Design Techniques for Enhancing Power Efficiency of Delta-Sigma Modulators and Performance of Switched-Capacitor Circuits PDF Download
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Author:
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ISBN:
Category :
Languages : en
Pages : 181
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 181
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Book Description
Author: Jorge Grilo
Publisher:
ISBN:
Category : Low voltage systems
Languages : en
Pages : 388
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Book Description
This dissertation investigates the constraints which arise when switched-capacitor (SC) delta-sigma modulators are designed for low-voltage operation, targeting also low power dissipation, and proposes methods of improving the performance and optimizing for low power dissipation. This is accomplished by identifying critical elements whose performance can lead to increased power dissipation, as well as the fundamental limitations of available analog circuit techniques. A prototype was designed and fabricated, which reflected these findings, and therefore exhibited good performance and nearly optimum power dissipation. One of the key performance parameters is the dc gain of the amplifier in the first stage; it should be high. This is necessary for high linearity and low quantization noise leakage. In low-voltage operation, it may become impractical to use conventional topologies employing cascoding techniques (e.g., folded-cascode) which provide high gain in one single stage. Rather, cascaded structures have to be used. The disadvantage of the latter is the necessity for frequency compensation which results in increased power dissipation. Hence, another objective of this work is to exploit techniques which compensate for the open-loop gain characteristic of the amplifier (dc gain and nonlinearity), thus permitting the utilization of single-stage low-gain topologies. Predictive correlated double sampling is one of such techniques and is analyzed in detail.
Author: Shahriar Rabii
Publisher: Springer Science & Business Media
ISBN: 1461551056
Category : Technology & Engineering
Languages : en
Pages : 198
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Book Description
Oversampling techniques based on sigma-delta modulation are widely used to implement the analog/digital interfaces in CMOS VLSI technologies. This approach is relatively insensitive to imperfections in the manufacturing process and offers numerous advantages for the realization of high-resolution analog-to-digital (A/D) converters in the low-voltage environment that is increasingly demanded by advanced VLSI technologies and by portable electronic systems. In The Design of Low-Voltage, Low-Power Sigma-Delta Modulators, an analysis of power dissipation in sigma-delta modulators is presented, and a low-voltage implementation of a digital-audio performance A/D converter based on the results of this analysis is described. Although significant power savings can typically be achieved in digital circuits by reducing the power supply voltage, the power dissipation in analog circuits actually tends to increase with decreasing supply voltages. Oversampling architectures are a potentially power-efficient means of implementing high-resolution A/D converters because they reduce the number and complexity of the analog circuits in comparison with Nyquist-rate converters. In fact, it is shown that the power dissipation of a sigma-delta modulator can approach that of a single integrator with the resolution and bandwidth required for a given application. In this research the influence of various parameters on the power dissipation of the modulator has been evaluated and strategies for the design of a power-efficient implementation have been identified. The Design of Low-Voltage, Low-Power Sigma-Delta Modulators begins with an overview of A/D conversion, emphasizing sigma-delta modulators. It includes a detailed analysis of noise in sigma-delta modulators, analyzes power dissipation in integrator circuits, and addresses practical issues in the circuit design and testing of a high-resolution modulator. The Design of Low-Voltage, Low-Power Sigma-Delta Modulators will be of interest to practicing engineers and researchers in the areas of mixed-signal and analog integrated circuit design.
Author: Mingliang (Michael) Liu
Publisher: Elsevier
ISBN: 0080458769
Category : Technology & Engineering
Languages : en
Pages : 332
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Book Description
This book helps engineers to grasp fundamental theories and design principles by presenting physical and intuitive explanations of switched-capacitor circuits. Numerous circuit examples are discussed and the author emphasizes the most important and fundamental principles involved in implementing state-of-the-art switched-capacitor circuits for analog signal processing and power management applications. Throughout the book, the author presents numerous step-by-step tutorials and gives practical design examples.While some quantitative analysis is necessary to understand underlying concepts, tedious mathematical equations and formal proofs are avoided. An intuitive appreciation for switched-capacitor circuits is achieved.Much of the existing information on contemporary switched-capacitor circuit applications is in the form of applications notes and data sheets for various switched-capacitor ICs. This book compiles such information in a single volume and coherently organizes and structures it.The author has his own website at www.mingliangliu.com * Step-by-step tutorials which emphasize the most fundamental principals of switched-capacitor circuits * Few tedious mathematical equations * The first easy-to-understand compilation on this subject--most information available is not very cohesive
Author: Xin Meng
Publisher:
ISBN:
Category : Analog-to-digital converters
Languages : en
Pages : 79
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Book Description
Low-distortion architecture is widely used in wideband discrete-time switched-capacitor delta-sigma ADC design. However, it suffers from the power-hungry active adder and critical timing for quantization and dynamic element matching (DEM). To solve this problem, this dissertation presents a delta-sigma modulator architecture with shifted loop delays. In this project, shifted loop delays (SLD) technique can relax the speed requirements of the quantizer and the dynamic element matching (DEM) block, and eliminate the active adder. An implemented 0.18 um CMOS prototype with the proposed architecture provided 81.6 dB SNDR, 81.8 dB dynamic range, and -95.6 dB THD in a signal bandwidth of 4 MHz. It dissipates 19.2 mW with a 1.6 V power supply. The conventional low-distortion ADC was also implemented on the same chip for comparison. The new circuit has superior performance, and dissipates 25% less power (19.2 mW vs. 24.9 mW) than the conventional one. The figure-of-merit for the ADC with SLD is among the best reported for wideband discrete-time ADCs, and is almost 40% better than that of the conventional ADC. The second project describes two techniques to enhance the noise shaping function in the proposed low-distortion [delta sigma] modulator with shifted loop delays. One is self-noise coupling based on low-distortion [delta sigma] structure; the other is noise-coupled time-interleaved [delta sigma] modulator. Both architectures use shifted loop delays to relax the critical timing constraints in the modulator feedback path, then to save power consumption of each block in the modulators. Two [delta sigma] ADCs were analyzed and simulated in a 0.18 um CMOS technology. The simulation results highly verify the effectiveness of the proposed structure. The third system describes the design technique for double-sampled wideband [delta sigma] ADCs with shifted loop delays (SLD). The added loop delay in the feedback branch relaxes the critical timing for DEM logic. Delay shifting can be combined with such useful techniques as low-distortion circuitry and noise coupling for wideband [delta sigma] modulators. The presented techniques relax the timing for inherent quantization delay, reduce the speed requirements for the critical circuit blocks, and achieve power efficiency by replacing the power-hungry blocks normally used in the modulators. Analysis of all architectures allows the choice of the most power-efficient topology for a wideband [delta sigma] modulator. The proposed second-order and third-order [delta sigma] modulators were designed and simulated to verify the effectiveness of the shifted loop delays techniques.
