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Dissertations / Theses on the topic 'Low and high frequency floor'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Al-Anbaki, Atheer Faisal Hameed. "Footfall excitation of higher modes of vibration in low-frequency building floors." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/34081.

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This thesis investigates the footfall excitation of higher modes of vibration in low-frequency floor structures. This is motivated by the increased number of floors reportedly failing to meet the required occupants comfort level although being designed in accordance with the current state-of-the-art design guidelines. In particular modern, lightweight, and slender floor structures. The contribution to knowledge of this thesis can be summarised as: quantifying the signal energy of measured walking forces within and above the natural frequency cut-off proposed by the current state-of-the-art des

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2

Bradley, Christopher R. "Very low frequency seismo-acoustic noise below the sea floor (0.2-10 Hz)." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/58250.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, and the Woods Hole Oceanographic Institution, 1994.<br>Includes bibliographical references (leaves 235-245).<br>by Christopher Robert Bradley.<br>Ph.D.

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3

Davis, Douglas Bradley. "Finite Element Modeling for Prediction of Low Frequency Floor Vibrations Due to Walking." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/28634.

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Floor vibration serviceability is a primary design consideration for steel framed floors. Designers in North America typically use the AISC Design Guide 11 methods to check this limit state, but its methods are difficult to apply to atypical floor framing. Finite element analysis is a logical choice for predicting vibration response to walking, but simplified designer-friendly procedures are not available. Three relatively simple, experimentally verified methods of predicting low frequency floor vibration due to walking are presented in this dissertation. The methods are based on finite el

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4

Olsson, Jörgen. "Low Frequency Impact Sound in Timber Buildings : Simulations and Measurements." Licentiate thesis, Linneaus Univeristy, Sweden; SP Technical Research Institute of Sweden, Sweden, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-58068.

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An increased share of construction with timber is one possible way of achieving more sustainable and energy-efficient life cycles of buildings. The main reason is that wood is a renewable material and buildings require a large amount of resources. Timber buildings taller than two storeys were prohibited in Europe until the 1990s due to fire regulations. In 1994, this prohibition was removed in Sweden. Some of the early multi-storey timber buildings were associated with more complaints due to impact sound than concrete buildings with the same measured impact sound class rating. Research in

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5

Mahattanakul, Jirayuth. "High frequency, low distortion current-mode filters." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300970.

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6

Worapishet, Apisak. "High frequency low power switched-current techniques." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392911.

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7

Li, Wei Ph D. Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science. "Very-high-frequency low-voltage power delivery." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82352.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 217-223).<br>Power conversion for the myriad low-voltage electronic circuits in use today, including portable electronic devices, digital electronics, sensors and communication circuits, is becoming increasingly challenging due to the desire for lower voltages, higher conversion ratios and higher bandwidth. Future computation systems also pose a major challenge in energy delivery that is difficult

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8

Rogers, Olivia. "The effect of high‐frequency, low‐magnitude." Thesis, Faculty of Dentistry, 2010. http://hdl.handle.net/2123/7090.

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9

Meninger, Scott (Scott Edward) 1974. "Low phase noise, high bandwidth frequency synthesis techniques." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33860.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.<br>Includes bibliographical references (p. 243-249).<br>A quantization noise reduction technique is proposed that allows fractional-N frequency synthesizers to achieve high closed loop bandwidth and low output phase noise simultaneously. Quantization induced phase noise is the bottleneck in state-of-the-art synthesizer design, and results in a noise-bandwidth tradeoff that typically limits closed loop synthesizer bandwidths to be <100kHz for adequate phase noise performance to be

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10

Abou-Fakher, Yehia. "Implementing and simulating low frequency inverters using high frequency transformers and devices." Thesis, University of Bath, 1997. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362147.

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11

Tan, Hui Boon. "Disentangling low-frequency versus high-frequency economic relationships via regression parameter stability tests." Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/38575.

