Index Catalog // ScholarsArchive@OSU

1/f noise of GaAs resistors on semi-insulating substrates, and 1/f noise due to temperature fluctuations in heat conduction

Creator:: Choi, Mun-Seork
Abstract:: This research work focuses on the mechanism of 1/f noise in GaAs resistors on semi-insulating substrates and 1/f noise due to temperature fluctuations in heat conduction in resistors, diodes, and bipolar transistors. The goal of this research is to generate accurate models to explain physical origin of 1/f noise in...
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

5th-Order Elliptic LPF Using Passive Charge Compensation Technique (PCC) Design

Creator:: Tsai, Cheng H.
Abstract:: The passive charge compensation (PCC) technique was introduced for switched capacitor (SC) circuit to increase the slew rate and enhance the linearity performance, as PCC techniques are used on the Delta-Sigma modulator (DSM) in ADC circuitry. The PCC technique of the project was applied to the design of a SC...
Resource Type:: Masters Thesis

802.11 Channel Switching for High-Definition Video Streaming

Creator:: Sullivan, Erin
Abstract:: As screen resolution and video decoding capability have increased, high-definition (HD) video in resolutions as high as 1920 x 1080 is rapidly becoming the standard. Ad-hoc streaming of HD video over 802.11 wireless networks, e.g., streaming from a mobile device to a television, is convenient for users, but is hampered...
Resource Type:: Masters Thesis

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

A 2.4GHZ direct conversion mixer with offset cancellation

Creator:: Schmidbauer, Hardy
Abstract:: Dynamic DC offset is one of the biggest problems preventing the implementation of single chip receivers. This thesis presents a 2.4GHz downconversion mixer designed to work with adaptive DC offset cancellation for a fully integrated direct conversion receiver. Offset can be removed by dynamically changing the PFET load bias in...
Resource Type:: Masters Thesis

A 400Mb/s 850nm FSO Link based on CMOS Integrated Receiver for Hybrid WiFi and Optical Femtocells

Creator:: Chen, Siyuan
Abstract:: The increasing demand for higher data-rates is challenging to satisfy with spectrum-deﬁcient indoor WiFi networks. A novel hybrid WiFi Free-Space Optical (WIFO) system has been proposed to enhance the wireless capacity of indoor WiFi networks. In this thesis, an integrated optical wireless receiver is designed and integrated in 65-nm CMOS...
Resource Type:: Masters Thesis

A 5 GHz Wi-Fi Receiver Front End with 4x80 MHz Channels for a High Accuracy Indoor Localization System

Creator:: Gray, Kyle L.
Abstract:: The ability to accurately locate people and objects indoors will enable opportunities for control and automation of indoor environments. Current indoor localization solutions require dedicated hardware which must be custom tailored to each application. There are large technological, societal, and economic benefits in developing a more general purpose system that...
Resource Type:: Masters Thesis

A 90.5dB DR 1MHz BW Hybrid Two Step ADC with CT Incremental and SAR ADCs

Creator:: Wang, Yanchao
Abstract:: The sensors in real time data processing IoT devices require high resolution and sub-MHz data converters, usually implemented as Incremental ADCs due to the advantages of oversampling technique and low latency. In discrete time incremental (IDT) ADCs, the sampling switch non-linearity, charge injection degrade the resolution, and power hungry OPAMPs...
Resource Type:: Dissertation

A base control Doherty power amplifier design for improved efficiency in GSM handsets

Creator:: Ferwalt, Darren W.
Abstract:: In cellular telephones, RF power amplifiers consume a significant part of the total phone current. Reducing the average PA current will extend battery life. In GSM systems the handset is commanded by the base station to transmit at power levels lower than full power much of the time. A Doherty...
Resource Type:: Masters Thesis

A Blockchains-Enabled Protocol for Distributed IoT Resource Sharing On-Demand

Creator:: Al-kalbani, Mohamed A.
Abstract:: In this thesis, we propose a Blockchain-based distributed protocol for enabling deployment of dynamic, on-demand IoT networks. Specifically, the proposed protocol leverages Blockchain technology to: (i) enable distributed and secure authentication, registration, and management of IoT devices; (ii) provide fast discovery of IoT resources and scalable and secure instantiation of...
Resource Type:: Masters Thesis

A case for application-based linear transformers : applied towards text-to-spectrogram

Creator:: Agostinelli, Victor
Abstract:: Various natural language processing (NLP) tasks necessitate deep models that are fast, efficient, and small based on their ultimate application at the edge or elsewhere. While significant investigation has furthered the efficiency and reduced the size of these models, reducing their downstream latency without significant trade-offs remains a difficult task....
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