Author: David Fouto
Publisher: Springer
ISBN: 3319570331
Category : Technology & Engineering
Languages : en
Pages : 85
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Book Description
This book presents the study, design, modulation, optimization and implementation of low power, passive DT-ΣΔMs for use in audio applications. The high gain and bandwidth amplifier normally used for integration in ΣΔ modulation, is replaced by passive, switched-capacitor branches working under the Ultra Incomplete Settling (UIS) condition, leading to a reduction of the consumed power. The authors describe a design process that uses high level models and an optimization process based in genetic algorithms to achieve the desired performance.
Author: Fernando Medeiro
Publisher: Springer Science & Business Media
ISBN: 1475730039
Category : Technology & Engineering
Languages : en
Pages : 303
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Book Description
The interest for :I:~ modulation-based NO converters has significantly increased in the last years. The reason for that is twofold. On the one hand, unlike other converters that need accurate building blocks to obtain high res olution, :I:~ converters show low sensitivity to the imperfections of their building blocks. This is achieved through extensive use of digital signal pro cessing - a desirable feature regarding the implementation of NO interfaces in mainstream CMOS technologies which are better suited for implementing fast, dense, digital circuits than accurate analog circuits. On the other hand, the number of applications with industrial interest has also grown. In fact, starting from the earliest in the audio band, today we can find :I:~ converters in a large variety of NO interfaces, ranging from instrumentation to commu nications. These advances have been supported by a number of research works that have lead to a considerably large amount of published papers and books cov ering different sub-topics: from purely theoretical aspects to architecture and circuit optimization. However, so much material is often difficultly digested by those unexperienced designers who have been committed to developing a :I:~ converter, mainly because there is a lack of methodology. In our view, a clear methodology is necessary in :I:~ modulator design because all related tasks are rather hard.
Author: Qiyuan Liu
Publisher: Springer
ISBN: 3319772252
Category : Technology & Engineering
Languages : en
Pages : 215
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Book Description
This book describes a circuit architecture for converting real analog signals into a digital format, suitable for digital signal processors. This architecture, referred to as multi-stage noise-shaping (MASH) Continuous-Time Sigma-Delta Modulators (CT-ΔΣM), has the potential to provide better digital data quality and achieve better data rate conversion with lower power consumption. The authors not only cover MASH continuous-time sigma delta modulator fundamentals, but also provide a literature review that will allow students, professors, and professionals to catch up on the latest developments in related technology.
Author: Patrick J. Quinn
Publisher: Springer Science & Business Media
ISBN: 1402062583
Category : Technology & Engineering
Languages : en
Pages : 261
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Book Description
This book proposes alternative switched capacitor techniques which allow the achievement of higher intrinsic analogue functional accuracy than previously possible in such application areas as analogue filter and ADC design. The validity of the concepts developed and analyzed in Switched-Capacitor Techniques for High-Accuracy Filter and ADC Design has been demonstrated in practice with the design of CMOS SC bandpass filters and algorithmic ADC stages.
Author: Nianxiong Tan
Publisher: Springer Science & Business Media
ISBN: 1461562074
Category : Technology & Engineering
Languages : en
Pages : 238
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Book Description
Switched-Current Design and Implementation of Oversampling A/D Converters discusses the switched-current (SI) technique and its application in oversampling A/D converters design. The SI technique is an analog sampled-data technique that fully exploits the digital CMOS process. Compared with the traditional switched-capacitor (SC) technique, the SI technique has both pros and cons that are highlighted in the book. With the consideration of similarity and difference of SI and SC techniques, oversampling A/D converter architectures are tailored and optimized for SI design and implementation in the book. Switched-Current Design and Implementation of Oversampling A/D Converters emphasizes the practical aspects of SI circuits without tedious mathematical derivations, and is full of circuit design and implementation examples. There are more than 10 different chips included in the book, demonstrating the high-speed (over 100 MHz) and ultra-low-voltage (1.2 V) operation of SI circuits and systems in standard digital CMOS processes. Therefore, the book is of special value as a practical guide for designing SI circuits and SI oversampling A/D converters. Switched-Current Design and Implementation of Oversampling A/D Converters serves as an excellent reference for analog designers, especially A/D converter designers, and is of interest to digital designers for real-time signal processing who need A/D interfaces. The book may also be used as a text for advanced courses on the subject.
