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 17 of 17 for “"Frequency multiplier"”.
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Modulated Frequency Multiplier Inverter
… and wireless power transfer require high frequency power inverters (or rf power amplifiers) that are able to output a wide power range despite highly variable load reactances, while also maintaining high efficiency. Previous approaches to this problem, such as switched-mode inverters …
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Low-Power CMOS Circuits for High-Performance Deep Submicron System on a Chip
Delay-locked loop (DLL)-based clock multipliers have several inherent advantages over conventional PLL-based clock multipliers. We propose a phase detector with reset circuitry and a new frequency multiplier to overcome the limited locking range and frequency multiplication problem of conventional …
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Terahertz frequency synthesis in CMOS for a chip-scale molecular clock
… circuits in CMOS for a new CSMC. A 60GHz VCO, frequency multiplier chain, and terahertz detector were designed for the high-frequency front-end of a 231GHz transceiver. This involved iterative circuit and electromagnetic optimization from schematic to layout. The circuits were integrated with …
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DESIGN OF DYNAMIC CAPACITIVE WIRELESS POWER TRANSFER SYSTEMS FOR ELECTRIC VEHICLE CHARGING
… in fringing fields. State-of-the-art high-frequency capacitive wireless power transfer (WPT) systems are limited in their power transfer capability due to the limited power rating of the semiconductor devices used in their inverters. This thesis presents several passive power-combining …
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Investigation and application of high-efficiency large-step-down power conversion architectures
… an additional control technique using Variable Frequency Multiplier (VFX) inverters and/or rectifiers. The second converter architecture combines the properties of an active bridge converter with multiple stacked inverters, a multi-winding single core transformer, and a reconfigurable rectifier. …
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Very-high-frequency low-voltage power delivery
… Contributions include development of a new VHF frequency multiplier inverter suitable for step-down power conversion, and a Si CMOS switched-capacitor step-down rectifier. These are applied to develop a prototype GaN-Si hybrid dc-dc converter operating at 50 MHz. Additionally, this thesis …
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Solid-State Terahertz And Millimeter-Wave Electronics: Reaching The Fundamental Limits
… example, in Chapter 1 we show a traveling-wave frequency multiplier for high power and wide-band terahertz and mm-wave signal generation. It takes advantage of standing-wave formation and loss cancelation in a distributed structure to generate high amplitude signals resulting in high harmonic …
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Adaptable power conversion for grid and microgrid applications
… In this thesis, a control technique, Variable Frequency Multiplier (VFX), is developed which compresses the effective operating range required of a resonant converter by switching the inverter and/or rectifier operation between processing energy at a fundamental frequency and one or more …
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Low jitter phase-locked loop clock synthesis with wide locking range
… systems which employ a phase-locked loop for frequency and clock synthesis with on-chip VCO. This dictates an integrated CMOS implementation of the VCO with very low phase noise performance. The ring oscillator VCOs based on differential delay cell chains have been used successfully in …
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Novel radio frequency applications and automated characterisation of silicon quantum dots
… unit. In this thesis, we focus on novel radio frequency (RF) implementations of silicon quantum dots as charge sensors and frequency multipliers. A major concern with large arrays of silicon QDs is the requirement of complex tuning protocols due to device inhomogeneity, which is currently done …
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Magnetoelectric (ME) composites and functional devices based on ME effect
… the design of sensor working at specific frequency range, sensitivity, noise density characterization, etc. Furthermore, the extremely low frequency (< 10-3 Hz) magnetic sensor has undergone a redesign of the charge amplifier circuit. Additionally, the noise model has been established to …
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Millimeter-Wave and Sub-Terahertz Parametric Harmonic Generation
… The maximum conversion efficiency of reactive frequency multipliers is 1/N. The related P-V curves are described by the Chebyshev polynomials. Impulse representation of pumped parameters is also developed to represent a transient train of pulses to describe the resistive multipliers. Several …
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Frequency Locking Techniques Based on Envelope Detection for Injection-Locked Signal Sources
Signal generation at high frequency has become increasingly important in numerous wireline and wireless applications. In many gigahertz and millimeter-wave frequency ranges, conventional frequency generation techniques have encountered several design challenges in terms of frequency tuning range, …
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Electrical behaviour of quantum systems at high frequencies - Bridging the gap between transistor and qubit
… the use of nonlinear quantum systems as a frequency multiplier based on single-electron transitions. The spin and charge dynamics in a doubly occupied double quantum dot in the presence of spin-orbit coupling are also explored, with particular emphasis on Pauli spin blockade and its …
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Fabrication of InGaP LEDs on a graded buffer substrate
… a combination of an infrared laser diode and a frequency multiplier. Light emitted by the laser diode is passed through a frequency doubler, which is a non-linear device that combines photons to create photons of higher energy within the material. For commercially available green lasers, an …
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Design, optimization and analysis techniques of non-linear devices based on graphene or highly ordered pyrolytic graphite for terahertz system applications
… harmonic content. These devices are based on frequency multiplication and frequency mixing on mono- and multi-layer graphene films which are used for the generation and/or detection of submillimeter wave/ low THz band signals. The desired frequency multiplication and mixing performance of the …
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Digital enhancement techniques for fractional-N frequency synthesizers
… thesis is on improving the energy efficiency of frequency synthesizers and clocking modules by exploring design techniques at both the architectural and circuit levels. In the first part of this work, a digital fractional-N phase locked loop (FNPLL) that employs a high resolution time-to-digital …