Index Catalog // ScholarsArchive@OSU

A comparative study of lowpass continuous-time delta-sigma modulators with pulse-shaped DACs

Creator:: Fang, Jie
Abstract:: Recently, continuous-time ΔΣ modulators are appearing increasingly often in both the literature and the marketplace due to their features of inherent antialiasing and relaxed requirements for opamp and so on. However, several nonideal factors such as clock jitter, excess loop delay, inter-symbol interference and so on, degrade the SNR performance...
Resource Type:: Masters Thesis

Noise optimization for low-voltage CMOS audio preamplifier systems

Creator:: Brown, Matthew Eugene
Abstract:: There is a large and growing market for portable consumer audio products with very small size. As the size of these products is reduced, the area occupied by batteries becomes significant and hence limits the number of batteries to one. In order to build such small products, high levels of...
Resource Type:: Masters Thesis

A channelized digital receiver design for UWB sytems in a multipath indoor environment

Creator:: Chang, Yuhao
Abstract:: This thesis presents a channelized digital receiver design for UWB sytems in a multipath indoor environment. The UWB technology has been used for commercial and military purposes due to a number of advantages such as low-power consumption, noise-like and carrier free. The energy of UWB signal is spread over a...
Resource Type:: Masters Thesis

Scaled modeling and simulation of ocean wave linear generator buoy systems

Creator:: Gore, Ganesh P.
Abstract:: Accurate scaled modeling and simulation are critical to advancing ocean wave linear generator buoys. A 100th scaled model of ocean wave generator buoy systems is analyzed by solving the Navier-Stokes equations. These equations are numerically solved using Computational Fluid Dynamics (CFD) by implementing the front capturing method. In this thesis,...
Resource Type:: Masters Thesis

Single-level dynamic register caching architecture for high-performance superscalar processors

Creator:: Liebert, John A.
Abstract:: The amount of instruction level parallelism (ILP) that can be exploited depends greatly on the size of the instruction window and the number of in-flight instructions the processor can support. However, this requires a register file with a large set of physical registers for renaming and multiple ports to provide...
Resource Type:: Masters Thesis

Comparison and impact of substrate noise due to clocked and clockless circuitry

Creator:: Le, Jim K.
Abstract:: Delay insensitive asynchronous circuitry provides significant advantages with respect to substrate noise due to localized switching. The differences between the substrate noise from NULL Convention Logic (NCL) and traditional Clocked Boolean Logic (CBL) are described and analyzed based on measured results. A test chip fabricated in the TSMC 0.25 um...
Resource Type:: Masters Thesis

Modified VLSI designs for error correction codes

Creator:: Chen, Lupin
Abstract:: Nowadays, error correction codes have become an integral part in almost all the modern digital communication and storage systems. With the continuously increasing demands for higher speed and lower power communication systems, efficient VLSI implementations of those error correction codes have great importance for practical applications. In this thesis, several...
Resource Type:: Masters Thesis

Architecture design of multiplexed incremental analog-to-digital converters

Creator:: Zhang, Zhiqing
Abstract:: Analog-to-Digital Data Converters (ADCs) used in instrumentation and measurements often require high absolute accuracy, including excellent linearity and negligible dc offset. Incremental data converters (IDCs) provide a solution for such measurement applications. Since IDCs are essentially delta-sigma converters with reset operation before each conversion, they retain most of the advantages...
Resource Type:: Masters Thesis

A survey on continuous-time modulators : theory, designs and implementations

Creator:: Gao, Xiaoran
Abstract:: Recently, delta-sigma modulation has become a widely applied technique for high-performance analog-to-digital conversion of narrow-band signals. Most of the early designs used discrete-time structure for good accuracy and good linearity. The transfer functions are independent of the clock frequency. However, high unity-gain bandwidths of the opamps are required to satisfy...
Resource Type:: Masters Thesis

Side channel attack resistant elliptic curves cryptosystem on multi-cores for power efficiency

Creator:: Yoo, Jaewon
Abstract:: The Advent of multi-cores allows programs to be executed much faster than before. Cryptoalgorithms use long-bit words thus parallelizing these operations on multi-cores will achieve significant performance improvement. However, not all long-bit word operations in cryptosystems are suitable for parallel execution on multi-cores. In particular, long-bit words used in Elliptic...
Resource Type:: Masters Thesis

Digital pulse shape discrimination methods for triple-layer phoswich detectors using wavelets and fuzzy logic

Creator:: Yousefi, Siavash
Abstract:: A two-channel data acquisition system for simultaneous detection and discrimination of beta particles and gamma rays has been developed. Each channel measures and analyzes the input pulses resulting from the absorption of radiation in the layers of the detector. The detector is a triple-layer phoswich (phosphor sandwich) scintillation detector followed...
Resource Type:: Masters Thesis

