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A Study Of Sar Adc And Implementation Of 10 Bit Asynchronous Design
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Book Synopsis A Study of SAR ADC and Implementation of 10-bit Asynchronous Design by : Olga Kardonik
Download or read book A Study of SAR ADC and Implementation of 10-bit Asynchronous Design written by Olga Kardonik and published by . This book was released on 2013 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Successive Approximation Register (SAR) Analog-to-Digital Converters (ADCs) achieve low power consumption due to its simple architecture based on dominant digital content. SAR ADCs do not require an op-amp, so they are advantageous in CMOS technology scaling. The architecture is often the best choice for battery-powered or mobile applications which need medium resolution (8-12 bits), medium speed (10 - 100 MS/s) and require low-power consumption and small form factor. This work studies the architecture in depth, highlighting its main constraints and tradeoffs involving into SAR ADC design. The work researches asynchronous operation of SAR logic and investigates the latest trends for ADC's analog components - comparator and DAC. 10-bit asynchronous SAR ADC is implemented in CMOS 0.18 μm. Design's noise and power are presented as a breakdown among components.
Book Synopsis Implementation of a 10-bit A-SAR ADC Circuit Based on Voltage to Time Conversion by : Suresh Koyada
Download or read book Implementation of a 10-bit A-SAR ADC Circuit Based on Voltage to Time Conversion written by Suresh Koyada and published by . This book was released on 2016 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comparators are widely used in analog to digital converters. However, the scaling of CMOS technologies makes the design of low power voltage comparators difficult. In order to overcome this problem time-based comparators are introduced which are suitable for nanometer CMOS technology and low supply voltages. This thesis presents the transistor level implementation of a 10-bit time-based accelerated SAR ADC with a supply voltage of 0.5 V. The design increases the conversion speed compared to conventional SAR ADC by updating the upper bound and lower bound of the search space more aggressively. Various design issues, including optimal switch design, glitch minimization at the charge scaling capacitor array output are discussed. This design achieves a SNDR of 58.78dB at a sampling rate of 90.9kS/s and ENOB (effective number of bits) of 9.47 bits with a power consumption of 280nW.
Book Synopsis Investigation of 10-bit SAR ADC Using Flip-flip Bypass Circuit by : Robert Alexander Fontaine
Download or read book Investigation of 10-bit SAR ADC Using Flip-flip Bypass Circuit written by Robert Alexander Fontaine and published by . This book was released on 2013 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Successive Approximation Register (SAR) Analog to Digital Converter (ADC) is power efficient and operates at moderate resolution. However, the conversion speed is limited by settling time and control logic constraints. This report investigates a flip-flop bypass technique to reduce the required conversion time. A conventional design and flip-flop bypass design are simulated using a 0.18[micrometer] CMOS process. Background and design of the control logic, comparator, capacitive array, and switches for implementing the SAR ADCs is presented with the emphasis on optimizing for conversion speed.
Book Synopsis A 10-bit 300-MS/s Asynchronous SAR ADC with Strategy of Optimizing Settling Time for Capacitive DAC in 65 Nm CMOS. by :
Download or read book A 10-bit 300-MS/s Asynchronous SAR ADC with Strategy of Optimizing Settling Time for Capacitive DAC in 65 Nm CMOS. written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fundamental Research in Electrical Engineering by : Shahram Montaser Kouhsari
Download or read book Fundamental Research in Electrical Engineering written by Shahram Montaser Kouhsari and published by Springer. This book was released on 2018-07-25 with total page 1017 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the selected papers of the First International Conference on Fundamental Research in Electrical Engineering, held at Khwarazmi University, Tehran, Iran in July, 2017. The selected papers cover the whole spectrum of the main four fields of Electrical Engineering (Electronic, Telecommunications, Control, and Power Engineering).