A chopper-stablized CMOS operational amplifier

Creator:: Ann, Seung-Han
Abstract:: The chopper-stabilized operational amplifier has good low frequency noise properties. Unfortunately a simple technique for simulation of the chopper-stabilized operational amplifier has not been available. This thesis describes the implementation of a differential amplifier using chopper stabilization and its circuit modeling for the SPICE simulation. This circuit has been designed...
Resource Type:: Masters Thesis

A comparative study between sinusoidal and squarewave clocking for alleviating the jitter limitation in multi-gigaHertz ADCs

Creator:: Kesharwani, Divya
Abstract:: Various applications like wireless UWB communication, fast data acquisition systems and digital storage oscilloscopes needs ADCs with instantaneous input signal bandwidth from 0.1-40 GigaHertz range with 6-10 bits of resolution -- a challenging task and an impressive goal to achieve. Flash ADCs have been conventionally employed to achieve these goals...
Resource Type:: Masters Thesis

A comparative study of AES implementations on ARM processors

Creator:: Shamsuddin, Rayees
Abstract:: AES (Advanced Encryption Standard), also known as Rijndael, is a symmetric key block cipher adopted as an encryption standard by the US government and used extensively in cryptographic applications worldwide. ARM is the most popular processor core used in embedded applications. This thesis surveys the available public implementations of AES...
Resource Type:: Masters Thesis

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

A comparison and assessment of hybrid filter topologies and control algorithms

Creator:: Chen, Lijun
Abstract:: The harmonic problem in power systems is gaining more attention as incidences correlated with harmonics increase. Conventional passive filtering techniques for harmonic mitigation have inherent problems, and purely active filters have the disadvantages of higher costs and ratings. Hybrid active filters inherit the efficiency of passive filters and the improved...
Resource Type:: Masters Thesis

A comparison of substrate noise coupling in heavily doped and lightly doped substrates for mixed-signal circuits

Creator:: Ayers, James S.
Abstract:: An analysis of substrate noise coupling in mixed-signal circuits has been performed in the TSMC 0.25 [mu]m lightly doped and heavily doped CMOS processes. Methods to minimize noise coupling in both the chip design and board design phases are presented along with techniques for accurate circuit simulation of noise coupling....
Resource Type:: Masters Thesis

A comparison of substrate noise coupling in lightly and heavily doped CMOS processes for 2.4 GHz LNA's

Creator:: Hazenboom, Duncan S.
Abstract:: Three types of low noise amplifiers operating at 2.4GHz were designed. They are the commonly used single-ended and differential amplifiers as well as a new quasi-differential amplifier. The substrate noise injected into these amplifiers is examined for both heavily and lightly doped CMOS substrates. For the single-ended amplifier the noise...
Resource Type:: Masters Thesis

A comprehensive integration of first year engineering education

Creator:: Shuman, Matthew W.
Abstract:: Retention of engineering students is a problem for many universities, especially during the first year. The problem of introducing students to engineering while increasing retention rates has recently been addressed by many different universities. Implementing novel lab structures, adjusting the lecture to incorporate more effective teaching techniques, and using orientation...
Resource Type:: Masters Thesis

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

A DC-DC converter architecture for low-power, high-resistance thermoelectric generators for use in body-powered designs

Creator:: Miller, Brian A.
Abstract:: This thesis presents a low power DC-DC converter suitable for harvesting energy from high impedance thermoelectric generators (TEGs) for the use in body powered electronics. The chip has been fabricated in a 130nm CMOS technology. To meet the power demands of body powered networks, a novel dual-path architecture capable of...
Resource Type:: Masters Thesis

A digital multiplying delay locked loop for high frequency clock generation

Creator:: Uttarwar, Tushar
Abstract:: As Moore’s Law continues to give rise to ever shrinking channel lengths, circuits are becoming more digital and ever increasingly faster. Generating high frequency clocks in such scaled processes is becoming a tough challenge. Digital phase locked loops (DPLLs) are being explored as an alternative to conventional analog PLLs but...
Resource Type:: Masters Thesis

A direct-conversion offset-cancellation mixer in 2.4 GHz CMOS

Creator:: Lehne, Mark A.
Abstract:: We present a new circuit design for adaptive offset cancellation in a fully differential 2.4 GHz CMOS direct conversion mixer. Our circuit structure is a modification of a Gilbert cell mixer in which offsets are cancelled by injecting cancellation currents into the legs of the mixer by dynamically varying the...
Resource Type:: Masters Thesis

A direct-drive wave energy converter with contactless force transmission system

Creator:: Agamloh, Emmanuel B.
Abstract:: Commonly proposed ocean wave energy converters (OWEC) use inefficient and maintenance demanding intermediate hydraulic and pneumatic systems. We propose a novel rotary direct-drive OWEC that eliminates these intermediate stages. The new device employs a contactless force transmission system (CFTS) comprising a “piston” and a “cylinder” and a ball screw to...
Resource Type:: Dissertation

