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Filtering by: Subject Electric rheostats -- Design and construction Remove constraint Subject: Electric rheostats -- Design and construction Degree Name Doctor of Philosophy (Ph.D.) Remove constraint Degree Name: Doctor of Philosophy (Ph.D.)

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  • Advanced propulsion systems for linear motion with high performance requirements

    Creator:
    Zhou, Xiaolin
    Abstract:
    Traditionally linear actuator applications are addressed by the use of hydraulic systems. The high maintenance cost and poor reliability will always be the most critical problem in the real applications. Benefited from both the high mechanical advantage of the roll screw and the simple structure of the switched reluctance motor,...
    Resource Type:
    Dissertation
    Full Text:
    simulation and the experimental results verified the validity of the high thrust linear actuator design

  • Automated analysis, design, and optimization of low noise oscillators

    Creator:
    Vytyaz, Igor
    Abstract:
    Low noise oscillators are universally needed in digital systems for clock generation and synchronization, and in radio-frequency communication front-ends for frequency up- and down-conversion. Noise in oscillators results in timing jitter, and limits the clock frequency of digital systems. In radio-frequency communication systems, phase noise in oscillators lowers the signal-to-noise...
    Resource Type:
    Dissertation
    Full Text:
    Analysis, Design, and Optimization of Low Noise Oscillators Abstract approved: Kartikeya Mayaram Un-Ku

  • Design of CMOS switched-current filters

    Creator:
    Fiez, Theresa S.
    Abstract:
    The design and implementation of Switched-Current (SI) ladder filters is described. SI filters require only a standard digital CMOS process and the power supply voltage requirement is low. SI circuits also can be potentially operated at higher frequencies than Switched-Capacitor (SC) filters due to the low-impedance wideband nodes of the...
    Resource Type:
    Dissertation
    Full Text:
    Abstract approved: Dr. Davi J. Allstot The design and implementation of Switched-Current (SI) ladder

  • Design of self-synchronized asynchronous sequential state machines using asymmetrical delay elements

    Creator:
    Kirkpatrick, Donald C.
    Abstract:
    A design style is presented for a self-synchronized, multiple input change, asynchronous state machine which processes input changes at a speed limited only by the required machine behavior and implementation technology. This state machine will operate at this ultimate speed because of a new asynchronous delay element with unequal rising...
    Resource Type:
    Dissertation
    Full Text:
    -Synchronized Asynchronous Design 4 BASIC CONCEPTS AND DEFINITIONS 6 REVIEW OF LITERATURE 14 THE DELAY

  • Enabling metal-fill-aware design of integrated circuits

    Creator:
    Shilimkar, Vikas S.
    Abstract:
    In advanced integrated circuit (IC) processes, the metal fill inserted to meet foundry imposed density requirements degrades the performance of interconnects and passive components which ultimately affects the overall circuit performance. Accounting for this degradation through electromagnetic and equivalent circuit modeling is becoming a critical aspect of IC design. However,...
    Resource Type:
    Dissertation
    Full Text:
    electromagnetic and equivalent circuit modeling is becoming a critical aspect of IC design. However

  • Inductors in high-performance silicon radio frequency integrated circuits : analysis, modeling, and design considerations

    Creator:
    Lutz, Richard D., Jr
    Abstract:
    Spiral inductors are a key component of mixed-signal and analog integrated circuits (IC's). Such circuits are often fabricated using silicon-based technology, owing to the inherent low-cost and high volume production aspects. However, semiconducting substrate materials such as silicon can have adverse effects on spiral inductor performance due to the lossy...
    Resource Type:
    Dissertation
    Full Text:
    : Inductors in High-Performance Silicon Radio Frequency Integrated Circuits: Analysis, Modeling, and Design

  • 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
    Full Text:
    is to design and explore future low-voltage switched- capacitor circuits, which are crucial for

  • Non-Stoichiometry in Bismuth Perovskite Solid Solutions

    Creator:
    Prasertpalichat, Sasiporn
    Abstract:
    The role of A-site non-stoichiometry was investigated in lead-free piezoelectric ceramics based on compositions in the 1-x(Bi₀.₅Na₀.₅TiO₃)-xBaTiO₃ system near the morphotropic phase boundary where x = 0.055, 0.06 and 0.07. The samples were prepared by a conventional solid state mixed oxide route with the A- site stoichiometry modified to incorporate...
    Resource Type:
    Dissertation
    Full Text:
    consecutive electric pulses in positive and negative direction. A subtraction of polarization response from

  • Wideband discrete-time delta-sigma analog-to-digital converters with shifted loop delays

    Creator:
    Meng, Xin
    Abstract:
    Low-distortion architecture is widely used in wideband discrete-time switched-capacitor delta-sigma ADC design. However, it suffers from the power-hungry active adder and critical timing for quantization and dynamic element matching (DEM). To solve this problem, this dissertation presents a delta-sigma modulator architecture with shifted loop delays. In this project, shifted loop...
    Resource Type:
    Dissertation
    Full Text:
    Corporation (SRC), the Center for Design of Analog and Digital Integrated Circuits (CDIDIC), Texas