Дисертації з теми "Low power excitation source"
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Roy, Sajib, and Md Murad Kabir Nipun. "Understanding Sub-threshold source coupled logic for ultra-low power application." Thesis, Linköpings universitet, Elektroniksystem, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-69404.
Повний текст джерелаGonzález, Fernández Ernesto. "Low-power techniques for wireless gas sensing network applications: pulsed light excitation with data extraction strategies." Doctoral thesis, Universitat Rovira i Virgili, 2021. http://hdl.handle.net/10803/672792.
Повний текст джерелаLa presente tesis está enfocada en dos líneas de investigación, La primera aborda el desarrollo de una metodología basada en luz pulsada para modulación de sensores químico-resistivos para la extracción de información de la señal transitoria; y la segunda plantea la implementación de una red inalámbrica de sensores (WSN) basada en tecnología LoRa para la monitorización de la calidad del aire (AQM) y la detección de eventos de fuga de gases. Este documento está estructurado en cuatro capítulos organizados de la siguiente forma: el Capítulo 1 presenta el estado del arte, una introducción a los mecanismos de mejora del comportamiento de los sensores químico-resistivos, así como una introducción a la implementación de redes inalámbricas de sensores para la monitorización de la calidad del aire; el Capítulo 2 está compuesto por los dos artículos publicados relacionados con la metodología basada en la modulación utilizando luz pulsada para la extracción de información de la señal transitoria de sensores químico-resistivos; el Capítulo 3 presenta el artículo publicado relacionado con la implementación de una WSN para AQM; el Capítulo 4 presenta las conclusiones derivadas de los resultados obtenidos durante el desarrollo de el proyecto de tesis y las recomendaciones para el trabajo futuro asociado a la continuidad de los principales resultados de esta tesis.
The present thesis project is focused in two different yet related research lines. The first one addresses the development of a pulsed light-based chemiresistive sensor modulation methodology for transient information extraction. The second research line developed deals with the implementation of a LoRa-based portable, scalable, low-cost, and low power Wireless Sensor Network (WSN) for Air Quality Monitoring (AQM) and gas leakage events detection. This document is structured in four Chapters organized as follows: Chapter 1 presents the state of the art, an introduction to sensing performance enhancement and transient data extraction methods, as well as an introduction to the implementation of WSN for AQM; Chapter 2 is composed of the two published paper related to the pulsed light modulation methodology for transient information extraction; Chapter 3 presents the published paper related to the implementation of a LoRa-based WSN for AQM; Chapter 4 states the conclusions derived from the results obtained during this thesis project and the recommendations for the future work associated to the continuity of this thesis findings.
Bicer, Nazan. "A Current Source Converter Based Statcom For Reactive Power Compensation At Low Voltage." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/2/12612007/index.pdf.
Повний текст джерелаOrdóñez, Hurtado Andrés Fernando. "Design methodology of a modular CMOS ultra-low power self-biased current source." reponame:Repositório Institucional da UFSC, 2017. https://repositorio.ufsc.br/xmlui/handle/123456789/178587.
Повний текст джерелаMade available in DSpace on 2017-08-22T04:25:03Z (GMT). No. of bitstreams: 1 347153.pdf: 5611883 bytes, checksum: ffcc82f51f6a3197acb623b2af028078 (MD5) Previous issue date: 2017
Neste documento é desenvolvida uma metodologia de projeto de uma fonte de corrente auto polarizada de ultra baixo consumo de potência em tecnologia CMOS. É descrita uma topologia modular implementada com dois MOSFETs auto cascodados (SCMs) e um amplificador operacional. A metodologia proposta está baseada no conceito de ni´veis de inversão e o espaço de projeto do circuito é descrito principalmente em termos das especificações do amplificador operacional e do espelho de corrente PMOS. O circuito foi projetado usando uma tecnologia padrão CMOS de 130 nm. Os resultados das simulações são apresentados neste documento para validar a metodologia de projeto e o desempenho da fonte de corrente, mostrando que o circuito proposto pode operar com uma tensão de alimentação menor de 1 V e com menos de 1%/V na regulação de linha.
Abstract : In this document a design procedure of a CMOS ultra-low-power self-biased current source is developed. A modular topology using two self-cascode MOSFETs (SCMs), a current mirror and an operational amplifier is implemented. The described methodology is based on the concept of inversion level, and the design space of the current source is described mainly in terms of the specifications of the operational amplifier and the PMOS current mirror. The circuit was designed in a 130 nm standard CMOS technology. Simulation results are provided to validate the design methodology and the performance of the current source, showing that the proposed circuit can operate at a supply voltage less than 1 V with less than 1%/V of line regulation.
