Index Catalog // ScholarsArchive@OSU

High-performance Ring Amplifier based Analog-to-Digital Converters

Creator:: Hu, Hang
Abstract:: Ring Amplifier serves as a great candidate both for precision amplification and fast integration in the discrete time system. It can be utilized in high-performance analog-to-digital converters (ADCs). In high-speed ADC utilizing pipelined architectures with residue amplification, Successive-Approximation Register (SAR) ADCs as the sub-ADC and power efficient Ring Amplifier based...
Resource Type:: Dissertation

Single-Ended Techniques for Delta-Sigma Modulators

Creator:: Lee, Calvin Y.
Abstract:: This work presents a high-resolution Delta-Sigma ADC which combines the use of the pseudo-pseudo-differential noise filtering technique with single-ended ring amplifier based integrators. The pseudo-pseudo-differential noise filtering technique utilizes single-ended circuits while maintaining the even-order rejection found in fully-differential structures which alleviates, in the active analog blocks, the need for...
Resource Type:: Dissertation

Active Noise Shaping Analog-to-Digital Data Converters

Creator:: Shi, Lukang
Abstract:: Successive-approximation-register (SAR) analog-to-digital converters are popular for medium accuracy, medium speed and low power applications, such as in biomedical applications. They have low latency and simple architecture compared with ΔΣ ADCs. This is because of SAR ADCs’ binary searching scheme. Furthermore, SAR ADCs can apply oversampling and noise shaping schemes...
Resource Type:: Dissertation

Ring Amplifier Optimized for High Resolution Analog-to-Digital Converter Applications

Creator:: ElShater, Ahmed O.
Abstract:: In recent years, SAR ADCs have been shown to acheive faster conversion times and improved power efficiencies due to their simple building blocks that are digital in nature and scale favorably with technology. High resolution ADCs with stringent noise requirement has led to the adoption of hybrid ADC architectures such...
Resource Type:: Dissertation

A 1V 40mA Fast Transient Capless LDO with 7uA Quiescent Current in 180nm CMOS using Ring Amplifier with Adaptive Damping

Creator:: Xiao, Bohui
Abstract:: Ring amplification has emerged as an efficient technique to drive large capacitive loads in switched capacitor circuits. We propose circuit techniques to demonstrate the first application of a ring amplifier in a non-capacitive feedback system of a LDO. These techniques enable a simple cap-less LDO structure in 180nm CMOS that...
Resource Type:: Masters Thesis

Ring Amplifier Design Techniques for High-Precision and High-Speed Amplification

Creator:: Leuenberger, Spencer
Abstract:: Demands of today's integrated society dependent on communication systems have driven the creation of ever more efficient analog-to-digital converters. For the same reasons, digital circuitry has rapidly expanded to serve all the different systems and needs of consumers. The trend of technology development has been to make these digital circuits...
Resource Type:: Dissertation

Next generation analog-to-digital conversion using time-based encoding and digital synthesis techniques

Creator:: Muhlestein, Jason, Russell
Abstract:: The internet-of-things is a growing market segment which is based on an arrayof portable communication devices with high power efficiency. Advanced semiconductortechnology can easily improve their digital performance, but the samecannot be said for the analog blocks which are vital to their operation. Highperformance analog circuits continue to use conventional...
Resource Type:: Dissertation

Power-Efficient Design Techniques and Architectures for Scalable Submicron Analog Circuits

Creator:: Xu, Yang
Abstract:: As the CMOS process scales down to submicron, digital circuit performance improves, while reduced supply voltage and lower transistor intrinsic gain make it difficult to implement analog circuits in a power efficient manner. Therefore, it has become advantageous to shift more analog signal processing functions conventionally realized in voltage (analog)...
Resource Type:: Dissertation

A Wide Modulation Range and PVT-Tolerant Spread-Spectrum Modulation Clock Generator

Creator:: Sun, Hyuk
Abstract:: This dissertation presents a phase domain in-loop-bandwidth spread-spectrum clock generation technique. In this proposed technique, a charge-based discrete-time loop filter is proposed to enable the phase domain in-loop-bandwidth spread-spectrum modulation without a delta-sigma modulator or time-to-digital converter. The in-loop-bandwidth modulation technique maximizes the loop bandwidth to improve phase noise suppression...
Resource Type:: Dissertation

Limitations and optimization of a blind calibration algorithm for nonlinearity in analog to digital converters

