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  • 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
    Full Text:
    of pulse-width-modulation (PWM) scheme is proposed and described: time symmetric PWM (TSPWM). An

  • Performance of a binary pulse position modulated ultra-wideband system with direct sequence spreading for multiple access

    Creator:
    Venkatesan, Vinod
    Abstract:
    There has been tremendous technological advancement in the area of high-speed indoor wireless local area networks (WLAN's) in recent years. All the existing tech- nologies such as IEEE 802.11a,b are bandwidth limited and high powered systems. The challenge any wireless technology faces is to minimize both the power consumption and...
    Resource Type:
    Masters Thesis
    Full Text:
    . This thesis analyzes the error performance of a UWB system with pulse position modulation (PPM) for

  • 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
    Full Text:
    Pulse-Shaped DACs Abstract approved

  • Implementation of an ultra-wideband transceiver for sensor applications

    Creator:
    Jann, Benjamin J.
    Abstract:
    Ultra-wideband (UWB) radio is the transmission of data using an extremely wide bandwidth and very low power spectral density. In this thesis, the mereits and challenges of UWB architectures versus conventional narrowband architectures will be compared. Pulsed UWB systems can be implemented with very simple architectures. These advantages make UWB...
    Resource Type:
    Masters Thesis
    Full Text:
    ...........................................................................17 4.7.3 Pulse Position Modulation

  • Low Frequency Oscillation Reduction Algorithm for Six-step Operation of Three-Phase Inverters

    Creator:
    Ke, Ziwei
    Abstract:
    A power inverter, or inverter, is an electronic device or circuitry that converts direct currents (DC) to alternating currents (AC) in the power electronics family. A three-phase inverter converts DC current to three-phase AC current. Inverters, especially three-phase inverters, have been widely used in many fields including renewable energy applications...
    Resource Type:
    Masters Thesis
    Full Text:
    systems, the three-phase inverters can be operated by the Pulse Width Modulation (PWM) control or six

  • Hybrid electric vehicle dc-bus converter harmonics

    Creator:
    Mills-Price, Michael A.
    Abstract:
    As more advanced hybrid electric vehicles begin emerging onto the commercial market, design algorithms for their control become increasingly more complicated. One major hurdle for designers is the mitigation and control of the created high frequency harmonics caused from switching the dc voltage into an ac voltage by use of...
    Resource Type:
    Masters Thesis
    Full Text:
    algorithms. In Space Vector Pulse Width Modulation (SVPWM) schemes, the three-phase system is transformed

  • Oscilloscope sampling converter for observing nanosecond waveforms

    Creator:
    Leabo, Dell Patrick
    Resource Type:
    Masters Thesis
    Full Text:
    cycle. The output trigger pulse is delayed by propagation through an electronic delay line, such as a

  • A delta-sigma pulse width modulator with pulse dithering

    Creator:
    Lewison, Richard S.
    Abstract:
    Pulse Width Modulation (PWM) has been used extensively for motor control, DC-AC converters, DC-DC converters and in audio applications. The conventional method of generating a pulse width modulated signal involves generating an accurate sawtooth or triangle wave using analog circuits. In CMOS, being analog circuit intensive puts extra constraints on...
    Resource Type:
    Masters Thesis
    Full Text:
    WIDTH MODULATION (DSPWM) 13 3.1 DSPWM Block Diagram 14 3.1.1 DSM 14 3.1.2 Accumulator 14 3.1.3 Pulse

  • Pulse reader for ionization chambers

    Creator:
    Boothe, Gary F.
    Abstract:
    A pulse reader for ionization chambers has been developed, tested, and calibrated. An insulated gate field effect transistor (IGFET) was used to detect the pulses and Victoreen Model 362 Pocket Chambers were used as ionization chambers. The energy dependence of the Victoreen Model 362 Pocket Chamber was determined to be...
    Resource Type:
    Masters Thesis
    Full Text:
    Radiological Physics Title: (Major) for the Master of Science (Degree) ,/ (Date presented on Pulse Reader

  • Linearizing techniques for voltage controlled oscillator based analog to digital converters

    Creator:
    Rao, Sachin B.
    Abstract:
    Voltage controlled oscillator (VCO) based ADC is an important class of time-domain ADC that has gained widespread acceptance due to their several desirable properties. VCO-based ADCs behave like an open-loop continuous time ΔΣ modulator and achieve excellent resolution by first order noise shaping the quantization error. However, the SNDR of...
    Resource Type:
    Dissertation
    Full Text:
    4.3 Uniform sampling pulse width modulation. (a) Basic block dia­ gram and principle of operation. (b