Amor, Nadia [Verfasser]. "Novel methods and applications of NMR and MRI : low-power RF excitation and hyperpolarized xenon-129 / Nadia Amor." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2012. http://d-nb.info/1021937592/34.
Повний текст джерелаLysakowski, Rich. "Development of a low-power molecular microwave plasma and its application as an atom source for atomic spectroscopy." Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/51932.
Повний текст джерелаPh. D.
MOSCA, CARMELO. "Methodologies for Frequency Stability Assessment in Low Inertia Power Systems." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2895393.
Повний текст джерелаKallel, Bilel. "Design of Inductive Power Transmission System for Low Power Application with Movable Receiver and Large Air Gap." Universitätsverlag Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A32975.
Повний текст джерелаDie induktive Energieübertragung ist interessant, nicht nur für Systeme, bei denen die Energieübertragung in rauen, feuchten und nassen Bereichen erfolgen soll, sondern auch für mobile und sehr kleine Systeme. Diese Art von Energieübertragung findet heute eine breite Anwendung in verschiedenen Bereichen, wie z.B. Industrie, Automobil, Medizin und intelligente Gebäude. Um eine gute Effizienz und eine hohe Energieübertragungsleistung zu realisieren, sollten die Sende- und Empfangsspulen perfekt ausgerichtet und nahe beieinander sein. Insbesondere bei Systemen mit beweglichen Teilen ist jedoch eine Fehlausrichtung zwischen Sender und Empfänger unvermeidlich. Diese Arbeit zielt darauf ab, die übertragene Leistung, die gegenseitige Induktivität, die Leistung an der Last und damit den Wirkungsgrad der Leistungsübertragung im Falle einer seitlichen Fehlausrichtung zwischen Sende- und Empfangsspule und bei großem Abstand von Spule zu Spule zu verbessern. Zu diesem Zweck wird ein Multi-Input Single-Output (MISO)-Spulensystem vorgeschlagen, das in der Lage ist, das ausgegebene Magnetfeld auf die Empfangsspule auszurichten, indem die benachbarten Spulen der aktiven Sendespulen mit einem schwachen Strom in der entgegengesetzten Richtung versorgt wird. Darüber hinaus wurde ein analytisches Modell für die verwendeten Spulen und ein genaues dreidimensionales Modell für das System entwickelt, um die induzierte Spannung, den induzierten Strom und die äquivalente gegenseitige Induktivität zu berechnen. Sowohl die Simulation als auch die experimentellen Ergebnisse belegen, dass das vorgeschlagene induktive Mehrfachspulensystem mit hexagonaler Anordnung und die Sendespulen, die den halben Durchmesser der Empfangsspule haben, in der Lage sind, die Sendeleistung bei lateraler Fehlausrichtung und großem Luftspalt deutlich zu verbessern. Das neuartige MISO-System erreicht einen besseren Wirkungsgrad, beginnend mit einem Luftspalt von 50% des Sendespulendurchmessers und einer Fehlausrichtung von 28% des Sendespulendurchmessers. Sie erreicht bei 50 mm Luftspalt (entspricht 166% des Sendespulendurchmessers) und bei 10 mm seitlichem Versatz (entspricht 33% des Sendespulendurchmessers) das Doppelte der Sendeleistung des herkömmlichen Zwei-Spulen-Induktivsystems. Um die äquivalente gegenseitige Induktivität zwischen Primär- und Sekundärseite zu verbessern und Energieverluste zu vermeiden, schlagen wir ein Verfahren zur Detektion des Empfängers vor, bei dem die Sendespulen selbst als Detektoren verwendet werden. Dabei werden nur die Sendespulen unter dem Empfänger aktiviert und die anderen bleiben ausgeschaltet. Dazu wird der Scheitelwert des Wechselstroms der Sendespulen gemessen und mit einem vorgegebenem Schwellenwert verglichen. Die Anregungsstrategie der aktiven Spulen wird entsprechend der Position der Empfangsspule optimiert. Die neuartige Anregungsstrategie erhöht die gegenseitige Induktivität um 85% und die induzierte Spannung um 13% bei perfekter Ausrichtung und um 30% bzw. 10% bei 10 mm seitlichem Versatz, im Vergleich zum MISO-System ohne Empfängerdetektor und Spulenanregungsstrategie. Um die übertragene Leistung durch Resonanz zu erhöhen, wurden verschiedene Systemtopologien untersucht, wie z.B. Serien-SS, Serien-Parallel-SP, Parallel-Series-PS und Parallel-Parallel-PP-Topologien für verschiedene Stufen der Lastimpedanz. Die Ergebnisse zeigen, dass ein MISO System mit parallel-paralleler PP-Topologie eine höhere Sendeleistung realisiert als die anderen Topologien für hohe und niedrige Last-Impedanzen. Das vorgeschlagene induktive Mehrspulensystem eignet sich für Systeme mit geringer Leistung, wie drahtlose Sensoren und biomedizinische Implantate, kann aber auch flexibler Position des Empfängers in einen höheren Leistungsbereich angewendet werden.