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12

Larsson, Anders. "On high-frequency distortion in low-voltage power systems." Doctoral thesis, Luleå tekniska universitet, Energivetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26658.

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Power quality is a subject that has received a lot of attention during the last 10 to 20 years, both in industry and in academia. Power quality concerns interaction between the power grid and its customers and between the power grid and equipment connected to it, reflected in voltages and currents. Research and other developments in this area have to a great extent concentrated on relatively slow and low-frequency phenomena, with the main emphasis being on voltage dips (reductions in voltage magnitude with duration between about 50 ms and several seconds) and low-frequency harmonics (waveform

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13

Bolborici, Valentin. "Design of low-profile transformers for high-frequency operation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0006/MQ45982.pdf.

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14

Salazar, Nathaniel Jay Tobias. "High frequency AC power converter for low voltage circuits." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/77026.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 74-76).<br>This thesis presents a novel AC power delivery architecture that is suitable for VHF frequency (50-100MHz) polyphase AC/DC power conversion in low voltage integrated circuits. A complete AC power delivery architecture was evaluated demonstrating the benefits of delivering power across the interconnect at high voltage and lower current with on- or over-die transformation to low voltage

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15

Yang, Rachel S. (Rachel Shanting). "Low-loss inductor design for high-frequency power applications." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/123006.

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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2019<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 72-74).<br>Miniaturization of power electronics can improve the performance of many applications, such as renewable energy systems, data centers, and aerospace systems. Operation in the high frequency (HF) regime (3{ 30 MHz) h

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16

Yang, Boyi. "High Performance Low Voltage Power MOSFET for High-Frequency Synchronous Buck Converters." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5582.

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Power management solutions such as voltage regulator (VR) mandate DC-DC converters with high power density, high switching frequency and high efficiency to meet the needs of future computers and telecom equipment. The trend towards DC-DC converters with higher switching frequency presents significant challenges to power MOSFET technology. Optimization of the MOSFETs plays an important role in improving low-voltage DC-DC converter performance. This dissertation focuses on developing and optimizing high performance low voltage power MOSFETs for high frequency applications. With an inherently la

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17

Palmer, Joseph. "A HIGH-ACCURACY AND LOW-COMPLEXITY CARRIER-OFFSET-FREQUENCY ESTIMATOR." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604513.

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ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>A single-tone frequency estimator for a non-uniformly sampled sinusoid is proposed. A nonuniformly sampled sinusoid may be generated from the received training sequences of a telemetry link. The frequency of the sinusoid matches the carrier-frequency-offset (CFO) of the received signal, and estimation of this quantity allows a receiver to compensate for the CFO. The performance bounds of this

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18

Ng, Wing Lun. "Low-voltage high-frequency CMOS transformer-feedback voltage-controlled oscillators /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?ECED%202006%20NG.

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19

Sandén, Martin. "Low-Frequency Noise in Si-Based High-Speed Bipolar Transistors." Doctoral thesis, KTH, Microelectronics and Information Technology, IMIT, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3203.

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20

Schrama, Judith Marije. "High-frequency magneto-conductivity studies of low-dimensional organic conductors." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365779.

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21

Liao, Yizheng. "Phase and Frequency Estimation: High-Accuracy and Low- Complexity Techniques." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/283.

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The estimation of the frequency and phase of a complex exponential in additive white Gaussian noise (AWGN) is a fundamental and well-studied problem in signal processing and communications. A variety of approaches to this problem, distinguished primarily by estimation accuracy, computational complexity, and processing latency, have been developed. One class of approaches is based on the Fast Fourier Transform (FFT) due to its connections with the maximum likelihood estimator (MLE) of frequency. This thesis compares several FFT-based approaches to the MLE in terms of their estimation accuracy a

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22

Hu, Jingying Ph D. Massachusetts Institute of Technology. "Design of low-voltage, high-bandwidth radio frequency power converters." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/75637.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 158-166).<br>The mass and volume required for power electronics circuitry is a dominant obstacle to the miniaturization and integration of many systems. Likewise, power electronics with greater bandwidth and efficiency are becoming vital in many applications. To realize smaller and highly responsive power electronics at low voltages, this thesis explores devices, circuits, and passives capable of

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23

Chorowski, Jakub. "Statistics for diffusion processes with low and high-frequency observations." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17652.

