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 406 for “"output power"”.
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Output power increase at idle speed in alternators
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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Investigation of multiple-input single-output power conversion for advanced solar cell systems
… but require sophisticated interconnection and power conversion. Different topologies for a cell block interconnection were investigated and equations providing the estimated losses in those topologies were derived. The interconnected cell block is used as an input to the Multiple-Input …
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Null Depth Trade Off for Output Power Reduction in a Downlink Adaptive Antenna Array
… However, downlink adaptive arrays use additional power when they are required to include null steering in their beam patterns. This excessive transmitted power reduces the effective antenna gain, increases interference in other directions and has implications on the dimensioning of the power …
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Real time power control strategy for output power for single phase inverter-linear load
Power electronics have been widely used in many applications due to its reliability in controller. This project is to describe and test the real time power control strategy for output power for inverter-linear load connection. The current control strategy was adapted in controlling the output power …
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Design and Construction of 1800W Modular Multiple Input Single Output Non-isolated DC-DC Converters
… converters to create a Multiple Input Single Output (MISO) converter for combining multiple renewable energy sources into one single output. This MISO uses the four-switch buck-boost topology to output a single 48V from multiple nominal 24V inputs. The MISO converter implements a modular …
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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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A FIR Filter Embedded Millimeter-wave Front-end for High Frequency Selectivity
… channel 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 …
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Power scaling of Tm:YLF-pumped Ho:YAG lasers
Reported in this thesis are methodologies for power-scaling Ho:YAG lasers for both the continuous-wave (CW) and Q-switched regime. Advancement in Ho:YAG laser power is made possible through the improvements in output power of the Tm:YLF pump lasers. The slab geometry provides good thermal …
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Signal generation for millimeter wave and THz applications in InP-DHBT and InP-on-BiCMOS technologies
… fulfill the demands due to their limitations in power-handling capability with increasing device speed. III-V technologies offer a higher potential in this regard, but do not allow high levels of integration. In order to move beyond silicon-based technologies while still providing high level of …
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Design and characterization of a radio-frequency dc/dc power converter
… (RF) amplifier topologies in dc/dc power converters allows the operating frequency to be increased by more than two orders of magnitude over the frequency of conventional converters. This enables a reduction in energy storage capacity by several orders of magnitude, and completely …
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A 250 GHz photonic band gap gyrotron amplifier
… of the amplifier at peak gain is 0.4 GHz. A peak output power of 45 W has been measured. The output power is not saturated but is limited by the 7.5 mW of available input power. The amplifier can be tuned for operation from 245- 256 GHz. With a gain of 24 dB and centered at 253.25 GHz the widest …
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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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STIMULATED BRILLOUIN SCATTERING SUPPRESSION VIA TEMPERATURE GRADIENTS IN FIBER AMPLIFIERS
A method of improving the output power of a 177W narrow linewidth polarization maintaining ytterbium doped fiber amplifier is explored. The limiting factor, Stimulated Brillouin Scattering (SBS), is suppressed with a single-step temperature gradient. A similar fiber amplifier to the 177W amplifier …
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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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Power and energy storage requirements for ship integration of solid-state lasers on naval platforms
… Due to the amount of energy required to power these laser weapons systems and the limited amount of available energy onboard ships, different energy storage systems need to be explored. For this research, two locations were studied: the coast of Cuba and the coast of Russia. These two …
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Theory of Operating Characteristics of Quantum Dot Lasers with Asymmetric Barrier Layers
… operating characteristics, limiting the maximum output power and modulation bandwidth. Three separate cases are considered: only indirect capture with electron-hole symmetry, both direct and indirect capture with electron-hole symmetry, and both direct and indirect capture of electrons but only …
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A smart motor drive system for domestic and industrial applications
… is required to operate in the so-called constant power region. Constant power, when referred to an electrical motor, is characterised by a constant mechanical output power of the motor at any rated torque and speed. The mechanical output power of a motor is the product of its torque and speed. For …
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Current-Source DC-DC Converter for Fiber-Optic Communication Systems
… concept for a current-source DC-DC converter for powering sensors used in an underwater communications system is presented. The proposed converter steps down an input current of 0.9 A to 0.625 A, while maintaining an output voltage of 24 V and output power of 15 W. The complete steady-state …
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