Book Synopsis A Low-power, Low-area 10-bit SAR ADC with Length-based Capacitive DAC by : Zhili Pan
Download or read book A Low-power, Low-area 10-bit SAR ADC with Length-based Capacitive DAC written by Zhili Pan and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 2.5 V single-ended 10-bit successive-approximation-register analog-to-digital converter (SAR ADC) based on the TSMC 65 nm CMOS process is designed with the goal of achieving low power consumption (33.63 pJ/sample) and small area (2874 μm2 ). It utilizes a novel length-based capacitive digital-to-analog converter (CDAC) layout to achieve low total capacitance for power efficiency, and a custom static asynchronous logic to free the dependence on a high-frequency external clock source. Two test chips have been designed and the problems found through testing the first chip are analyzed. Multiple improved versions of the ADC with minor variations are implemented on the second test chip for performance evaluation, and the test method is explained.
Book Synopsis Design and Implementation of Radix-3/Radix-2 Based Novel Hybrid SAR ADC in Scaled CMOS Technologies by : Md. Manzur Rahman
Download or read book Design and Implementation of Radix-3/Radix-2 Based Novel Hybrid SAR ADC in Scaled CMOS Technologies written by Md. Manzur Rahman and published by . This book was released on 2017 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on low power and high speed design techniques for successive approximation register (SAR) analog-to-digital converters (ADCs) in nanoscale CMOS technologies. SAR ADCs’ speed is limited by the number of bits of resolution. An N-bit conventional SAR ADC takes N conversion cycles. To speed up the conversion process, we introduce a radix-3 SAR ADC which can compute 1:6 bits per cycle. To our knowledge, it is the first fully programmable and efficiently hardware controlled radix-3 SAR ADC. We had to use two comparators per cycle due to ADC architecture and we proposed a simple calibration scheme for the comparators. Also, as the architecture of the DAC array is completely different from the architecture of conventional radix-2 SAR ADC’s DAC arrays, we came up with an algorithm for calibration of capacitors of the DAC. Low power SAR ADCs face two major challenges especially at high resolutions: (1) increased comparator power to suppress the noise, and (2) increased DAC switching energy due to the large DAC size. Due to our proposed architecture,the radix-3 SAR ADC uses two comparators per cycle and two differential DACs. To improve the comparator’s power efficiency, an efficient and low cost calibration technique has been introduced. It allows a low power and noisy comparator to achieve high signal-to-noise ratio (SNR). To improve the DAC switching energy, we introduced a radix-3/radix-2 based novel hybrid SAR ADC. We use two single ended DACs for radix-3 SAR ADC and these two single ended DACs can be used as one differential DAC for radix-2 SAR ADC. So, overall, we only have a single DAC as conventional radix- 2 SAR ADC. In addition, a monotonic switching technique is adopted for radix-2 search to reduce the DAC capacitor size and hence, to reduce switching power. It can reduce the total number of unit capacitors by four times. Our proposed hybrid SAR ADC can achieve less DAC energy compared to radix-3 and radix-2 SAR ADCs. Also, to utilize technology scaling, we used the minimum capacitor size allowed by thermal noise limitations. To achieve high resolution, we introduced calibration algorithm for the DAC array. As mentioned earlier, the radix-3 SAR ADC offers higher power than conventional radix-2 SAR ADC because of simultaneous use of two comparators. In the proposed hybrid SAR ADC, we will be using radix-3 search for first few MSB bits. So, the resolution required for radix-3 comparators are much larger than the LSB value of 10-bit ADC. By implementing calibration of comparators, we can use low power, high input referred offset and high speed comparators for radix-3 search. Radix-2 search will be used for rest of the bits and the resolution of the radix-2 comparator has to be less than the required LSB value. So, a high power, low input referred offset and high speed comparator is used for radix-2 search. Also, we introduced clock gating for comparators. So, radix-3 comparators will not toggle during radix-2 search and the radix-2 comparators will be inactive during radix-3 search. By using the aforementioned techniques, the overall comparator power is definitely less than a radix-3 SAR ADC and comparable to a conventional radix-2 SAR ADC. A prototype radix-3/radix-2 based hybrid SAR ADC with the proposed technique is designed and fabricated in 40nm CMOS technology. It achieves an SNDR of 56.9 dB and consumes only 0.38 mW power at 30MS/s, leading to a Walden figure of merit of 21.5 fJ/conv-step.
