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 12 of 12 for “"50 GHz"”.
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Caracterización experimental de la propagación a 50 GHz en trayecto inclinado
… ETSI de Telecomunicación que midió la baliza de 50 GHz del satélite ITALSAT durante un periodo de 1 año. La Tesis estudia principalmente tres efectos: el centelleo troposférico, la atenuación por lluvia y las características dinámicas de los desvanecimientos. Para cada efecto, se analiza el …
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Design of a 50 GHz Bandwidth DPSK Compatible Monolithically Integrated Optical Receiver
… InP double heterojunction bipolar technology for 50 Gb⁄s differential phase shift keying (DPSK) applications. For the InP ⁄ InGaAs double-heterojunction bipolar transistor (DHBT), a small signal equivalent model based upon the Gummel-Poon bipolar junction transistor model was used. This model was …
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Design of millimetre-wave input-reflectionless amplifiers in 45nm CMOS-SOI Technology
… is 5.3 mW. It has a peak gain of 5.3 dB at 31 GHz. The input-power-matching levels of the designed amplifier are better than 10 dB from DC to 50 GHz. The second design is a two-stage amplifier, is a two-stage narrowband amplifier which builds upon the design technique and extend it to …
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Time Diversity Modelling and Implementation for Broadcast Satellite Systems at V-band
… variations in TD performance at 20, 40 and 50 GHz. Similar to rain attenuation, the summer months yielded the highest TD gain. The seasonal analyses also led to the observation that cumulative distributions of TD gain decrease along the trend of gain magnitudes, following the seasonal order …
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Large Signal HBT Model and Integrated Circuit Design Using 300-Ghz Indium Phosphide HBT Technology
… S21 of 18 dB and a 3-dB bandwidth of 50 GHz, producing a gain-bandwidth product of 397 GHz which is over two times of the value measured from the VGA designed by conventional method in the same process. Linearity is measured, and the model developed in this work shows the best …
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Substrate Impurity Incorporation Mitigation for Improved AlGaN/GaN-ON-Si RF Performance
… well below 0.4 dB/mm for frequencies up to 50 GHz, compared to conventional AlGaN/GaN on Silicon heterostructures. For AlGaN/GaN HEMTs, this improvement of the RF performance is critical for high-power/high-frequency operation with enhancements to RF switching speed, power, gain, and …
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CMOS Receiver Design for Optical Communications over the Data-Rate of 20 Gb/s
… amplifier (TIA) is designed to achieve 50% higher data-rate is presented, and a new architecture for clock recovery is proposed for 50% higher clock rate. The TIA is based on a gm-boosted common-gate amplifier. The input-resistance is reduced by modifying a transistor at input stage to …
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Scalable design of high-performance on-chip Terahertz source and imager
… oscillation at fundamental frequency fo= 2 50 GHz; (ii) synchronize phase of fo and its harmonics among elements; (iii) cancel near-field radiation of fo, 2fo and 3fo, and (iv) efficiently radiate at 4fo and combine power in free space. The resultant compact design fits into the optimal …
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Redes ópticas de longa distância com transceptores de taxa de código variável
… de dispersão cromática e com espaçamento de 50 GHz entre canais na banda-C. A análise quantitativa baseou-se em três topologias representativas - redes alemã, europeia e americana - com respeito ao custo, à capacidade e à sobrevivência. O canal óptico foi modelado de acordo com os parâmetros …
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High-fidelity microwave control of single-atom spin qubits in silicon
… control, designed to work at frequencies up to 50 GHz. These tools have allowed us to demonstrate the first ever single-atom spin-qubits in natural silicon, leading the way to demonstrating record qubit performances in isotopically purified 28Si: an electron spin qubit with measurement and …
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Accurate Prediction of Scintillation Degradation Applicable to Satellite Communication Systems Design
… systems operating at high frequencies (> ~10GHz) and low elevation angles, and utilising small antennas. Scintillation effects need to be considered in the design and link-budget calculations of these systems.<br/><br/>In this thesis, the results are shown of an extensive measurement analysis …
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Current Induced Magnetisation Dynamics in Ferromagnetic Nanowires
… The individual nanowires are excited by a 70 GHz Gaussian electric current pulse applied parallel to the nanowire axis. The calculated transient magnetisation distributions and power absorption spectra indicate predominately curling mode resonance for nanowire diameters ≥ 20 nm with …