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Diese Dissertation betrachtet das Problem der nichtparametrischen Schätzung der Diffusionskoeffizienten eines ein-dimensionalen und zeitlich homogenen Itô-Diffusionsprozesses. Dabei werden verschiedene diskrete Sampling Regimes untersucht. Im ersten Teil zeigen wir, dass eine Variante des von Gobet, Hoffmann und Reiß konstruierten Niedrigfrequenz-Schätzers auch im Fall von zufälligen Beobachtungszeiten verwendet werden kann. Wir beweisen, dass der Schätzer optimal im Minimaxsinn und adaptiv bezüglich der Verteilung der Beobachtungszeiten ist. Außerdam wenden wir die Lepski Methode an um ei

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24

Guo, Shuibao. "High performance digital controller for high-frequency low-power integrated DC/DC SMPS." Lyon, INSA, 2009. http://theses.insa-lyon.fr/publication/2009ISAL0033/these.pdf.

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Bien qu'un sujet de recherché important, le contrôle numérique n'a pas encore été appliqué en pratique aux convertisseurs de tension à découpage basse-puissance. Les appareils portables sont encore conçus avec des convertisseurs de tension à boucle de contrôle analogique. Ceci est dû à la complexité de l'implémentation d'un contrôleur numérique, aux contraintes de coût et l'absente d'architecture de contrôleur ayant prouvé leur efficacité pour de hautes fréquences de découpage. Les compromis entre performances, consommation, coût silicium limitent encore le développement des contrôleurs numéri

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25

Dai, Ning. "Modeling, analysis, and design of high-frequency high-density low-profile power transformers." Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-06062008-151512/.

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26

Dalal, Milap. "Low noise, low power interface circuits and systems for high frequency resonant micro-gyroscopes." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44861.

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Today's state-of-the-art rate vibratory gyroscopes use a large proof mass that vibrates at a low resonance frequency (3-30 kHz), a condition that creates a performance tradeoff in which the gyroscope can either offer large bandwidth or high resolution, but not both. This tradeoff led to the development of the capacitive bulk acoustic wave (BAW) silicon disk gyroscope, a new class of micromachined rate vibratory gyroscopes operating in the frequency range of 1-10MHz with high device bandwidth and shock/vibration tolerance. By scaling the frequency, BAW gyroscopes can provide low mechanical no

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27

Merlini, Adrien. "Unified computational frameworks bridging low to high frequency simulations : fast and high fidelity modelling from brain to radio-frequency scenarios." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2019. http://www.theses.fr/2019IMTA0130/document.

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Dans le domaine de l’électromagnétisme computationnel, les équations intégrales de frontière sont très largement utilisées pour résoudre certains des plus grands problèmes directs, grâce à leur grande efficacité. Cependant les équations intégrales du champ électrique et du champ combiné (EFIE et CFIE), deux des formulations les plus employées, souffrent d’instabilités à basse fréquence et à haute discrétisation, ce qui limite leur versatilité. Dans cette thèse différentes approches sont présentées pour obtenir des algorithmes applicables aussi bien à des problèmes de compatibilité électromagné

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28

Tsang, Tommy 1977. "The design of low-voltage high frequency CMOS low noise amplifiers for future wireless applications /." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33998.

