Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 84 for “"Frequency Noise"”.
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Characterization and modeling of low-frequency noise in MOSFETs
… technology has brought more issues in terms of noise. The noise cannot be completely eliminated and will therefore ultimately limit the accuracy of measurements and set a lower limit on how small signals can be detected and processed in an electronic circuit. One kind of noise which affects MOS …
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Low Frequency Noise in Semiconductors and Metals (Statistics, Gaussian (Noise)
Properties of l/f noise (low frequency resistance fluctuations) are analyzed using the results of a number of experiments, several of which are unique to our laboratory. Measurements of thermally activated noise spectral features, as well as the effect of a surface potential of the noise kinetics …
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Low Frequency Noise Reduction Using Novel Poro-Elastic Acoustic Metamaterials
Low frequency noise is a common problem in aircraft and launch vehicles. New technologies must be investigated to reduce this noise while contributing minimal weight to the structure. This thesis investigates passive and active control methods to improve low frequency sound absorption and …
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Characterization and Modeling of Low Frequency Noise and Dielectric Traps in Scaled MOSFET Devices
… develop a quantum mechanical treatment of low-frequency noise to extend the ``unified'' noise model and includes remote Coulomb scattering and surface roughness - the latter is a new consideration in the theory. Our experimental work focuses on scaled NMOS devices with a composite dielectric …
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Fluctuations in dc SQUIDs: Quantum Noise Effects, Low Frequency Noise, and Single Electron Trapping
We have studied the signal and noise properties of extremely sensitive dc SQUIDs composed of submicron area tunnel junctions. At high frequencies, the flux resolution is expected to be limited by intrinsic quantum fluctuations, making these devices prime candidates for ideal quantum-limited …
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Fluctuations in dc SQUIDs: Quantum Noise Effects, Low Frequency Noise, and Single Electron Trapping
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-20T14:25:06Z No. of bitstreams: 1 1987_wakai.pdf: 3819337 bytes, checksum: a5d33ec70db1b29e666efe334b7fae0e (MD5)
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An Analytical Study of the Weak Radiating Cell as a Passive Low Frequency Noise Control Device
At low frequency where the acoustic wavelength is greater than the size of the vibrating structure, the radiated acoustic power is directly related to the volume velocity of the structure. Thus, minimizing the volume velocity is an effective noise reduction approach for low frequency structurally …
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Characterization and modeling of low-frequency noise in Hf-based high -kappa dielectrics for future cmos applications
… For analog and mixed-signal applications, low-frequency (I /f~ noise is a major reliability factor. Also in recent years. low frequency noise diagnostics has become a powerful tool for device performance and reliability characterization. This dissertation work demonstrates the necessity of gate …
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Investigation of Degradation Effects Due to Gate Stress in GaN-on-Si High Electron Mobility Transistors Through Analysis of Low Frequency Noise
… have higher electron mobility crucial for high frequency operation. However, over time and use these devices degrade in a manner that is not well understood. This research utilizes low frequency noise (LFN) as a method for analyzing changes and degradation mechanisms in GaN-on-Si devices due to …
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FABRICATION AND CHARACTERIZATION OF ACTIVE NANOSTRUCTURES
… are also presented. The levels and origin of low-frequency noise in junctionless transistor devices fabricated from silicon nanowires and also from GeOI devices are reported. Low-frequency noise is an indicator of the quality of the material, hence its characterization can reveal the quality and …
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A MEMS-based precision operational amplifier
… precision DC measurements are the inherent low-frequency noise of the amplifier and the leakage current of the amplifier input stage. This thesis presents a novel fully integrated operational amplifier design that addresses both measurement limitations by using a fully differential mechanical …
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Noise detection and transport measurements of spin valve systems.
Electronic noise not only limits the performance of magnetic devices in practical applications but also provides valuable physical insights into these devices. The first part of this thesis discusses how the low frequency noise in magnetic tunnel junctions and giant magnetoresistance devices can be …
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Coherence characterization with a superconducting flux qubit through NMR approaches
… time. This technique is further utilized as a noise spectrum analyzer in the megahertz range, by which a 1/f-type dependence is observed for the flux noise. Then, a novel method of performing low-frequency noise spectroscopy is developed and successfully implemented. New techniques used in the …
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Intensity noise suppression using a semiconductor optical amplifier: characterisations and applications
… system-level study of the intensity noise suppression offered by a saturated semiconductor optical amplifier (SOA), and its application to high channel count spectrum-sliced and optical code division multiplexed (OCDMA) systems incorporating low-cost incoherent light sources. …
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Percolation and nanosecond fluctuators in V2O3 films within the metal-insulator transition
… range of phase coexistence. Resistive noise measured through electronic transport is a probe of percolation and the fluctuating dynamics of the two-phase domain structure. We measure voltage noise spectra at both low frequencies (up to 100 kHz) and radio frequencies (between 10 MHz and …
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Low frequency critical current noise and two level system defects in Josephson junctions
… Josephson junction is known to exhibit a 1/f low frequency noise. Implemented as a superconducting qubit, this low frequency noise can lead to decoherence. While the 1/f noise has been known to arise from an ensemble of two level systems connected to the tunnel barrier, the precise microscopic …
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Aeroacoustic control of landing gear noise using perforated fairings
… of perforated fairings for landing gear noise control. The sparse knowledge about this new subject has necessitated a more fundamental study involving a basic fairing-strut configuration, followed by wind tunnel tests on a simplified landing gear configuration incorporating perforated …
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Ultra-low noise and low temperature drift power supply system design for RF applications
This thesis started off with an investigation of noise performance of bench power supplies and existing commercial off-the-self Low Drop Out (LDO) regulators used as power sources in radio frequency applications. Noise of power supply contributes to the phase noise of RF transceivers. The …
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