Creator:: Coker, Brandilyn
Abstract:: Analog to digital converters (ADCs) are a critical part of communication between the physical world and the increasingly digital systems humans use every day. ADCs have inherent non-idealities that degrade performance. Nonlinearity is one of the most prevalent non-idealities that designers face. While calibration methods for nonlinearity exist in the...
Resource Type:: Masters Thesis

Automated verilog-to-layout synthesis of ADCs using custom analog cells

Creator:: Waters, Allen
Abstract:: A procedure for automating the design and layout of analog-to-digital converters (ADCs) is presented. This procedure makes use of the existing synthesis and place-and-route tools that are common in digital circuit design. A method for adding rudimentary analog cells to the standard library is described, allowing the designer to synthesize...
Resource Type:: Dissertation

Dynamic biasing for ring amplification

Creator:: Farahbakhshian, Farshad
Abstract:: New amplifier architectures are presented using non-traditional methods of biasing. Time-based dynamic biasing and signal-based dynamic biasing are discussed in the context of new architectures. This includes a new form of ring amplification with a dynamic deadzone, allowing for a structure whose coarse path does not consume static power.
Resource Type:: Masters Thesis

Data driven optimization in SAR ADC

Creator:: Leung, Jerry
Abstract:: Recent publications show that successive approximation register (SAR) analog to digital converters (ADC) are capable of achieving high efficiency over other ADC topologies. Furthermore, techniques have been adopted to process signals with low activity periods, such as biomedical and industrial sensors. Prior work used least- significant bit first quantization (LSBFQ)...
Resource Type:: Masters Thesis

Efficient use of time information in analog-to-digital converters

Creator:: Hu, Yue
Abstract:: Time-domain data conversion has recently drawn increased research attention for its highly digital nature in favor of process technology scaling. Also, as the time information being carried by binary voltage, time-domain operation is much less sensitive to voltage noise compared to conventional voltage domain operation. However, for analog-to-digital converter (ADC)...
Resource Type:: Dissertation

Energy and area efficient techniques for data converters

Creator:: Venkatram, Hariprasath
Abstract:: Data converters are ubiquitous building blocks of a signal chain. The rapid increase in communication and connectivity devices presents new avenues for pushing the state of the art analog to digital converters. Techniques for improving resolution, bandwidth, linearity and bit-error rate, while reducing the power, energy and area is the...
Resource Type:: Dissertation

Design techniques for time based data converters

Creator:: Gande, Manideep
Abstract:: Modern day CMOS processes are characterized by voltage scaling and geometry scaling. Geometry scaling helps reduce gate delays, thereby aiding in the design of data converters which use time based processing. Another artifact of geometry scaling is the increase in complexity of digital circuitry available on traditional analog ICs, as...
Resource Type:: Dissertation

Power efficient analog-to-digital converters using both voltage and time domain information

Creator:: Oh, Taehwan
Abstract:: As advanced wired and wireless communication systems attempt to achieve higher performance, the demand for high resolution and wide signal bandwidth in their associated ADCs is strongly increased. Recently, time-domain quantization has drawn attention from its scalability in deep submicron CMOS processes. Furthermore, there are several interesting aspects of time-domain...
Resource Type:: Dissertation

Time and statistical information utilization in high efficiency sub-micron CMOS successive approximation analog to digital converters

Creator:: Guerber, Jon
Abstract:: In an industrial and consumer electronic marketplace that is increasingly demanding greater real-world interactivity in portable and distributed devices, analog to digital converter efficiency and performance is being carefully examined. The successive approximation (SAR) analog to digital converter (ADC) architecture has become popular for its high efficiency at mid-speed and...
Resource Type:: Dissertation

Low power high resolution data converter in digital CMOS technology

Creator:: Zheng, Zhiliang
Abstract:: The advance of digital IC technology has been very fast, as shown by rapid development of DSP, digital communication and digital VLSI. Within electronic signal processing, analog-to-digital conversion is a key function, which converts the analog signal into digital form for further processing. Recently, low-voltage and low-power have become also...
Resource Type:: Masters Thesis

Low-voltage pipeline A/D converter

Creator:: Wu, Lei
Abstract:: Continuous process scale-down and emerging markets for low-power/low-voltage mobile systems call for low-voltage analog integrated circuits. Switched-capacitor (SC) circuits are the building blocks for analog signal processing and will encounter severe overdrive problems when operating at low voltage conditions. There exist three techniques to solve the problem, but with their...
Resource Type:: Masters Thesis