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RFIC's are traditionally implemented in III--V compounded semiconductors or in bipolar technologies, due to their superior RF performances (e.g. low noise) when compared to CMOS technologies. The challenges are not only to design RF transceivers in standard CMOS processes, but also to establish design methodologies and optimization techniques for their building blocks.<br>This thesis is concerned with one of the key building blocks, namely the Low Noise Amplifier (LNA). Several low-voltage LNA's were successfully implemented in a standard 0.18 mum CMOS technology, operating in the 5--9 GHz fre

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29

Swaminathan, Ashok. "Enabling techniques for low power, high performance fractional-N frequency synthesizers." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3222048.

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Thesis (Ph. D.)--University of California, San Diego, 2006.<br>Title from first page of PDF file (viewed September 20, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.

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30

Belcher, Robert W. "Extremely High Frequency (EHF) Low Probability of Intercept (LPI) communication applications." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA226653.

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Thesis (M.S. in Telecommunications Systems Management)--Naval Postgraduate School, March 1990.<br>Thesis Advisor(s): Schwendtner, Thomas A. Second Reader: Davidson, K. L. "March 1990." Description based on title screen as viewed on August 25, 2009. DTIC Descriptor(s): Interception probabilities, communication and radio systems, communications networks, spectra, command and control systems, extremely high frequency, naval operations, tactical warfare, low rate, theses, scenarios, line of sight, military applications. Author(s) subject terms: Millimeter wave, EHF, Extremely High Frequency, LPI,

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31

Shin, Jaemin. "Rapid, Predictive Modeling for High Frequency Interconnect on Low Cost Substrates." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7108.

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In this dissertation, a predictive (scalable) measurement-based PEEC modeling method for high-frequency interconnects on low-cost FR4 substrates is proposed and demonstrated. The interconnects are modeled with equivalent circuits of scalable building blocks using a rapid and accurate optimization method to fit parameter data up to 10 GHz. The predictive power of the developed scalable models is demonstrated in several extended interconnect structures and the ability to use interpolation to predict the high frequency performance of structures with differently sized building blocks is demonstrat

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32

Mostafa, Ahmed. "The design of low-voltage high-frequency CMOS LC-based oscillators /." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33982.

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With the rapidly accelerating world of communications, there has been an increased interest in monolithic integration. CMOS technology has become a natural candidate for system integration being the technology of choice for digital circuit implementation.<br>This thesis presents several LC-based CMOS voltage controlled oscillators, demonstrating the capability and benefits of the technology in high-frequency designs. Through optimization of a simple LC oscillator, a 4 GHz circuit operating at a supply voltage as low as 0.85 V was implemented and measured. Optimization of a symmetric LC oscilla

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33

Cleaver, David. "Low Reynolds number flow control through small-amplitude high-frequency motion." Thesis, University of Bath, 2011. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547620.

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There is currently growing interest in the field of Micro Air Vehicles (MAVs). A MAV is characterized by its low Reynolds numbers flight regime which makes lift and thrust creation a significant challenge. One possible solution inspired by nature is flapping flight, but instead of the large-amplitude low-frequency motion suited to the muscular actuators of nature, small-amplitude high-frequency motion may be more suitable for electrical actuators. In this thesis the effect of small-amplitude high-frequency motion is experimentally investigated focusing on three aspects: general performance imp

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34

Wang, Kefei. "Parameter Estimation of a High Frequency Cascode Low Noise Amplifier Model." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-theses/1053.

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"A Low Noise Amplifier (LNA) is an important building block in the RF receiver chain. Typically the LNA should provide acceptable gain and high linearity while maintaining low noise and power consumption. To optimize these conflicting goals the so-called Cascode topology is widely used in industry. Here the gain cell is comprised of two transistors, one in common-source and the other in common gate configuration. Cascode has a number of competitive advantages over other topologies such as high output impedance that shields the input device from voltage variations at the output, good reverse

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35

Jiang, D. "Design techniques for low-noise, high-speed fractional-N frequency synthesisers." Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/17932/.