Book Synopsis 10-bit 200-ms/s SAR ADC with Dual-loop Asynchronous Control in 90nm CMOS. by : 許力元
Download or read book 10-bit 200-ms/s SAR ADC with Dual-loop Asynchronous Control in 90nm CMOS. written by 許力元 and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Principles of Data Conversion System Design by : Behzad Razavi
Download or read book Principles of Data Conversion System Design written by Behzad Razavi and published by Wiley-IEEE Press. This book was released on 1995 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: This advanced text and reference covers the design and implementation of integrated circuits for analog-to-digital and digital-to-analog conversion. It begins with basic concepts and systematically leads the reader to advanced topics, describing design issues and techniques at both circuit and system level. Gain a system-level perspective of data conversion units and their trade-offs with this state-of-the art book. Topics covered include: sampling circuits and architectures, D/A and A/D architectures; comparator and op amp design; calibration techniques; testing and characterization; and more!
Book Synopsis Charge-Sharing SAR ADCs for Low-Voltage Low-Power Applications by : Taimur Rabuske
Download or read book Charge-Sharing SAR ADCs for Low-Voltage Low-Power Applications written by Taimur Rabuske and published by Springer. This book was released on 2016-08-02 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces readers to the potential of charge-sharing (CS) successive approximation register (SAR) analog-to-digital converters (ADCs), while providing extensive analysis of the factors that limit the performance of the CS topology. The authors present guidelines and useful techniques for mitigating the limitations of the architecture, while focusing on the implementation under restricted power budgets and voltage supplies.
Book Synopsis Low-Power High-Speed ADCs for Nanometer CMOS Integration by : Zhiheng Cao
Download or read book Low-Power High-Speed ADCs for Nanometer CMOS Integration written by Zhiheng Cao and published by Springer Science & Business Media. This book was released on 2008-07-15 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low-Power High-Speed ADCs for Nanometer CMOS Integration is about the design and implementation of ADC in nanometer CMOS processes that achieve lower power consumption for a given speed and resolution than previous designs, through architectural and circuit innovations that take advantage of unique features of nanometer CMOS processes. A phase lock loop (PLL) clock multiplier has also been designed using new circuit techniques and successfully tested. 1) A 1.2V, 52mW, 210MS/s 10-bit two-step ADC in 130nm CMOS occupying 0.38mm2. Using offset canceling comparators and capacitor networks implemented with small value interconnect capacitors to replace resistor ladder/multiplexer in conventional sub-ranging ADCs, it achieves 74dB SFDR for 10MHz and 71dB SFDR for 100MHz input. 2) A 32mW, 1.25GS/s 6-bit ADC with 2.5GHz internal clock in 130nm CMOS. A new type of architecture that combines flash and SAR enables the lowest power consumption, 6-bit >1GS/s ADC reported to date. This design can be a drop-in replacement for existing flash ADCs since it does require any post-processing or calibration step and has the same latency as flash. 3) A 0.4ps-rms-jitter (integrated from 3kHz to 300MHz offset for >2.5GHz) 1-3GHz tunable, phase-noise programmable clock-multiplier PLL for generating sampling clock to the SAR ADC. A new loop filter structure enables phase error preamplification to lower PLL in-band noise without increasing loop filter capacitor size.