A dual-path 2-0 MASH ADC with dual digital error correction

Creator:: Zhang, Zhenyong
Abstract:: This dissertation presents a dual-path 2-0 MASH (Multi-stAge-noise -SHaping) ADC with two verified digital corrections of DAC mismatch error and quantization noise leakage. By using these two techniques, the requirements for the analog circuits are greatly relaxed. The dual-path structure generates two outputs, one only composed of conversion errors, the...
Resource Type:: Dissertation

A force control algorithm for a wave energy linear test bed

Creator:: Henshaw, Nathan R.
Abstract:: Researchers at Oregon State University, focusing on the development of ocean wave energy converters, have designed and installed a unique linear test bed to aid in the characterization of these converters. Under the original control scheme, the linear test bed follows a position profile and is limited in its ability...
Resource Type:: Masters Thesis

A frequency-domain approach to simulating wave energy converter hydrodynamics

Creator:: Simmons, Asher
Abstract:: Wave energy converter (WEC) devices are complicated systems containing hydrodynamic, mechanical, and electrical elements. WEC design efforts are primarily focused in the time-domain, using frequency-based energy analyses and numerical problem solving approaches that are staples in hydrodynamic design efforts to form the basic information set used in these time-domain development...
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 Fully Integrated Bio-potential Low-noise Amplifier Utilizing Capacitor Multipliers

Creator:: Yong, OnnLim
Abstract:: In any biomedical signal acquisition system, a front-end amplifier is needed to amplify low amplitude bio-signals while filtering out any unwanted low-frequency artifacts. The design of low frequency poles within the sub-Hz range implies very large time-constants which goes against system integrability. In recent years, the pseudo resistor has been...
Resource Type:: Masters Thesis

A fuzzy logic controller design and simulation for a sawmill bucking system

Creator:: Delgado, Fidel
Abstract:: This document investigates, justifies, designs, and simulates the application of a fuzzy logic controller/optimizer in a sawmill bucking system application that is the first production station where stems coming from the mountains are processed in a sawmill. One of the areas of success in the application of fuzzy logic is...
Resource Type:: Masters Thesis

A Generation Prioritization Method for Power System Restoration with Renewable Resources

Creator:: Mate, Adam
Abstract:: The electrical grid is a key component of the Nation's critical infrastructure. Its continuous and reliable operation is of vital importance; any system-wide disruption would have a debilitating impact on crucial services, public health and safety, the economy, and the national security of the United States. High-impact low-frequency events pose...
Resource Type:: Dissertation

A high power emulation of a wind farm

Creator:: Lalla, Chelsea
Abstract:: As more wind farms are connected to the grid, the variable nature of wind energy begins to influence grid stability. Energy storage could help smooth the variable nature of wind energy. Laboratory demonstration and exploration of the interaction between different energy storage devices and wind energy could help improve and...
Resource Type:: Masters Thesis

A high-swing CMOS operational amplifier topology

Creator:: Yang, John Jian
Abstract:: A circuit topology for high-swing, high-linearity CMOS operational amplifiers has been developed. The technique uses parallel-connected p- and n-channel input pairs to realize an input common-mode voltage range nearly equal to the total power supply voltage. High linearity is achieved by summing the DC bias and AC small-signal currents so...
Resource Type:: Masters Thesis

A linear test bed for characterizing the performance of ocean wave energy converters

Creator:: Hogan, Peter M.
Abstract:: Determining the performance characteristics of various ocean wave energy converters (OWEC) has proven to be difficult due to problems replicating a baseline motion profile in the ocean or wave tank to compare these devices. The linear test bed seeks to mechanically simulate the relative linear motion between the active components...
Resource Type:: Masters Thesis

A methodology for efficient substrate noise estimation from large scale digital circuits in mixed signal SoC's

Creator:: Held, Martin A.
Abstract:: A methodology for rapid estimation of substrate noise generated by digital circuitry in mixed-signal circuits is presented. This methodology is incorporated into the Silencer! framework, and also provides for future improvements including pre-layout noise estimation. Measurements of a test chip fabricated in the TSMC o.25[mu]m heavily doped logic process validate...
Resource Type:: Masters Thesis

A methodology to enable wind farm automatic generation control

Creator:: Han, Hai-Yue
Abstract:: Over the last decade the increase in penetration of wind power and its variable nature has begun to add considerable stress to and threatened the stability of the nation's grid. In order to continue growth wind farms will need to have the ability to participate in the same grid frequency...
Resource Type:: Dissertation

A methodology to reduce the strain on hydro turbines using advanced life extending control of multiple energy storage systems