Area efficiency improvement of CMOS charge pump circuits

Creator:: Perigny, Ryan
Abstract:: In this thesis, the literature relating to charge pump dc-dc converters and their uses is reviewed. Charge pumps are useful in many circuits, including low-voltage circuits, dynamic random access memory circuits, switched-capacitor circuits, EEPROM's and transceivers. The important issues relating to charge pump design are power efficiency, output voltage ripple...
Resource Type:: Masters Thesis

Error canceling low voltage SAR-ADC

Creator:: Wen, Jianping
Abstract:: The design of a switched capacitor successive approximation A/D converter is discussed in this thesis. This design adopts a novel capacitance mismatch error cancellation algorithm proposed in references [25, 27]. Detailed charge domain analysis is given in this thesis, which results in an improvement of the proposed algorithm by tracing...
Resource Type:: Masters Thesis

Low voltage switched capacitor circuits for lowpass and bandpass [delta sigma] converters

Creator:: Keskin, Mustafa
Abstract:: The most accurate method for performing analog signal processing in MOS (metal-oxide-semiconductor) integrated circuits is through the use of switched-capacitor circuits. A switched-capacitor circuit operates as a discrete-time signal processor. These circuits have been used in a variety of applications, such as filters, gain stages, voltage-controlled oscillators, and modulators. A...
Resource Type:: Dissertation

20-stage pipelined ADC with radix-based calibration

Creator:: Yun, Chong Kyu
Abstract:: A radix-based calibration technique was previously proposed with a two-stage algorithmic analog-to-digital converter (ADC). The objective of this work is to verify the capability of radix-based calibration for a true multi-stage ADC. In order to prove the idea, a single bit-per-stage, 20-stage pipelined ADC is designed in a 0.35-μm CMOS...
Resource Type:: Masters Thesis

Design techniques for low-voltage analog-to-digital converter

Creator:: Chang, Dong-Young
Abstract:: Continuous process scale-down and emerging markets for low-power/low-voltage mobile systems call for low-voltage analog integrated circuits. Switched-capacitor circuits are the building blocks for analog signal processing and will encounter severe overdrive problems when operating at low-voltage conditions. There are several well-known techniques to bypass the problem. These approaches include: (1)...
Resource Type:: Dissertation

Digital implementation of a mismatch-shaping successive-approximation ADC

Creator:: Coe, Matthew T.
Abstract:: Utilizing a two-capacitor topology, the digital implementation of an audio-band successive-approximation analog-to-digital converter (ADC) is explored in the context of mismatch-shaping where the mismatch estimates are accurate to the first order. A second-order Δ∑ loop was found to be effective in system simulations given a 0.1% capacitor mismatch. Spectral analysis...
Resource Type:: Masters Thesis

Ring amplification for switched capacitor circuits

Creator:: Hershberg, Benjamin Poris
Abstract:: A comprehensive and scalable solution for high-performance switched capacitor amplification is presented. Central to this discussion is the concept of ring amplification. A ring amplifier is a small modular amplifier derived from a ring oscillator that naturally embodies all the essential elements of scalability. It can amplify with accurate rail-to-rail...
Resource Type:: Dissertation

High-speed switched-capacitor filters based on unity-gain buffers

Creator:: Bruneau, David
Abstract:: In this work a new voltage buffer, the drain-follower, achieves 300MHz band-width with 2pF load, a dc gain of 0.993V/V, 1mV offset voltage, -60 dB total harmonic distortion at 1.4Vpp output voltage and 6.5mW power dissipation from 5V supply. A unity-gain buffer switched-capacitor biquad filter has been implemented in 0.5μm...
Resource Type:: Masters Thesis

Design of high efficiency step-down switched capacitor DC/DC converter

Creator:: Ma, Mengzhe
Abstract:: Recently, switched capacitor DC/DC converters are extensively used in portable electronic devices because they feature many advantages, such as high efficiency, small package, low quiescent current, minimal external components and low cost. In this thesis, two step-down switched capacitor DC/DC converters are designed. One has the fixed output options 1.5V,...
Resource Type:: Masters Thesis

A fully digital technique for the estimation and correction of the DAC error in multi-bit delta sigma ADCs

Creator:: Wang, Xuesheng
Abstract:: This thesis proposes a novel fully digital technique for the estimation and correction of the DAC error in multi-bit delta sigma ADCs. The structure of the DAC error is indicated through a simple model for unit-element based DACs. The impact of the DAC error on the performance of ADC is...
Resource Type:: Dissertation