Book Synopsis Noise Shaping Asynchronous SAR ADC Based Time to Digital Converter by : Sowmya Katragadda
Download or read book Noise Shaping Asynchronous SAR ADC Based Time to Digital Converter written by Sowmya Katragadda and published by . This book was released on 2016 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-to-digital converters (TDCs) are key elements for the digitization of timing information in modern mixed-signal circuits such as digital PLLs, DLLs, ADCs, and on-chip jitter-monitoring circuits. Especially, high-resolution TDCs are increasingly employed in on-chip timing tests, such as jitter and clock skew measurements, as advanced fabrication technologies allow fine on-chip time resolutions. Its main purpose is to quantize the time interval of a pulse signal or the time interval between the rising edges of two clock signals. Similarly to ADCs, the performance of TDCs are also primarily characterized by Resolution, Sampling Rate, FOM, SNDR, Dynamic Range and DNL/INL. This work proposes and demonstrates 2nd order noise shaping Asynchronous SAR ADC based TDC architecture with highest resolution of 0.25 ps among current state of art designs with respect to post-layout simulation results. This circuit is a combination of low power/High Resolution 2nd Order Noise Shaped Asynchronous SAR ADC backend with simple Time to Amplitude converter (TAC) front-end and is implemented in 40nm CMOS technology. Additionally, special emphasis is given on the discussion on various current state of art TDC architectures.
Author :Arthur H.M. van Roermund Publisher :Springer Science & Business Media ISBN 13 :1461445876 Total Pages :291 pages Book Rating :4.4/5 (614 download)
Book Synopsis Nyquist AD Converters, Sensor Interfaces, and Robustness by : Arthur H.M. van Roermund
Download or read book Nyquist AD Converters, Sensor Interfaces, and Robustness written by Arthur H.M. van Roermund and published by Springer Science & Business Media. This book was released on 2012-11-26 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is based on the 18 presentations during the 21st workshop on Advances in Analog Circuit Design. Expert designers provide readers with information about a variety of topics at the frontier of analog circuit design, including Nyquist analog-to-digital converters, capacitive sensor interfaces, reliability, variability, and connectivity. This book serves as a valuable reference to the state-of-the-art, for anyone involved in analog circuit research and development.
Book Synopsis A New High-Speed ADC Architecture by : Matias Jara
Download or read book A New High-Speed ADC Architecture written by Matias Jara and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-speed low-power analog-to-digital converters (ADCs) find application in communication systems and signal processing. The principal challenge in developing such ADCs stems from speed-power-resolution trade-offs. An attractive low-power solution is the successive approximation (SAR) architecture, but it suffers from a low conversion speed. This work introduces a SAR ADC that incorporates a number of novel techniques to push the speed without sacrificing power. A "look-ahead" architecture is presented that doubles the speed, as well as a new SAR logic circuit. In addition, a new method of clock generation and distribution for time-interleaved ADCs is demonstrated that lowers phase mismatches considerably. Realized in 28-nm CMOS technology, a 6-bit 10-GS/s prototype provides a signal-to-(noise+distortion) ratio of 31.2 dB at Nyquist, while drawing 17.6 mW. This results in a figure of merit of 59 fJ/cs, the lowest achieved to date
Book Synopsis Adiabatic Charging in SAR ADCs by : Aleksandr Gusev
Download or read book Adiabatic Charging in SAR ADCs written by Aleksandr Gusev and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Successive Approximation Register (SAR) is an established and well-rounded (Analog-to-Digital Converter) ADC architecture allowing for medium resolution and medium conversion speed while being energy efficient and relatively small in area. Switched-capacitor (Digital-to-Analog Converter) DAC being an essential component of the SAR architecture in certain design configurations might contribute significantly to the overall ADC power consumption. Adiabatic capacitor charging is a method that allows for increasing the charging efficiency using linear voltage or constant current to charge a capacitor. A variation of this approach uses a series of small voltage steps instead of a voltage ramp, which is particularly suitable for switched-capacitor circuits as it does not require analog circuitry such as a voltage ramp generator or a current source. This work investigates the stepwise capacitor charging approach applied to DAC in SAR ADC in terms of the architectural modifications and their influence on the resulting efficiency improvement. The study begins with an estimation of the stepwise charging applied to a conventional DAC switching scheme. The average energy consumption is derived as a function of the number of charging steps and resolution, the results are verified in MATLAB. For the implementation of the approach, other switching schemes were considered, the selected monotonic switching scheme