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This thesis presents techniques for designing fractional-N synthesisers which achieve both low phase noise and high loop bandwidth simultaneously. The objective is to provide a single-loop synthesiser solution that satisfies the requirements on both the phase noise level and frequency switching speed specified by wireless standards. The GSM 900 standard is used as the bench- mark in this work but these techniques can also be applied to synthesisers for other wireless applications. A linearised synthesiser phase noise model is proposed for evaluating the proposed techniques. The model is constr

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36

Li, Qiang. "Low-Profile Magnetic Integration for High-Frequency Point-of-Load Converter." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/28637.

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Today, every microprocessor is powered with a Voltage Regulator (VR), which is also known as a high current Point-of-Load converter (POL). These circuits are mostly constructed using discrete components, and populated on the motherboard. With this solution, the passive components such as inductors and capacitors are bulky. They occupy a considerable footprint on the motherboard. The problem is exacerbated with the current trend of reducing the size of all forms of portable computing equipment from laptop to netbook, increasing functionalities of PDA and smart phones. In order to solve this pro

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Zhang, Ningjiao. "Low Frequency Noise Characterization of AlGaN/GaN High Electron Mobility Transistors." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366369049.

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38

Oliver, Trevor N. "Surface acoustic wave devices with low loss and high frequency operation." Thesis, Aston University, 1989. http://publications.aston.ac.uk/8083/.

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This thesis describes an industrial research project carried out in collaboration with STC Components, Harlow, Essex. Technical and market trends in the use of surface acoustic wave (SAW) devices are reviewed. As a result, three areas not previously addressed by STC were identified: lower insertion loss designs, higher operating frequencies and improved temperature dependent stability. A review of the temperature performance of alternative lower insertion loss designs,shows that greater use could be made of the on-site quartz growing plant. Data is presented for quartz cuts in the ST-AT range.

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Çoban, Abdulkerim Levent. "A low-voltage high-resolution audio delta-sigma modulator." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15514.

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Lieu, Anthony D. "A New Architecture For Low-Voltage Low-Phase-Noise High-Frequency CMOS LC Voltage-Controlled Oscillator." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7109.

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Presented in this work is a novel design technique for a low-phase-noise high-frequency CMOS voltage-controlled oscillator. Phase noise is generated from electrical noise near DC, the oscillation frequency, and its harmonics. In CMOS technology, low-frequency flicker noise dominates the close-in phase noise of the VCO. The proposed technique minimizes the VCO phase noise by seeking to eliminate the effect of flicker noise on the phase noise. This is accomplished by canceling out the DC component of the impulse sensitivity function (ISF) corresponding to each flicker-noise source, thus prev

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Murnane, Owen D., and John K. Kelly. "The Effects of High-Frequency Hearing Loss on Low-Frequency Components of the Click-Evoked Otoacoustic Emission." Digital Commons @ East Tennessee State University, 2003. https://dc.etsu.edu/etsu-works/1791.

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Click-evoked otoacoustic emission (CEOAE) input/output (I/O) functions were measured in ears with normal hearing and in ears with sensorineural hearing loss above 2000 Hz. The low- to midfrequency CEOAEs obtained from the ears with high-frequency hearing loss were significantly reduced in level compared to the CEOAEs obtained from the ears with normal hearing even though there were no significant group differences in the 250-2000 Hz pure-tone thresholds. The findings are discussed within the context of two hypotheses that explain the low- to midfrequency reduction in transient-evoked otoacoust

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Drexler, Josef. "Determining the properties of low-frequency Farley-Buneman waves at high latitudes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ58028.pdf.

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43

Li, Weilai. "High efficiency wireless power transmission at low frequency using permanent magnet coupling." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/12599.

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A new method of electrical wireless power transfer has been parameterized and experimentally verified for a variety of size-scales and applications. The main distinction between this and previous methods of wireless power transfer is the nature of the coupling mechanism, which is a magnetic interaction between synchronized, rotating, permanent magnets. Its main components can be viewed as equivalent to an electric motor, a magnetic gear, and an electric generator. Its performance parameters such as power, range and efficiency are within the same order of magnitude as previously known resonant

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Theodosiou, Marina. "Aspects of modelling low and high frequency financial and economic time series." Thesis, Imperial College London, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.534969.