Ghasemi, Negareh. "Improving ultrasound excitation systems using a flexible power supply with adjustable voltage and frequency to drive piezoelectric transducers." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/61091/1/Negareh_Ghasemi_Thesis.pdf.
Повний текст джерелаBouchaala, Dhouha. "Investigation of Current Excitation for Personal Health and Biological Tissues Monitoring." Doctoral thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-204801.
Повний текст джерелаDie Bioimpedanzspektroskopie gewinnt aufgrund ihrer besonderen Eigenschaften als nicht-invasive, schonende Messmethode zunehmend an Bedeutung im biomedizinischen Bereich. Dabei ergeben sich besondere erausforderungen für den Entwurf der Stromquelle zur Realisierung eines stabilen und sicheren Anregungsstroms. Gefordert ist eine hohe Genauigkeit bis zu einem Maximalstrom von 0.5 mA in einem Frequenzbereich, der der β-Dispersion entspricht, von wenigen kHz bis hin zu 1 MHz. Die Stabilität muss bei variablen Lastimpedanzen im Bereich von 100 Ω bis 10 kΩ gewährleistet sein. Dafür muss die Stromquelle eine hohe Ausgangsimpedanz aufweisen. Diese Arbeit fokussiert auf den Entwurf von spannungsgesteuerten Stromquellen. Verschiedene Arten von Stromquellen wurden untersucht und verglichen. Der "Voltage-Modus-Ansatz" mit Masse-referenzierter Last hat sich als besser geeignet und stabiler für biomedizinische Messungen erwiesen. Die Tietze-Schaltung und diese Howland-Schaltung zeigen dabei die niedrigsten Fehler des Ausgangsstroms und die höchste Ausgangsimpedanz. Im direkten Vergleich besitzt die verbesserte Howland-Schaltung doch eine einfachere Struktur, höhere Genauigkeit und bessere Stabilität und wird daher gegenüber der Tietze-Schaltung bevorzugt. Um weitere Stabilitätsverbesserungen bei der Howland-Schaltung zu erreichen, werden zwei Maβnahmen vorgeschlagen. Zum einen werden kompensierte Operationsverstärker eingeführt und zum anderen wird der Einfluss von Streukapazitäten bei hohen Frequenzen minimiert indem die Verstärkung mit Kondensatoren kompensiert wird. Durch diese Maβnahmen wird eine Genauigkeit von 0.5% bei niedrigen Frequenzen und 0.9% bei 1 MHz ermöglicht. Mit dem neuen Entwurf der spannungsgesteuerten Stromquelle ist ein entscheidender Meilenstein für die Realisierung tragbarer Messsysteme der Bioimpedanz erreicht. Um eine kurze Messzeit zu realisieren wurde eine vergleichende Studie von Anregungssignalen und deren Signalparameter durchgeführt. Die Ergebnisse zeigen, dass binäre Chirp-Signale aufgrund der reduzierten Messzeit, des niedrigen Crest-Faktors unter 2.8 und hohe Energieeffizienz von mehr als 54% bei hohem Rauschlevel besonders geeignet sind. Simulationsergebnisse zeigen, dass die entwickelte Howland-Stromquelle zusammen mit einem binären Mehrfrequenzsignal den geringsten Amplitudenfehler im gesamten Frequenzbereich realisiert
Abu-Shikhah, Nazih M. "New methods in speech enhancement, and modelling, with applications to low bit rate speech coding." Thesis, Queensland University of Technology, 2001.
Знайти повний текст джерелаMerz, Clifford Ronald. "Investigation and evaluation of a bi-polar membrane based seawater concentration cell and its suitability as a low power energy source for energy harvesting/MEMS devices." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002671.
Повний текст джерелаLühr, Armin. "Collisions of low-energy antiprotons and protons with atoms and molecules." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2010. http://dx.doi.org/10.18452/16084.