Creator:: Brosig, Sean G.
Abstract:: Over the last 20 years, there has been rapid growth in the amount of installed wind power in the Pacific Northwest, specifically in the Columbia River Gorge. The variable and non-dispatchable nature of this resource requires that it be balanced in some form by other sources on the grid. In...
Resource Type:: Masters Thesis

A Micro Scale Magnetic Particle Imaging System

Creator:: Lenox, Philip A.
Abstract:: Magnetic particle imaging (MPI) is a biomedical imaging technique which detects the presence of magnetic nanoparticles which have been introduced into the specimen prior to imaging. MPI has shown promise for real-time imaging with spatial resolution comparable to magnetic resonance imaging (MRI). MPI research has focused predominantly on the development...
Resource Type:: Masters Thesis

A Microgrid Design Case Study : Synchrophasor Placement and Development of a Protection Laboratory for the Oregon State University - Corvallis Campus

Creator:: Huo, Chen
Abstract:: In the past two years, Oregon State University (OSU) Corvallis campus suffered several power outages. The estimated cost of one of those outages was close to a million dollars worth of equipment and impact on research projects. Meanwhile, the campus grid operates with severely aging power assets. The reliability of...
Resource Type:: Masters Thesis

A Microwave Signal Correlator Based on Parametric Pumping of Spin Waves

Creator:: Hansen, Mikkel N.
Abstract:: This work demonstrates correlation of microwave signals encoded with 16-bit codes using the parametric interaction of spin waves. Signal processing correlators are devices that compare two signals, such as a reference code and a received code, where the output indicates the similarity between the signals. Correlators are used in communication...
Resource Type:: Masters Thesis

A MOSCAP pipeline pseudo passive DAC

Creator:: Behera, Prachee Shree
Abstract:: The design of a 10-bit pipelined charge redistribution DAC employing MOSCAPs biased in their accumulation mode is presented in this thesis. A switched capacitor filter and output buffer have also been designed for the system. The effect of MOSCAP nonlinearity on the performance of the pipelined charge redistribution DAC has...
Resource Type:: Masters Thesis

A motor-generator and supercapacitor based system for microgrid frequency stabilization

Creator:: Crispo, Richard F.
Abstract:: This research introduces an energy storage system to deliver microgrid frequency response. A doubly-fed induction generator (DFIG) and a squirrel cage induction machine (SCIM) are coupled together as a motor/generator set to deliver an immediate inertial response to a change of frequency, and an inverter and supercapacitors deliver short term...
Resource Type:: Masters Thesis

A multi-bit delta sigma audio digital-to-analog converter

Creator:: Wang, Ruopeng
Abstract:: Digital-to-analog converters (DACs) with wide dynamic range and high linearity are required for high-end audio applications. A multi-bit delta sigma audio DAC, using a novel gain-correction technique, is described in this thesis. For widely varying on-chip RC time constant, the DAC gain can be accurately controlled by the correction circuitry....
Resource Type:: Dissertation

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

A Multiresolution Analysis of Temporal Logic

Creator:: Pelphrey, Richard E.
Abstract:: Is it possible to determine whether a signal violates a formula in Signal Temporal Logic (STL), if the monitor only has access to a low-resolution version of the signal? We answer this question affirmatively by demonstrating that temporal logic has a multiresolution structure, which parallels the multiresolution structure of signals....
Resource Type:: Masters Thesis

A nano-power wake-up circuit for RF energy harvesting wireless sensor networks

Creator:: Lindsley, Christopher J.
Abstract:: A fully integrated CMOS latched comparator is presented for use as a wake-up circuit that is attached to an RF energy harvester in a battery free wireless sensor network. The system consumes less than 36nA static current at 20°C and dissipates 2pJ of energy per conversion. The comparator comprises of...
Resource Type:: Masters Thesis

A new and improved control of a power electronic converter for stabilizing a variable speed generation system using an embedded microcontroller

Creator:: Venkatswamy, Suresh
Abstract:: A new and improved stabilizer was developed for the variable speed generation (VSG) system. The VSG system exhibits periodic oscillations which sometimes leads to a loss of synchronism. After careful study, a simple but effective strategy to stabilize the system was implemented with real time digital feedback control. The VSG...
Resource Type:: Masters Thesis

A new data encoding scheme for equalization - Integrated Pulse Width Modulation (iPWM)

Creator:: Ramachandran, Ashwin
Abstract:: This work presents a new data encoding scheme: Integrated Pulse Width Modulation (iPWM) for equalizing lossy wireline channels with the aim of achieving energy efficient wireline communication. The proposed scheme is able to overcome the fundamental limitations imposed by Manchester and Pulse Width Modulation (PWM) encoding on high data rate...
Resource Type:: Masters Thesis

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