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Meyer, Patrik K. (Patrik Kristof). "The impact of high frequency/low energy seismic waves on unreinforced masonry." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38557.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2006.<br>Includes bibliographical references (p. [85]-87).<br>Traditionally, the high frequency components of earthquake loading are disregarded as a source of structural damage because of their small energy content and because their frequency is too high to resonate with the natural frequencies of structures. This thesis argues that higher frequency waves travelling through stiff masonry structures can trigger two types of failure mechanisms that have not yet been taken into account. First, the

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Olyaei, Maryam. "Low-frequency noise in high-k gate stacks with interfacial layer engineering." Doctoral thesis, KTH, Integrerade komponenter och kretsar, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177911.

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The rapid progress of complementary-metal-oxide-semiconductor (CMOS) integrated circuit technology became feasible through continuous device scaling. The implementation of high-k/metal gates had a significantcontribution to this progress during the last decade. However, there are still challenges regarding the reliability of these devices. One of the main issues is the escalating 1/fnoise level, which leads to degradation of signal-to-noise ratio (SNR) in electronic circuits. The focus of this thesis is on low-frequency noise characterization and modeling of various novel CMOS devices. The dev

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Wen, Chien-Hui. "High Birefringence and Low Viscosity Liquid Crystals." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3206.

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In this dissertation, liquid crystal (LC) materials and devices are investigated in order to meet the challenges for photonics and displays applications. We have studied three kinds of liquid crystal materials: positive dielectric anisotropic LCs, negative dielectric anisotropic LCs, and dual- frequency LCs. For the positive dielectric anisotropic LCs, we have developed some high birefringence isothiocyanato tolane LC compounds with birefringence ~0.4, and super high birefringence isothiocyanato biphenyl-bistolane LC compounds with birefringence as high as ~0.7. Moreover, we have studied the p

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48

Hou, Dongbin. "Very High Frequency Integrated POL for CPUs." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/77608.

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Point-of-load (POL) converters are used extensively in IT products. Every piece of the integrated circuit (IC) is powered by a point-of-load (POL) converter, where the proximity of the power supply to the load is very critical in terms of transient performance and efficiency. A compact POL converter with high power density is desired because of current trends toward reducing the size and increasing functionalities of all forms of IT products and portable electronics. To improve the power density, a 3D integrated POL module has been successfully demonstrated at the Center for Power Electronic S

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49

Mishra, Chinmaya. "Design and implementation of low power multistage amplifiers and high frequency distributed amplifiers." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2775.

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The advancement in integrated circuit (IC) technology has resulted in scaling down of device sizes and supply voltages without proportionally scaling down the threshold voltage of the MOS transistor. This, coupled with the increasing demand for low power, portable, battery-operated electronic devices, like mobile phones, and laptops provides the impetus for further research towards achieving higher integration on chip and low power consumption. High gain, wide bandwidth amplifiers driving large capacitive loads serve as error amplifiers in low-voltage low drop out regulators in portable device

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50

Xiong, Zhijie. "Radio Frequency Low Noise and High Q Integrated Filters in Digital CMOS Processes." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5043.

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Radio Frequency Low Noise and High Q Integrated Filters in Digital CMOS Processes Zhijie Xiong 149 pages Directed by Dr. Phillip E. Allen Presented in this work is a novel design technique for CMOS integration of RF high Q integrated filters using positive feedback and current mode approach. Two circuits are designed in this work: a 100MHz low-noise and high Q bandpass filter suited for an FM radio front-end, and a 2.4GHz low-noise and high-Q bandpass filter suited for a Bluetooth front-end. Current-mode approach and positive feedback design techniques are successfully used in the design o

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