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 202 for “"Power efficiency"”.
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Power efficiency analysis for an Active structure
Methods for analyzing the structural-acoustic power efficiency of active structures are developed. For this work we define the power efficiency as the ratio of the sound power radiated by a structure to the maximum possible radiated sound power. An active structure is defined as one that has …
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A Smart Implementation of Turbo Decoding for Improved Power Efficiency
… through a noisy channel. Turbo codes are a very powerful form of error correction codes that bring the performance of practical coding even closer to Shannon's theoretical specifications. Bit-error-rate (BER) performance and power dissipation are two important measures of performance used to …
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Mitigating variability in HPC systems and applications for performance and power efficiency
Power consumption and process variability are two important, interconnected, challenges of future generation large-scale High Performance Computing (HPC) data centers. For example, current production petaflop supercomputers consume more than 10 megawatts of machine and cooling power that costs …
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A class-D-tracking-rail class-A audio power amplifier
A tracking-rail power audio amplifier was designed and partially implemented to deliver up to 100W into an 8Q load with very low signal distortion and high power efficiency. The design uses a class-A amplifier, known for its low signal distortion but low power efficiency (less than 50%), to amplify …
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0.3V biopotential sensor interface for stress monitoring
Miniaturized sensor nodes have a very tight power budget, especially in the case of implantables and health monitoring devices that require long operation lifetime. Exploiting low-voltage techniques in analog design can enable further power savings, which has not been explored much. However, for …
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Geometrically Programmed Nano-Resistors for Ultra-Robust Artificial Neural Network Accelerator
… hardware have not matched the speed and power-efficiency requirement, restricting the realization of the full potential of AI and requiring innovation in AI hardware. Data transmission bottleneck between memory and processor has been pointed out as main source of poor computing speed and …
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Lower power RF transceiver modeling and design for wireless microsensor networks
… networks, the RF transceiver dominates the power consumption. The concept of transceiver power efficiency is introduced, which defines the ratio of RF transmit power to transceiver electronics power, to show that short-range RF transceivers have low transceiver power efficiency. A system …
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Magnetoelectric Laminates with Novel Properties for Sensor, Transmitter, and Gyrator Applications
… (ME) effect is a property that results in power/energy conversion between magnetic and electric forms. Two-phase composites consisting of magnetostrictive and piezoelectric materials have been developed that show remarkable ME voltage/charge coefficients. This extrinsic ME effect is …
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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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A Distortion Suppression Technique for a Digital Class D Audio Power Amplifier with Pulse Density Modulation
… demands for high sound quality and improved power efficiency. Low power audio amplifiers for mobile phones and MP3 players, and high power amplifiers for portable speakers require high power efficiency and superior audio quality. The compact design of portable electronics has also increased …
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Singlet exciton fission : applications to solar energy harvesting
… photons increasing the maximum theoretical power efficiency to greater than 40%. The steady state singlet fission rate can be perturbed under an external magnetic field. I utilize this effect to monitor the yield of singlet fission within operating solar cells. Singlet fission approaches …
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Optimizing Reservoir Computing Architecture for Dynamic Spectrum Sensing Applications
… neural networks, such as low complexity, high power efficiency, and accuracy, surpass those of traditional deep learning and conventional spectrum sensing methods. The architecture of the liquid state machine processor and its training methods are crucial for the performance of an LSM …
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EFFECTS OF GATE THICKNESS, GATE MORPHOLOGY, AND EMISSIVE MATERIAL ON ORGANIC LIGHT EMITTING VARACTOR CAPACITOR PERFORMANCE
To keep up with the demands of power efficiency and broadened applicability, new lighting technologies must be invented. Organic light emitting varactors (OLEVs) represent a promising future in this regard and are explored here. OLEVs are built similarly to OLEDs, with an added gate. Under AC …
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On-chip current sensing for monolithic buck LED driver
… while maintaining output current accuracy and power efficiency.
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Analysis of low voltage regulator efficiency based on ferrite inductor
… buck converter (i.e., low voltage regulator) for power efficiency and percentage ripple reduction at frequencies between 1 and 10 MHz with variable loads from 0.024 to 4 ohms. The parameters, such as inductance of 20 nH, quality factor of 15 of fabricated ferrite inductor and DC resistance (DCR) …
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Adaptive primary side control for a wireless power transfer optimization
A resonant inductive wireless power transfer system, consisting of a primary (transmitter) circuit and secondary (receiver) circuit, was designed and implemented. This document also contains a novel indirect feedback method to optimize the power efficiency of a wireless transfer system. The …
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Probabilistic approaches to the design of wireless ad hoc and sensor networks
… demands in application, such as reliability, power efficiency and sensor deployment, of wireless ad hoc and sensor network can be improved by mobility estimation and/or prediction. In this dissertation, we study several random mobility models, present a mobility prediction methodology, which …
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Design and Optimization of Physical Waveform-Diverse and Spatially-Diverse Radar Emissions
… as constant amplitude (to maintain sufficient power efficiency) and continuous phase (for spectral containment) are still considered prerequisites for high-powered radar waveforms. These criteria are also applicable to the design of multiple waveforms emitted from an antenna array in a …
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Forecasting Wind Direction Across Very Short and Short Term Time Horizons for Wind Turbine Control
Wind energy systems will require improved efficiency to meet future electricity demands in alignment with net-zero goals. Wind turbine yaw control systems can provide incremental improvements in power efficiency across both individual turbines and the collective wind farm. Yaw control strategies …
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