was then also modelled in MATLAB to evaluate the efficiency improvement depending on the number of charging steps in that case. Stepwise charging requires several intermediate voltage levels in addition to the regular reference voltage. The work includes the discussion and implementation of the onboard DC-DC converter and the MATLAB model includes its influence on energy savings, allowing for a design optimization as well as the selection of the converter's configuration in regards to the number of charging steps, resolution, and DAC unit capacitor size. Finally, the work describes a fabricated IC with two proof-of-concept ADC prototypes featuring 4-step charging applied to a 10-bit monotonic SAR ADC. The circuits differ in terms of the DAC capacitance and conversion speed. The first prototype has a sampling rate of 165 kS/s and achieves SNDR of 57.63 dB. The second prototype has a sampling rate of 1 MS/s and achieves SNDR of 56.52 dB. The architecture is designed with separated circuits for the SAR register and adiabatic charging control logic in order to better differentiate the control logic penalty related to stepwise charging. To further identify the power savings in both prototypes, the 1-step versions of each prototype with adiabatic circuitry removed from the layout are simulated in CAD and compared to the 4-step counterparts. The evaluation of the first prototype shows a 26% reduction of the DAC power consumption including all the extra circuitry, whereas the second prototype establishes the limitation of the approach where the energy savings were overpowered by the control logic penalty and DC-DC converter switching losses. The work discusses this limitation in detail describing the applicability area of adiabatic charging. The proposed method allows the inclusion of these types of losses to optimize the configuration and estimate the benefits of the adiabatic switching in each case.
Book Synopsis Data Converters by : Franco Maloberti
Download or read book Data Converters written by Franco Maloberti and published by Springer Science & Business Media. This book was released on 2007-02-22 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first graduate-level textbook presenting a comprehensive treatment of Data Converters. The advancement of digital electronics urged the availability of a still missing support for teaching and self-learning analog-digital interfaces at many levels: the specification, the conversion methods and architectures, the circuit design and the testing. This book, after the necessary study of the background theoretical elements, covers aspects and provide elements for a deep and comprehensive knowledge. The breath and the level of details of topics is enhanced by introductory material in each chapter and the use of many examples, most of them in the form of computer behavioral simulations. The examples and the end-of-chapter problems help in understanding and favor self-practice using tools that are effective for training and for design activity. Data Converters is a textbook that is also essential for engineering professionals as it was written for responding to a shortage of organically organized material on the topic. The book assumes a solid background in analog and digital circuits as well as a working knowledge of simulation tools for circuit and behavioral analysis. A background on statistical analysis is also helpful, though not strictly necessary. Coverage of all the basic elements essential for a clear understanding of sampling, quantization, noise in sampled-data systems and mathematical tools for sampled-data linear systems Comprehensive definition of the parameters used to specify data converters and necessary for understanding product data sheets Coverage of all the architectures used in Nyquist-rate data converters and detailed study of features, limits and design techniques Detailed study of oversampled and Sigma-Delta converters with simulation examples and use of spectra and histograms for a clear understanding of features and limit if the noise shaping Coverage of digital correction and calibration techniques for enhancing performances Use of theory and intuitive views to explain circuits and systems operation and limits Coverage of testing methods and description of the data processing used for testing and characterization Extensive use of Simulink and Matlab in examples and problem sets to assist reader comprehension and favor deeper study
Book Synopsis Inverter-Based Circuit Design Techniques for Low Supply Voltages by : Rakesh Kumar Palani
Download or read book Inverter-Based Circuit Design Techniques for Low Supply Voltages written by Rakesh Kumar Palani and published by Springer. This book was released on 2016-10-14 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes intuitive analog design approaches using digital inverters, providing filter architectures and circuit techniques enabling high performance analog circuit design. The authors provide process, supply voltage and temperature (PVT) variation-tolerant design techniques for inverter based circuits. They also discuss various analog design techniques for lower technology nodes and lower power supply, which can be used for designing high performance systems-on-chip.
