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 80 for “"DBC"”.
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Thermo-mechanical Analysis of a Custom PCB-DBC Hybrid Package for a (650 V, 150 A) e-GaN HEMT
… printed circuit board-direct bonded copper (PCB-DBC) hybrid package to house a 650 V, 150 A GaN HEMT. Called the PCB-Interposer-on-DBC package, it utilizes a DBC for heat extraction while using vertical pin interconnects to minimize electrical parasitics. Previous work did not investigate the …
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Untersuchungen zur Dynamik von Blockcopolymeren in der Grenzfläche von Polymerblends mit rheologischen Methoden
… Dynamik von symmetrischen Diblockcopolymeren (DBC), die sich in der Grenzfläche zwischen Matrix und kugelförmig dispergierter Phase eines Polymerblends befinden. Da davon ausgegangen werden konnte, dass die Dynamik der DBC in der Grenzfläche stark von ihrem molekularem Aufbau abhängt, wurden …
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Frequency and phase locking of a CW magnetron : with a digital phase locked loop using pushing characteristics
… with a very small RF signal (of the order of -40 dBc) creating a suitable RF source for particle accelerators and other sophisticated applications. We will go on to discuss the characterization of the magnetron with differing heater powers and load conditions when operated with a low cost switched …
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A 1.8-Ghz CMOS Fractional -N Frequency Synthesizer With Randomized Multiphase VCO
… standard 0.6-mum CMOS technology, achieves -118 dBc/Hz phase noise at 1-MHz offset and exhibits close-in phase noise between -80 and -90 dBc/Hz up to the PLL loop bandwidth. The synthesizer has a frequency resolution of 10 Hz and dissipates 52 mW from a 3.3-V supply.
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Noise Levels in a South African bank cash centre
… as well as the peak SPL levels expressed in dBC. These measurements enabled the researcher to compare the noise levels to current legislation regarding noise exposure within the work place. The results revealed a mean Lex,8h of 75.87 dBA (SD=6.09) during the coin processing procedures, …
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Gallium nitride class-F power amplifier for UMTSWCDMA applications
… IM products of the designed class F PA is -13 dBc and -21 dBc respectively at peak power and -28.5 dBc and -43 dBc respectively at 6 dB back-off from peak power.
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Multi-Bit Delta -Sigma Modulation Technique for Fractional-N Frequency Synthesizers
… it exhibits an in-band phase noise of --92 dBc/Hz at 10-kHz offset with a reference spur of less than --95 dBc. Experimental results show that the proposed system is applicable to low-cost, low-power wireless applications and that it meets the requirements of most RF applications including …
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Density-based clustering of information networks by substructure optimization
… by clustering. Density-based clustering (DBC) differs from vertex-partitioning methods in that some vertices are classified as noise. This approach is useful in practice to classify groups of related entities within noisy networks. The baseline DBC method involves constructing a maximal …
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Graph-based genomic signatures
… a graph-theoretic setting. A de Bruijn chain (DBC) is a marriage of a de Bruijn graph and a finite Markov chain. By representing a DNA sequence as a walk over a DBC and retaining specific information at nodes and edges, we are able to obtain the de Bruijn chain genomic signature (DBCGS), based …
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Design of a High Temperature GaN-Based VCO for Downhole Communications
… Measured phase noise at 230 °C is from -121 dBc/Hz to -109 dBc/Hz at 100 KHz offset.
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A 5-6 Ghz Silicon-Germanium Vco With Tunable Polyphase Outputs
… buffer. The measured phase noise is -115.5 dBc/Hz at a 1 MHz offset and a tank varactor control voltage of 1.0 V. The VCO figure-of-merit (FOM) for the symmetric inductor VCO is -179.2 dBc/Hz, which is within 4 dBc/Hz of the best reported VCO in the 5 GHz frequency regime. The die area …
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Design and Analysis of a 80 GHz Hybrid CMOS Dielectric Resonator Oscillator
… The DRO achieves a simulated phase noise of -128 dBc/Hz at 1MHz and -148 dBc/Hz at 10MHz.
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Cytotoxicity and anti-mycobacterial activities of sclerocarya birrea and Dodonae viscosa anguistifolia against MTB strain
… a total of 8 crude extracts (SBC, SBH, SLC. SLH, DBC, DBH, DLC, DLH). Phytochemical analysis was conducted on all extracts using thin layer chromatography (TLC), the profiling of metabolites was achieved with liquid chromatography-Mass spectrometry (LCMS) method. The antimycobacterial activity …
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Terahertz beam-steering imager using a scalable 2D-coupled architecture and multi- functional heterodyne pixels
… phase noise at 1-MHz frequency offset is -90 dBc/Hz for an 8 x 8 array and -101 dBc/Hz for a 32 x 32 array. This chip is capable of digital beam steering, too. The first version of the chip prototype with a 10 x 10 array is fabricated using a 130-nm SiGe BiCMOS process and tested.
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The function of Nup358 in nucleocytoplasmic transport
… anhäuften, darunter der putative Tumorsuppressor DBC-1 (Hutten, 2007). Des Weiteren führt die Depletion von Nup358 mittels RNA-Interferenz (RNAi) zu einer verlangsamten Transportrate von Proteinen, die entweder durch den Importin α/β-Komplex (Hutten et al., 2008) oder durch Transportin (Hutten et …
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Switchmode Power Supply Miniaturization with Emphasis on Integrated Passive Components on Prefired High Performance Ceramic Substrates
… have been generated using Direct Bond Copper (DBC) on ceramic, Insulated Metal Substrate (IMS), Printed Circuit Boards (PCB), and prefired ceramic thick film technology. The integrated passive components developed are applied on prefired ceramic versions and compared to the DBC, IMS and PCB …
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Lithium niobate RF-MEMS oscillators for IoT, 5G and beyond
… noise performances of the VCMO are -72 and -153 dBc/Hz at 1 kHz and 10 MHz offsets from 178.23 and 175.83 MHz carriers, respectively. The VCMO consumes a direct current (DC) of 60 µA from a 1.2 V supply while realizing a tuning range of 2.4 MHz (~ 1.4% tuning range). Such VCMOs can be applied to …
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A Design-by-Contract based Approach for Architectural Modelling and Analysis
… the thesis how XCD extends Design-by-Contract (DbC) for specifying (i) protocol-independent components and (ii) complex connectors, which can impose only local constraints to guarantee their realisability. Use of DbC will hopefully make it easier for practitioners to use the language, compared …
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Linearity Enhancement of High Power GaN HEMT Amplifier Circuits
… of this technique, improvement in IMD3 of 4 dBc has been shown for a 0.8-1.0 GHz PA (Power Amplifier), and 9.5 dBm in OIP3 (Third-order Intercept Point) for an S-Band GaN LNA, with linearity FOM (IP3/DC power) reaching up to 20. Large-signal simulation and analysis have been done to …
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PCB-Based 1.2 kV SiC MOSFET Packages for High Power Density Electric Vehicle On-Board Chargers
… SiC MOSFET half-bridge packages and a hybrid PCB/DBC-based 1.2 kV SiC MOSFET full-bridge package for EV on-board charger applications. The first of the two PCB-embedded packages has integrated gate drive circuitry, less than 2.3 nH loop inductances, and dual-sided cooling with a total …
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