An ultra low voltage micropower GPS receiver RF front-end for wildlife tracking

Creator:: Heiberg, Adam C.
Abstract:: A fully integrated CMOS GPS receiver RF front end optimized for low power operation is presented. The system operates with a supply voltage down to 250 mV. A prototype has been fabricated in a 0.13μm CMOS process and includes a low voltage LNA, quadrature oscillators, and quadrature mixers. It exhibits...
Resource Type:: Masters Thesis

An enhanced swing differential Colpitts CMOS VCO for low-voltage operation

Creator:: Farahbakhshian, Farhad
Abstract:: An enhanced swing differential Colpitts VCO (ESDC-VCO) dramatically improves the swing of a Colpitts VCO by allowing the signal to swing below ground and above the supply voltage. Fabricated in a 1P8M 0.13 um CMOS process, the ESDC-VCO operates at 4.9GHz with a 0.475-V supply and consumes 2.7mW. The measured...
Resource Type:: Masters Thesis

Generalized radix design techniques for low-power, low voltage pipelined and cyclic analog-digital converters

Creator:: Sharma, Vivek
Abstract:: This thesis proposes a novel technique for the design of pipelined and cyclic ADCs utilizing generalized radix gain stages. Several models have been proposed for the optimization of high performance pipelined ADCs by various researchers. This work builds upon them, using a simple but accurate model to estimate the optimal...
Resource Type:: Masters Thesis

An ultra low power frequency reference for timekeeping applications

Creator:: Oporta, Hector Ivan
Abstract:: An ultra low power crystal oscillator that provides a frequency reference for battery powered timekeeping applications is presented. An amplitude control circuit is employed to ensure that minimum current is consumed. A subthreshold voltage regulator provides a supply voltage for the oscillator with minimum current consumption. The oscillator and regulator...
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

Modeling and simulation methods for RF MEMS VCOs

Creator:: Sankaranarayanan, Janakiram Ganesh
Abstract:: This work focusses on the modeling and the development of efficient coupled simulation techniques for MEMS based RF oscillators. High-level models for MEMS based varactors have been discussed and their accuracy issues are identified, based on comparisons with numerical simulations. A faster simulation approach based on the time-domain shooting method...
Resource Type:: Masters Thesis

A novel linear generator for wave energy applications

Creator:: Ernst, Steven George
Abstract:: With the increasing effort to identify alternative methods of energy generation, extraction of ocean energy has gathered a large interest. Research and industry have begun considering wave energy as the next new alternative energy. The unique challenges of ocean energy requires a wave energy converter to be both robust and...
Resource Type:: Masters Thesis

Urban military operation mobility model

Creator:: Kang, Ho Sung
Abstract:: A Mobile Ad-hoc NETwork (MANET) is collection of wireless mobile nodes without a network infrastructure or centralized administration. Although MANETs can be used in many applications, such as mobile Internet, military communication, and disaster relief networks, a number of challenges remain. These include routing, medium access control, security, scalability, energy...
Resource Type:: Masters Thesis

Ultra low capacitance RFIC probe

Creator:: Jacob, Michael E.
Abstract:: In Radio Frequency Integrated Circuits (RFIC) or high frequency digital ICs, there is a demand to probe the internal nodes for testing. The ultra low capacitance RFIC probe presented in his work is a flexible tool for these applications. The probe utilizes the coupling between a tungsten needle and the...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

A comparative study of lowpass continuous-time delta-sigma modulators with pulse-shaped DACs

Noise optimization for low-voltage CMOS audio preamplifier systems

A channelized digital receiver design for UWB sytems in a multipath indoor environment

Scaled modeling and simulation of ocean wave linear generator buoy systems

Single-level dynamic register caching architecture for high-performance superscalar processors

Comparison and impact of substrate noise due to clocked and clockless circuitry

Modified VLSI designs for error correction codes

Architecture design of multiplexed incremental analog-to-digital converters

A survey on continuous-time modulators : theory, designs and implementations

Side channel attack resistant elliptic curves cryptosystem on multi-cores for power efficiency

Digital pulse shape discrimination methods for triple-layer phoswich detectors using wavelets and fuzzy logic

An ultra low voltage micropower GPS receiver RF front-end for wildlife tracking

An enhanced swing differential Colpitts CMOS VCO for low-voltage operation

Generalized radix design techniques for low-power, low voltage pipelined and cyclic analog-digital converters

An ultra low power frequency reference for timekeeping applications

High-speed CMOS dual-modulus presalers for frequency synthesis

Modeling and simulation methods for RF MEMS VCOs

A novel linear generator for wave energy applications

Urban military operation mobility model

Ultra low capacitance RFIC probe

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