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 52 for “"Phase control"”.
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Techniques for high-performance digital frequency synthesis and phase control
… to achieve excellent in-band and out-of-band phase noise, respectively. In addition, a passive digital-to-analog converter (DAC) structure is proposed as an efficient interface between the digital loop filter and a conventional hybrid voltage-controlled oscillator (VCO) to create a …
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Phase Control and Transformations of Azole-Based Metal Organic Framework Composites
… separation. In this dissertation, we explore the phase control and dynamics of zinc-azolebased MOFs in crystalline, liquid, and glassy states. We first study ZIF-7 phase control using mechanochemical synthesis. Ammonium nitrate was found to be a good catalyst in mechanochemical ZIF formation, with …
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Design issues in the stance phase control of above-knee prostheses
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1983.
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Modeling and trajectory planning for acoustically aware aircraft with propeller phase control
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-12-01
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Phase control of delta-connected single-phase grid-forming inverters for auxiliary signal injection
This thesis presents a strategy for controlling the phase differences of a three-phase voltage source made up of single-phase droop-controlled grid forming inverters arranged in a delta configuration. We begin by deriving the simplified $dq$ model of a three-phase ($3\phi$) grid-forming inverter …
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Dynamic and geometric control of electronic spins in diamond for quantum sensing and quantum information science
… Its capability of robust but high-precision spin control allows the NV center to be not only a useful atomic-scale magnetic field sensor but also an attractive building block for quantum processors. In this dissertation, I present novel schemes to dynamically and geometrically control NV spins for …
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Ultra-high precision scanning beam interference lithography and its application : spatial frequency multiplication
… grating patterns with around ten-nanometer phase repeatability. There were many factors which limit its precision and thus limit its utility for applications which require more precise phase control. In this thesis the main sources of error impairing the Nanoruler's patterning precision, …
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ANALYSIS, OPTIMIZATION, AND PRACTICAL DESIGN OF A SPLIT-PHASE DICKSON SWITCHED CAPACITOR CONVERTER FOR HIGH CURRENT APPLICATIONS
… spikes. This can be solved using as split-phase control, which addresses charge redistribution in the Dickson SCC by controlling the charging and discharging of the flying capacitors, such that the equivalent branch voltages line up when switching occurs. In adapting the split-phase Dickson …
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Optical feeds for phased array antennas
This thesis investigates optical feed methods for phased array antennas. The technical and practical limitations are analyzed and an optimum design is determined. This optimum optical feed is a two-beam interferometric approach which uses acoustooptic phase control. The theory is derived; a …
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Resonant power conversion topologies for inductive charging of electrical vehicle batteries
… When coupled to the vehicle inlet, the frequency-controlled series-resonant converter results in a capacitively-filtered series-parallel LCLC (SP-LCLC) resonant converter topology with zero voltage switching and many other desirable features. A novel time-domain transformation analysis, termed …
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A 0.78mm² Co-Channel Interference Canceller in 130nm SOI RF CMOS with Novel Passive Phase Shifters and Combiner Circuitry
… LNA for cancellation. The system contains novel phase shifters and digital capacitor architectures and a novel front end combination circuit. The system provides 6 bits of phase control and 5 bits of amplitude control and 25dB of cancellation is demonstrated. The measured IIP3 was +7dBm and the …
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Characterization and control of a new high-torque motor for autonomous wearable robotics
… experimentally using a custom dynamometer and controller. The prototype was found to have a torque constant Kt of 7.26 Nm/A and a per-phase winding resistance of 0.59 Ohms. It is characterized by high AC and DC zero-current torque, as well as significant torque ripple (M: 12.9%, SD: 0.6%) when …
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The application of thyristors to induction motor drive systems
… power circuit arrangements of thyristors for controlling the speed of an induction motor through control of the stator voltage. The output voltage harmonic structure is provided for each circuit along with a comparison of the motor torque-speed characteristics. Means for coping with the motor …
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A fully-integrated all-digital outphasing transmitter for wireless communications
… transmitter chip leverages flexible digital phase modulators (DPMs) to adaptively compensate for amplifier mismatches. As the DPM uses a digital input to directly modulate the RF phase of each path, the phase control becomes very simple and accurate for power amplifier (PA) gain/phase …
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Analysis and design of high power density resonant switched-capacitor converters
… and high conversion efficiency. A split-phase control scheme is used in order to eliminate the current transients associated with the Dickson SC converter and the resultant power loss. Employing these techniques, a Dickson SC converter prototype is implemented with GaN transistors. The …
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Microwave CMOS Beamforming Transmitters
… to tens of GHz. The possibility for small sized phased antenna arrays then reveals, giving high directivity of the antenna and the potential for electrical beam steering. This both reduces interference to nearby receivers through spatial selectivity, and increases the equivalent isotropic …
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LOCSET phase locking : operation, diagnostics, and applications
… Electronic-frequency Tagging (LOCSET) phase locking technique developed and employed here are AFRL. The primary objectives of this effort are to detail the fundamental operation of the LOCSET phase locking technique, recognize the conditions in which the LOCSET control electronics …
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Energy-efficient wireline transceivers
… clock and data recovery circuit (CDR) using phase-rotating phase-locked loop (PRPLL) to conduct phase control so as to break several fundamental trade-offs in conventional receivers; (2) a 4-10.5Gb/s continuous-rate CDR with novel frequency acquisition scheme based on bang-bang phase detector …
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Electro-Mechanical Interactions in Superconducting Spoke -Loaded Cavities
… cavity. Finally, electromechanical frequency and phase control methods to compensate the microphonic-noise of superconducting spoke-loaded cavities are presented. The techniques and methods developed here advance characterization and tuning techniques which are beneficial for all superconducting …
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A spread-spectrum clock generator using phase interpolation for EMI reduction
… analog output signal of the DAC. Leveraging on a phase control architecture rather than a traditional PLL, the SSCG system is shown to reduce the spectral height a divided down clock spur up to 19.6dB. The SSCG is designed in TSMC's 65nm CMOS process. It takes in quadrature, differential clocks at …
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