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.
Results
Showing 1 to 20 of 53 for “"gigahertz"”.
-
A piezo-tunable gigahertz cavity microelectromechanical resonator
RF systems need high-frequency widely-tunable high-Q bandpass filters for channel selection filters and local oscillators. This thesis describes the design, fabrication and testing of a electromagnetic cavity resonator designed for such applications. Alternative technologies provide wide tuning or …
-
Reducing extrinsic damping of surface acoustic waves at gigahertz frequencies
High-frequency surface acoustic waves (SAWs) in the GHz range can be generated using absorption from an ultrafast laser in a patterned metallic grating on a substrate. Reducing the attenuation at these frequencies can yield better sensors as well as enable them to better probe phonon and …
-
Gigahertz-Range Multiplier Architectures Using MOS Current Mode Logic (MCML)
… among speed, power dissipation and area. With gigahertz range microprocessors becoming commonplace, it is a typical design requirement to push the speed to its extreme while minimizing power dissipation and die area. Multipliers are critical components of many computational intensive circuits …
-
Methods for extending high-performance automated test equipment (ATE) using multi-gigahertz FPGA technologies
… Automated Test Equipment (ATE) using Multi-Gigahertz FPGA Technologies Ashraf M. Majid 264 Pages Directed by Dr. David Keezer This thesis presents methods for developing multi-function, multi-GHz, FPGAbased test modules designed to enhance the performance capabilities of automated test …
-
Electric field emissions of FPGA chip based on gigahertz transverse electromagnetic cell modeling and measurements
… to comply with EMC tests at the product level. A Gigahertz Transverse Electromagnetic (GTEM) cell is a common test instrument used to measure IC radiated emission and the test cost is relatively low. Regular IC radiated emission measurements using GTEM tend to neglect some significant emission …
-
Non-destructively detecting spinodal decomposition at a distance towards developing gigahertz ultrasonics for in-vessel inspection
… 10-CFR-50.65. Here we demonstrate the use of gigahertz, non-contact ultrasonics to gauge the state of cast austenitic stainless steels (CASS), used in some of the largest components in LWR primary systems. We do so by linking changes in their surface acoustic wave (SAW) characteristics using …
-
Ultrafast photo-acoustic spectroscopy of super-cooled liquids
… and transverse acoustic waves in liquids at gigahertz frequencies. The experimental effort was designed for the study of supercooled liquids whose slower relaxation dynamics extend to gigahertz frequencies at high temperatures and whose faster dynamics are centered uniquely in the gigahertz …
-
Efficiency enhancement techniques for RF and millimeter wave power amplifiers
… an energy recycling network operating at multi-gigahertz frequencies. The resistance compression network reduces the variation in resonant rectifier input impedance seen at the isolation port of an isolating power combiner. The system was operated at 2.14 GHz and was built around Schottky …
-
Modeling and simulation of surface mount packages
… in this work are packages for use in the gigahertz range. In order to accurately model these packages, time and frequency domain measurements of two different packaged structures are performed. Equivalent electrical circuit models for the structures are then derived and compared with …
-
Modeling of mechanical energy dissipation of low-dimensional resonators
… thickness, sub-micron dimension, and mega- to gigahertz frequencies of these resonators, nano-scale physical processes start becoming important. Most macroscale models do not account for these physical processes, warranting the current line of research. In this thesis, we use atomistic …
-
Signal Encoding and Digital Signal Processing in Continuous Time
… encoding of CT DSPs for signals in the lower gigahertz frequency range are investigated, with consideration of speed and accuracy limitations in the context of submicron CMOS technologies. A per-edge digital signal encoding technique is developed, which bypasses timing problems of processing …
-
High repetition rate fiber lasers
… low noise fiber laser sources operating at multi-gigahertz repetition rates are developed systematically. A 200 MHz fundamentally mode-locked soliton laser and a 200 MHz fundamentally mode-locked similariton laser are first developed. Intra-cavity soliton formation is recognized as the optimum …
-
Quantifying communication device vulnerabilities: assessing energy requirements through front door and back door coupling
… back door setups, the DUT was placed inside a Gigahertz Transverse Electromagnetic (GTEM) device and exposed to incoming propagating HPEM signals. Subsequently, the findings from direct injection tests were compared back to results gained from free-field testing to verify the accuracy of both …
-
The use of loop mirrors and chirped fibre Bragg gratings in actively-modelocked fibre lasers
… grating.Systems operating both at 76MHz and gigahertz frequencies are presented, the latter using a semiconductor laser amplifier to enhance nonlinear action in the loop mirror. A novel dual-wavelength system in which two linear cavities share a common modulator is presented with results …
-
Materials and devices for optical switching and modulation of photonic integrated circuits
… the switch speed with speeds in excess of gigahertz rates with minimal device footprint. Fundamental material transport properties and nonstoichiometry in VO2 were characterized. Nonstoichiometry as high as 5% was measured. A Frenkel defect model was used to describe the behavior in V02 in …
-
Characterization of Magic-angle Twisted Bilayer Graphene using Microwave Techniques
… experimental method to characterize MATBG in the gigahertz-frequency regime, the operating regime of superconducting qubits. A hybrid on-chip DC-microwave circuit, which integrates a DC four-probe measurement and microwave resonator readout functionalities, enables the investigation of DC …
-
Full-wave analysis of large conductor systems over substrate
… circuit clock frequencies rise into the multiple gigahertz range. In this thesis, a simulation tool is presented for the extraction of full-wave interconnect impedances in the presence of a conducting substrate. The substrate effects are accounted for through the use of full-wave layered Green's …
-
Ultrawideband Channel Sounding Studies in Outdoor and Outdoor-Indoor Environments
… UWB pulse, which can be of the order of a few gigahertz in bandwidth. The aim of the thesis is to provide the parameters needed in order to develop a channel model for such cases. The channel model would then play an important role in determining physical layer (PHY) solutions to optimally …
-
Particle shape corrections to Twersky's formalism for multiple scattering in a random particulate medium
… Current research is aimed at high frequencies (gigahertz to terahertz). At these frequencies, multiple scattering effects become very important since the wavelength reduces to the size of a particle. The purpose of this thesis is to augment the Twersky theory of multiple scattering in a random …
Page 1 of 3