supply voltages and the shrinking devices with poor analog-processing capabilities complicate the low-power design of high-resolution analog circuits.
Photonic Analog To Digital Conversion
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Author : Barry L. Shoop
language : en
Publisher: Springer
Release Date : 2012-11-02
Photonic Analog To Digital Conversion written by Barry L. Shoop and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-11-02 with Technology & Engineering categories.
Provides a comprehensive look at the application of photonic approaches to the problem of analog-to-digital conversion. It looks into the progress made to date, discusses present research, and presents a glimpse of potential future technologies.
High Speed Analog To Digital Conversion
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Author : Michael J. Demler
language : en
Publisher: Elsevier
Release Date : 2012-12-02
High Speed Analog To Digital Conversion written by Michael J. Demler and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-02 with Technology & Engineering categories.
This book covers the theory and applications of high-speed analog-to-digital conversion. An analog-to-digital converter takes real-world inputs (such as visual images, temperature readings, and rates of speed) and transforms them into digital form for processing by computer. This book discusses the design and uses of such circuits, with particular emphasis on improving the speed of the conversion process and the accuracy of its output--how well the output is a corresponding digital representation of the output*b1input signal. As computers become increasingly interfaced to the outside world, "ADC" techniques will become ever more important.
High Speed And Low Power Techniques For Successive Approximation Register Analog To Digital Converters
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Author : Eric Lee Swindlehurst
language : en
Publisher:
Release Date : 2020
High Speed And Low Power Techniques For Successive Approximation Register Analog To Digital Converters written by Eric Lee Swindlehurst and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Broadband wireless communication systems demand power-efficient analog-to-digital converters (ADCs) in the GHz and medium resolution regime. While high-speed architectures such as the flash and pipelined ADCs are capable of GHz operations, their high-power consumption reduces their attractiveness for mobile applications. On the other hand, the successive-approximation-register (SAR) ADC has an excellent power efficiency, but its slow speed has traditionally limited it to MHz applications. This dissertation puts forth several novel techniques to significantly increase the speed and power efficiency of the SAR architecture and demonstrates them in a low-power 10-GHz SAR ADC suitable for broadband wireless communications.
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Author :
language : en
Publisher:
Release Date : 1970
written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with categories.
Introduction To Analog To Digital Converters
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Author : Takao Waho
language : en
Publisher: CRC Press
Release Date : 2022-09-01
Introduction To Analog To Digital Converters written by Takao Waho and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-09-01 with Science categories.
Analog-to-digital (A/D) and digital-to-analog (D/A) converters, or data converters in short, play a critical role as interfaces between the real analog world and digital equipment. They are now indispensable in the field of sensor networks, internet of things (IoT), robots, and automatic driving vehicles, as well as high-precision instrumentation and wideband communication systems. As the world increasingly relies on digital information processing, the importance of data converters continues to increase.The primary purpose of this book is to explain the fundamentals of data converters for students and engineers involved in this fascinating field as a newcomer. The book will also help students who have learned the basics of analog circuit design to understand the state-of-the-art data converters. It is desirable for readers to be familiar with basic analog IC design and digital signal processing using z-transform.
Delta Sigma A D Converters
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Author : Richard Gaggl
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-17
Delta Sigma A D Converters written by Richard Gaggl and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-17 with Technology & Engineering categories.
The emphasis of this book is on practical design aspects for broadband A/D converters for communication systems. The embedded designs are employed for transceivers in the field of ADSL solutions and WLAN applications. An area- and power-efficient realization of a converter is mandatory to remain competitive in the market. The right choice for the converter topology and architecture needs to be done very carefully to result in a competitive FOM. The book begins with a brief overview of basic concepts about ADSL and WLAN to understand the ADC requirements. At architectural level, issues on different modulator topologies are discussed employing the provided technology node. The design issues are pointed out in detail for modern digital CMOS technologies, beginning with 180nm followed by 130nm and going down to 65nm feature size. Beside practical aspects, challenges to mixed-signal design level are addressed to optimize the converters in terms of consumed chip area, power consumption and design for high yield in volume production. Thus, careful considerations on circuit- and architectural- level are performed by introducing a dynamic-biasing technique, a feed-forward approach and a resolution in time instead of amplitude resolution.
Offset Reduction Techniques In High Speed Analog To Digital Converters
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Author : Pedro M. Figueiredo
language : en
Publisher: Springer Science & Business Media
Release Date : 2009-03-10
Offset Reduction Techniques In High Speed Analog To Digital Converters written by Pedro M. Figueiredo and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-03-10 with Technology & Engineering categories.
Offset Reduction Techniques in High-Speed Analog-to-Digital Converters analyzes, describes the design, and presents test results of Analog-to-Digital Converters (ADCs) employing the three main high-speed architectures: flash, two-step flash and folding and interpolation. The advantages and limitations of each one are reviewed, and the techniques employed to improve their performance are discussed.