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 19 of 19 for “"Power Combining"”.
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AC Power Combining Strategy with Application to Efficient Linear Power Amplifiers
… (OFDM), suffer from high peak to average power ratios. Standard Class A and Class AB amplifiers cannot simultaneously achieve good linearity and efficiency, and therefore there has been an increase in the development of new topologies to combat this issue. Common features to these circuits …
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Lossless multi-way power combining and outphasing for radio frequency power amplifiers
For applications requiring the use of power amplifiers (PAs) operating at high frequencies and power levels, it is often preferable to construct multiple low power PAs and combine their output powers to form a high-power PA. Moreover, such PAs must often be able to provide dynamic control of their …
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Network lifetime extension, power conservation and interference suppression for next generation mobile wireless networks
… against undesired interference of unknown power, while preserving simple design, with closed-form solution for error probabilities. It is shown that these detectors are linearly optimal, if the interference power is unknown. In the area of network lifetime extension, a new approach to …
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Advancing the Performance of a Switched-Mode Radio Frequency Power Generation Architecture
… of a recently proposed switched-mode power generation architecture - the Multi-Inverter Discrete Backoff (MIDB) system - that is currently in development. The RF power system is intended to be used in applications such as radio frequency plasma generation for semiconductor fabrication. …
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A digital signal processing solution for multichannel base stations
… Current base station architectures use analogue combining techniques which are expensive, voluminous and inflexible. This thesis investigates a Digital Signal Processing (DSP) solution which produces a cheaper, smaller and more flexible multichannel base station transmitter design. The main …
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A 2-D Scalable Third harmonic radiator at 291.3 GHz with -2 dBm of Radiated Power in 22 nm FinFET Technology
… communications. However, the lack of high-power sources at this frequency range hinders the wide-scale adoption of these technologies commercially. This THz gap exists due to the inability of electronic and optical techniques to generate high power levels at this frequency range. Novel …
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Low loss microwave power combiners/dividers
… microwave solid state sources with output powers greater than that available from a single device a need for combining the power from these devices is required. N-way combiners/dividers may be used to achieve this. For high output powers these combiners/dividers must have a high combining …
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DESIGN OF DYNAMIC CAPACITIVE WIRELESS POWER TRANSFER SYSTEMS FOR ELECTRIC VEHICLE CHARGING
Dynamic wireless power transfer (WPT) systems can potentially accelerate the penetration of electric vehicles (EVs) in the market by enabling stationary, semi-dynamic, and dynamic charging, thereby reducing EV costs, eliminating charging time, and enabling unlimited range. Furthermore, dynamic WPT …
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Design and evaluation of a reconfigurable stacked active Bridge dc/dc converter for efficient wide load-range operation
… transformer. The converter can run in a low power mode that greatly increases light-load efficiency by reducing core loss and extending the zero-voltage switching (ZVS) range. The converter is implemented with a single compact magnetic component, providing power combining, isolation, and …
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3D Micromachined Passive Components and Active Circuit Integration for Millimeter-wave Radar Applications
… IC, and a series of V- and W-band corporate combining structures for use in transmitter power combining applications. The 94 GHz cavity-backed antennas based on a rectangular coaxial feeding network have been designed, fabricated, and tested. 13 dB gain for a 2 x 2 array, as well as antenna …
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Phase manipulation for efficient radio frequency transmission
Power amplifiers (PAs) for microwave communications are generally the most power-hungry element of a transmitter. High linearity is required for modern digital communications standards, and often is achieved at the expense of efficiency. Outphasing architectures, which combine multiple nonlinear …
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Parallel Fft-Accelerated Time-Domain Integral Equation Solvers for Electromagnetic Analysis
… circuits with nonlinear devices, including a power-combining array, and (iii) quantify system-level electromagnetic interference for systems with multiple scales of details, including an antenna array on a cockpit.
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Aren't Only Girls Secretaries…?”: Leadership Lessons From Women U.S. Secretaries of State
… dynamics and the pursuit of personal empowerment within institutional structures. Her story served as a testament to the importance of fostering strong relationships, maintaining loyalty, and navigating power dynamics skillfully to wield influence effectively in high-level governance. …
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RELATIVISTIC BACKWARD WAVE OSCILLATOR WITH A GAUSSIAN RADIATION PATTERN AND RELATED TECHNOLOGIES
Short pulse high power microwave (HPM) devices with Gaussian radiation pattern are attractive for many applications. The importance of the Gaussian microwave beam is that its maximum energy density is concentrated on axis. The purpose of this study is to use a backward wave oscillator (BWO), which …
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CMOS Power Device Modeling and Amplifier Circuits
A power amplifier (PA) is a key part of the RF front-end in transmitters for a local broadband network. Today, commercial PAs are made of III-V HEMT and HBT technology with excellent results. An integrated system-on-chip power amplifier circuit using CMOS technology for cost-effective and …
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Performance limits of RF power CMOS
… CMOS radios at 60 GHz. However, the design of power amplifiers in CMOS still remains a significant challenge because of the low breakdown voltage of deep submicron CMOS technologies. Power levels from 60 GHz power amplifiers have been limited to around 15 dBm with power-added efficiencies in …
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A FIR Filter Embedded Millimeter-wave Front-end for High Frequency Selectivity
… path loss is severe, demanding a high output power in transmitters (Tx) to meet a required SNR in receivers (Rx). Due to the intractable speed-power tradeoff ingrained in silicon processes, however, achieving a high power at mm-Wave, particularly over W-band (> 90 GHz), is challenging in …
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Genetic relatedness of Mycobacterium tuberculosis strains obtained from Kalafong Hospital in Pretoria using Spoligotyping and MIRU-VNTR typing
… genotyping due to its high discriminatory power. However, due to limitations, such as the requirement of large quantities of DNA, several polymerase chain reaction (PCR) based genotyping methods have been developed. These methods include spoligotyping and mycobacterial interspersed …
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Building a columnar database on shared main memory-based storage
… not only storage capacity, but also processing power. Combining both aspects allows pushing-down the execution of database operators into the storage system. We describe how the columnar data processed by AnalyticsDB is mapped to RAMCloud's key-value data model and how the performance advantages …