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  • Growth, fabrication and modeling of pseudomorphic laser diodes

    Creator:
    Ebner, John
    Abstract:
    This thesis reports on the crystal growth, fabrication, modeling and performance of Graded Index-Separate Confinement Heterostructure laser diodes which contain pseudomorphic InGaAs as the active region material. Laser epitaxial layers were grown with different indium mole-fractions, and a constant InGaAs layer thickness of 10 nm, on both sides of the...
    Resource Type:
    Dissertation
    Full Text:
    indium mole-fractions, only spontaneous emission for the 0.30 mole- fraction and no emission at all for

  • Information processing errors in linear feedback control systems

    Creator:
    Chong, Hoi-yeung
    Abstract:
    This report is concerned with the analysis of the effect of finite wordlength, channel capacity and source rate in digital feedback control of linear systems. The cases considered are (1) finite wordlength A/D conversion, no feedback delay, ideal ROM (read only memory) controller; (2) finite A/D wordlength (source rate), state...
    Resource Type:
    Dissertation
    Full Text:
    FEED- BACK CONTROL SYSTEMS Abstract approved: Redacted for Privacy ) Dr. Raymond E. Rink This report

  • Development of a 300 Hp regenerative motor and generator test facility

    Creator:
    Lewis, Timothy M. (Timothy Michael)
    Abstract:
    A 300 hp motor and generator testing facility is being completed at Oregon State University. The testing center is the largest independent testing facility west of the Mississippi River. This regional resource center will incorporate state-of-the-art features that set it apart from other testing facilities. An induction machine with a...
    Resource Type:
    Masters Thesis
    Full Text:
    no-load to 125% rated load. A virtual instrumentation system provides tremendous flexibility and

  • Fully-differential current-mode CMOS circuits and applications

    Creator:
    Zele, Rajesh H.
    Abstract:
    With increasing interest in current-mode analogue processing due to its high performance properties such as speed, bandwidth and accuracy compared to voltage-mode processing, new current-mode alternatives to various conventional circuit designs are appearing. In this report, a novel circuit design to construct a fully-differential current-mode operational amplifier ( OP-AMP )...
    Resource Type:
    Masters Thesis
    Full Text:
    various conventional circuit designs are appearing. In this report, a novel circuit design to construct a

  • Time domain characterization of interconnect discontinuities

    Creator:
    Jong, Jyh-Ming
    Abstract:
    The purpose of this study is to develop experimental techniques to characterize typical interconnect discontinuities, including bends, steps, T junctions, vias and pads, which are the most commonly encountered interconnections in high speed digital integrated circuits, hybrid and monolithic microwave circuits and electronic packages. The time domain reflection response of...
    Resource Type:
    Masters Thesis
    Full Text:
    nonuniform impedance profile or the distributed model is also presented in this report. These results for

  • Computing Substation Fragility as a Function of Seismic Component Failure

    Creator:
    Stark, William D.
    Abstract:
    The electrical grid of the Western Interconnection is vulnerable to earthquake damage, especially large-magnitude megathrust events, due to the unique seismic profile of the region. However, the size of the Western Interconnection makes it difficult to model seismic failure in electrical substations to the level of detail necessary to improve...
    Resource Type:
    Masters Thesis
    Full Text:
    existing code for work currently being done at OSU. This report will cover up to the current state of the

  • The growth of ternary compound semiconductors by molecular beam epitaxy

    Creator:
    Ebner, John
    Abstract:
    This thesis reports on an investigation of the growth, by Molecular Beam Epitaxy, of III,III-V ternary compound semiconductors. Strained and unstrained growth was studied via the deposition of InGaAs on GaAs and InP substrates. Lattice matched InGaAs on InP was grown, and an in situ method was developed to find...
    Resource Type:
    Masters Thesis
    Full Text:
    existing steps and no RHEED oscillations will occur7. These two modes of growth are shown schematically in

  • Growth, fabrication and testing of pseudomorphic P-channel GaAs/InGaAs/AlGaAs MODFETS

    Creator:
    Schulte, Donald W.
    Abstract:
    This thesis reports on the growth and characterization of p-type pseudomorphic A1GaAs /InGaAs /GaAs modulation doped field effect transistor (MODFET) structures. A series of different p-type MODFET structures were grown with a systematic variation of the indium mole fraction and quantum well width of the InGaAs channel region. Extensive characterization...
    Resource Type:
    Masters Thesis
    Full Text:
    remaining 3.4nm of the A1GaAs spacer were grown. No further growth interruptions were used and the growth

  • Assessment of Barrier Heights between ZrCuAlNi Amorphous Metal and SiO₂, Al₂O₃, HfO₂, and ZrO₂ using Internal Photoemission Spectroscopy

    Creator:
    Klarr, Tyler D.
    Abstract:
    As scaling of silicon (Si) based devices approaches fundamental limits, thin film metal-insulator-metal (MIM) tunnel diodes are attracting interest due to their potential for high speed operation. Because operation of these devices is based on tunneling, electrode / interfacial roughness is critical. Recently, it was shown that combining ultra-smooth bottom...
    Resource Type:
    Masters Thesis
    Full Text:
    energy barriers at the interfaces. In this work, we report the first use of internal photoemission

  • A hierarchically organized microprocessor system for motor position control

    Creator:
    Liu, Dongtai
    Abstract:
    Accurate Position Control is an important technique in robotic engineering. The working environment of robotic systems presents special requirements for position control. The scope of this study is to explore the control algorithms of a digital, hierarchical position control system. Detailed analysis and simulation show that the system can be...
    Resource Type:
    Masters Thesis
    Full Text:
    can lose track of 2 position because there is no feedback. A position control system using a d.c