A continuous time frequency translating delta Sigma Modulator

Creator:: Pulincherry, Anurag
Abstract:: This thesis presents a continuous time bandpass delta sigma modulator with frequency translation inside the delta sigma loop. The input IF signal is down converted to baseband after amplification by a low Q, wideband bandpass resonator. The down converted IF signal is digitized by a continuous time, second order lowpass...
Resource Type:: Masters Thesis

Area efficient D/A converters for accurate DC operation

Creator:: Greenley, Brandon Royce
Abstract:: The design of mixed-signal integrated circuits has evolved from simple analog and digital circuits operating on the same silicon substrate to the point that now we have complete system on a chip solutions for communication systems. The levels of integration needed to remain cost effective in today's integrated circuit (IC)...
Resource Type:: Masters Thesis

An efficient switched capacitor buck-boost voltage regulator using delta-sigma control loop

Creator:: Rao, Arun
Abstract:: Voltage converters or charge pumps find their use in many circuits. They are extensively used in hand held devices as cell phones, pagers, PDA's and laptops. Some of the important issues relating to design of voltage regulators for handheld devices are size, efficiency and noise. Another important factor to be...
Resource Type:: Masters Thesis

High-performance delta-sigma analog-to-digital converters

Creator:: da Silva, Jose Barreiro
Abstract:: Multi-stage delta-sigma (ΔΣ) architectures, commonly known as MASH, are the preferred choice for analog-to-digital converters (ADCs) used in broadband communication applications, where high-resolution (above 14 bits) and high-bandwidth (several MHz) performances are required. Current state-of-the-art designs are capable of as much as 5-MS/s output data rates with 90-dB SNR. However,...
Resource Type:: Dissertation

Fast opamp-free delta sigma modulator

Creator:: Thomas, Daniel E.
Abstract:: Switched-capacitor (SC) circuits are commonly used for analog signal processing because they can be used to realize precision filters and data converters on an integrated circuit (IC). However, for high speed applications SC circuit operating speeds are limited by the internally-compensated opamps found in SC integrators, a common building block...
Resource Type:: Masters Thesis

Accuracy enhancement techniques in low-voltage high-speed pipelined ADC design

Creator:: Li, Jipeng
Abstract:: Pipelined analog to digital converters (ADCs) are very important building blocks in many electronic systems such as high quality video systems, high performance digital communication systems and high speed data acquisition systems. The rapid development of these applications is driving the design of pipeline ADCs towards higher speed, higher dynamic...
Resource Type:: Dissertation

A 10 bit algorithmic A/D converter for a biosensor

Creator:: Rengachari, Thirumalai
Abstract:: This thesis presents a novel algorithmic A/D converter to be used in a biosensor. The converter is capable of a conversion rate of 1.5 bits/phase and hence the required conversion time is reduced. The proposed architecture is analyzed for non-ideal effects and compared with existing algorithmic A/D architectures. The converter...
Resource Type:: Masters Thesis

Power-efficient two-step pipelined analog-to-digital conversion

Creator:: Lee, Ho-Young
Abstract:: Hand-held devices are among the most successful consumer electronics in modern society. Behind these successful devices, lies a key analog design technique that involves high-performance analog-to-digital conversion combined with very low power consumption. This dissertation presents two different approaches to achieving high power efficiency from a two-step pipelined architecture, which...
Resource Type:: Dissertation

Investigation of a noise-shaping accelerometer interface circuit for two-chip implementation

Creator:: Zechmann, Jacob W.
Abstract:: The world market for sensors is several hundred million dollars growing at an annual rate of 20 percent with accelerometers comprising 19 percent of the market. With an increasing market, a wide range of applications with varying degrees of resolution are in demand. Therefore, there is sufficient motivation for developing...
Resource Type:: Masters Thesis

A tunable duty-cycle-controlled switched-R-MOSFET-C CMOS filter for low-voltage and high-linearity applications

Creator:: Xiao, Ying
Abstract:: A novel switched-R-MOSFET-C input branch is proposed for low-voltage and high-linearity applications. The tunability is achieved by varying the clock duty cycle using an automatic tuning circuit. This tuning method does not involve a change in gate voltage, and is therefore particularly suitable for low-voltage applications. The advantages of the...
Resource Type:: Masters Thesis

