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 26 for “"burst-mode"”.
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Burst-mode electronic dispersion compensation in long reach PONs
… enhance the system performance at the expense of moderate additional implementation complexity. In order to use such EDC in LR-PON architectures, a number of challenges associated with the burst-mode nature of the upstream link need to be overcome. In particular, the EDC must be made adaptive from …
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Carrier phase and frequency estimation for burst-mode communications
… an even greater role when transmission is in burst mode. It is because that the receiver always asks for relock for separated burst, which transmits information from different users. Therefore, fast and efficient carrier synchronization schemes are highly needed. In the thesis, we studied …
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Spread spectrum modulation system for burst mode DC-DC converters
… system for DC-DC converters operating in burst mode. Burst mode DC-DC converters have high efficiency under low-power conditions in applications such as cell phones and notebook computers, but often produce noise in the audible range. This thesis explores a frequency modulation scheme and …
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Design of 10 Gb/s burst-mode receivers for high-split extended reach PONs
… dissertation describes the design of a 10 Gb/s burst-mode receiver for high-split extended reach passive optical networks (PONs). The designed receiver incorporates two very advanced features. Firstly, the burst-mode receiver locks its gain setting within 6 ns avoiding packet loss due to gain …
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Why do mosquitoes use two modes of drinking? An analytical test of a blockage clearing hypothesis
… drinking using synchrotron x-ray indicate two modes of drinking, a predominantly occurring continuous mode in which the anterior cibarial and posterior pharyngeal pumps expand cyclically at a constant phase difference and an isolated burst mode in which the pharyngeal pump expansion is several …
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Low-complexity structures for digital symbol timing recovery
… is perfectly applicable for continuous mode communication systems, however, the required long acquisition time, makes this feedback STR not suitable for short burst mode communication systems. The feedforward (FF) STR techniques, have very short acquisition time, thus they are the …
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Microcontroller (MCU) Based Simplified Optimal Trajectory Control (SOTC) for High-Frequency LLC Resonant Converters
… converter, including unpredictable dynamics, burst mode for light-load efficiency, soft start-up and short circuit protection. Additionally, digital controllers are gradually taking the place of analog controllers in the control of the LLC resonant converter due to the advantages of the …
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SOA enhanced optical line terminal for future optical access network
… requires overcoming the large dynamic range of burst-mode upstream packets, typically around 20.5 dB, caused by differential loss between optical network units (ONUs). Conventional burst-mode receivers rely on transimpedance amplifiers (BM-TIAs) that adjust electrical gain for each burst, but …
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Investigations of sub-systems for dynamic wavelength-routed optical networks
… with a specific focus on acknowledged optical-burst-switching (OBS) architectures where burst lengths are expected to be in the millisecond regime. The key sub-systems are identified and examined both individually and in terms of their interoperability. The feasibility of existing systems is …
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Designing an ultra low quiescent current buck switching regulator
… LT3481 buck regulator. The converter will use burst mode, pulse frequency modulation, and pulse width modulation to achieve control over the entire load range. The capabilities of a full BiCMOS process technology will be taken advantage of to enable implementation of good control dynamics at …
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Performance and analysis of the plasma bipolar junction transistor: Control of the surface electrical properties
… The application of the black silicon PBJT as a burst mode digital transistor was demonstrated experimentally.
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Adaptive multilevel quadrature amplitude radio implementation in programmable logic
… This thesis presents an adaptive M-QAM modem hardware architecture, suitable for use as a modem core for programmable software defined radios (SDRs) and broadband wireless applications. The modem operates in “burst” mode, and can reliably synchronize to different QAM constellations …
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Examining ablation efficiency in alumina ceramics utilizing femtosecond laser with mhz/ghz burst regime /
… One way to increase the speed is to use a burst mode, where the femtosecond laser fires pulse trains at MHz or GHz frequencies. The aim of this study was to evaluate the impact of MHz/GHz burst modes on the ablation efficiency and speed of alumina ceramics. The study was conducted by …
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Fast all-digital carrier synchronization techniques for linear modulation formats
… carrier phase and frequency offsets, due to modem oscillator discrepancies and distances between the users, corrupt the received data and must be removed for proper data decisions. The proposed techniques are evaluated in an additive white Gaussian noise (AWGN), non-multipath, …
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Design and Control of a Compact 7.2 kW GaN-Based Bidirectional Isolated On-Board Charger (OBC)
… is implemented in both charging and discharging modes, as well as constant-current (CC), constant-power (CP), and constant-voltage (CV) operations. Burst mode is introduced to further increase the range of full ZVS and 75% qZCS. Finally, the research presents remarkable hardware design …
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Low Power IC Design with Regulated Output Voltage and Maximum Power Point Tracking for Body Heat Energy Harvesting
… be used by a variable load. A comparator-based burst mode operation affords the converter a high conversion ratio at high efficiency, while fractional open circuit voltage maximum power point tracking ensures that the controller can be used with a variety of TEGs and TEG setups. This control …
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Multi-Channel Constant Current (MC3) LED Driver for Indoor LED Luminaries
… analyze the current cross regulation, a general model is derived. The circuit has been simulated under various LED load conditions to verify its good current sharing capability. In order to further improve efficiency, simplify the driver's complexity and reduce cost, a LLC resonant topology is …
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Derivation of Parabolic Current Control with High Precision, Fast Convergence and Extended Voltage Control Application
Current control is an important topic in modern power electronics system. For voltage source inverters, current control loop ensures the waveform quality at steady state and the fast response at transient state. To improve the current control performance, quite a few nonlinear control strategies …
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State-Trajectory Analysis and Control of LLC Resonant Converters
… transient, start-up, over-load protection and burst operation, it is hard to control the current and voltage stresses and oscillations in the resonant tank. Moreover, to meet the high power density requirement, the LLC is required to operate at a high switching frequency. Thus the driving of …
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Design of energy-efficient high-speed wireline transceiver
… that the data traffic in a real system is bursty, a full-rate burst-mode transceiver that achieves rapid on/off operation needed for energy-proportional systems is presented. By injecting input data edges into the oscillator embedded in a classical type-II digital clock and data recovery …
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