Design of low OSR, high precision analog-to-digital converters

Creator:: Rajaee, Omid
Abstract:: Advances in electronic systems have lead to the demand for high resolution, high bandwidth Analog-to-Digital Converters (ADCs). Oversampled ADCs are well- known for high accuracy applications since they benefit from noise shaping and they usually do not need highly accurate components. However, as a consequence of oversampling, they have limited...
Resource Type:: Dissertation

Architectural compensation techniques for analog inaccuracies in delta-sigma analog-to-digital converters, Architectural compensation techniques for analog inaccuracies in ΔΣanalog-to-digital converters

Creator:: Maghari, Nima
Abstract:: Delta-sigma analog-to-digital converters (ADCs) are suitable for many applications due to several advantages such as relaxed anti-aliasing filter, high signal-to noise and distortion ratio (SNDR) and most important of all, reduced sensitivity to analog imperfections.This thesis introduces several structures to overcome loop imperfections and stability issues in delta-sigma modulators. First,...
Resource Type:: Dissertation

Low power design techniques for analog-to-digital converters in submicron CMOS

Creator:: Musah, Tawfiq
Abstract:: Advances in process technologies have led to the development of low-power high speed digital signal processing blocks that occupy small areas. These advances are critical in the development of portable electronic devices with small feature size and long battery life. However, the design of analog and mixed-signal building blocks, especially...
Resource Type:: Dissertation

Automated synthesis of analog to digital conversion

Creator:: Weaver, Skyler
Abstract:: This thesis describes circuit architectures and techniques that facilitate the automatic synthesis and fabrication of analog-to-digital converters (ADCs). Since automated synthesis already exists for digital circuits and is part of the digital circuit design flow, this work demonstrates the feasibility of ADC synthesis with little or no modification to presently...
Resource Type:: Dissertation

Duty-cycle controlled switched resistor techniques for continuously tunable, low-voltage circuits

Creator:: Kurahashi, Peter
Abstract:: A duty-cycle controlled switched resistor is a tunable resistive element that uses pulse width modulation as the method of tuning. This thesis will describe the operation of switched resistors and propose several circuit architectures that are well suited to the use of switched resistors. These architectures include filters, mixers, and...
Resource Type:: Dissertation

Accurately tunable low-voltage continuous-time filters

Creator:: Vemulapalli, Gowtham
Abstract:: A tuning technique which tunes the continuous time filter very accurately is proposed in this thesis. This technique overcomes the problem of master slave mismatch, thus tuning the filter accurately. The mismatch minimization is done on power up on foreground while the background tuning is always operational. Once the mismatch...
Resource Type:: Masters Thesis

OP-AMP free SC biquad LPF and delta-sigma ADC

Creator:: Yoo, Kiseok
Abstract:: The objective of this work is to explore the feasibility of replacing conventional op-amps with inverters in switched-capacitor (SC) circuits. In order to verify the idea, a low-pass filter (LPF) and a second-order delta-sigma (∆Σ) analog-todigital converter (ADC) are designed in the 0.5-m CMOS technology. The low-pass filter structure is...
Resource Type:: Masters Thesis

Design of high-performance pipeline analog-to-digital converters in low-voltage processes

Creator:: Myers, Charles Grant
Abstract:: Pipeline analog-to-digital converters (ADCs) have long been used in high-speed systems for power-efficient data conversion. Broadband communication and video processing systems are placing high demands on converter accuracy and speed (above 14 bits and in the multiple-MHz range). The increasing converter requirements coupled with lower supply voltages in modern processes...
Resource Type:: Masters Thesis

High-speed CMOS dual-modulus presalers for frequency synthesis

Creator:: Desikachari, Ranganathan
Abstract:: Phase-locked loop (PLL) frequency synthesizers lie at the heart of most radio transceivers. An important objective of the electronics and communications industry is to design high-speed building blocks which dissipate the lowest possible power, and to ac- complish this with the cheapest technology. The dual-modulus prescaler is one of the...
Resource Type:: Masters Thesis

A multi-bit hybrid DSM over full-scale range without feedback DEM

Creator:: Kwon, Sunwoo, 1974-
Abstract:: Evolution of the mobile communication standards and proliferation of hand-held devices mandate stringent Analog-to-Digital Converter (ADC) speciﬁcations. Among various ADCs, a ∆Σ ADC is best known as a power-eﬃcient ADC when more than 12b is required. However, a conventional discrete-time (DT) ∆Σ Modulator (∆ΣM) is inadequate for low-power wideband applications...
Resource Type:: Dissertation

Search Constraints

Search Results

Limit your search