Повний текст джерелаIn this work a nonperturbative, time-dependent numerical approach is developed which describes ionization and excitation of atoms or molecules by either PB or P impact based on the impact-parameter method. A spectral close-coupling method is employed for solving the time-dependent Schrödinger equation in which the scattering wave function is expanded in (effective) one- or two-electron eigenstates of the target. This includes for the first time a full two-electron, two-center description of the H2 molecule in PB collisions. The radial part of the one-electron eigenstates is expanded in B splines while the two-electron basis is obtained with a configuration-interaction approach. Calculations are performed for PB collisions with H, H2+, and H2 as well as with He and alkali-metal atoms Li, Na, K, and Rb. Additionally, data are obtained for P collisions with H2, Li, Na, and K. The developed method is tested and validated by detailed comparison of the present findings for P impacts and for PB + He collisions with literature data. On the other hand, total and differential cross sections for ionization and excitation of the targets by PB impact complement the sparse literature data of this kind. Results gained from different targets as well as from PB and P impact are compared with each other and assessed. Furthermore, results obtained with one-electron model potentials are compared to the full two-electron description of H2. Finally, stopping powers for PB impacts are determined.
Bernoux, Béatrice. "Caractérisation de MOSFETs de puissance cyclés en avalanche pour des applications automobiles micro-hybrides." Thesis, Toulouse, INSA, 2010. http://www.theses.fr/2010ISAT0007/document.
Повний текст джерелаResearch work presented in this thesis concern the conception and the study of low voltage power MOSFETs for micro hybrid vehicles (starter alternator). For some of these applications, developed transistors must be able to operate in classical ON and OFF state mode and in avalanche mode at high current and high temperature. To reproduce this operating mode, MOSFETs are submitted to a specific repetitive UIS test. In order to evaluate silicon’s temperature during this test, several temperature measurement methods have been developed and compared. In parallel, in order to understand the impact of repetitive avalanche on the transistor, standard electrical parameters (BVDSS, IDSS, RDSon…) are monitored during the test. The only parameter that seems to be shifting with the number of cycles is the RDSon. This phenomenon is due to the measurement method and to a variation of source metallization resistance during cycling. Indeed several observations have shown source metallization ageing and a shift in its resistivity. Different metallization and assembly parameters have been tested to limit this phenomenon. Also various test structures have been designed to study metallization evolution and to compare different metallization behaviors
Mohamad, Salman. "EVALUATING THE ORGANIC RANKINE CYCLE (ORC) FOR HEAT TO POWER : Feasibility and parameter identification of the ORC cycle at different working fluid with district waste heat as a main source." Thesis, Mälardalens högskola, Framtidens energi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-38573.
Повний текст джерелаNej
Chechi, Dario. "Framework per il benchmarking comparativo dei componenti software su piattaforme embedded multi-core." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23752/.
Повний текст джерелаHolmberg, Andreas. "Experimental Determination of Aeracoustic Sources in Low Mach Number Internal Flows." Licentiate thesis, KTH, MWL Strömningsakustik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26133.
Повний текст джерелаQC 20101118
Experimental characterization of aero-acoustic sources
Bedewy, Ahmed M. "OPTIMIZING DATA FRESHNESS IN INFORMATION UPDATE SYSTEMS." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1618573325086709.
Повний текст джерелаHrtáň, Michal. "Pomocné vinutí pro napájení napěťového regulátoru synchronního generátoru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220567.
Повний текст джерелаKrbal, Michal. "Účinnost přeměny elektrické energie na světlo u současných světelných zdrojů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218541.
Повний текст джерелаWu, Hsin-Hsien, and 吳信賢. "Analysis of Surge Impact on Low-Voltage Power Source." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/65339275716532984859.
Повний текст джерела崑山科技大學
電機工程研究所
102
Power system surge mainly comprises lightning and switching ones.Their accompanied transient huge energy may destroy electrical equipments.In this thesis, the characteristics of surges including lightning and switching types are introduced. Through the operation measuring data of Air Break Switch of Taipower Company, the switching surge are investigated. The ground potential rise caused by the lightning currents lead to ground will affect the low voltage power source. The transient voltage may damage the electrical devices. The EMTP/ATP program is adopted to simulate the low voltage transients caused by the lightning with different striking positions.Simulations with arresters installed are performed.
Pinto, Jorge Miguel dos Santos. "Power Sharing for a Multi-Source Low-Voltage Urban Microgrid." Doctoral thesis, 2021. https://hdl.handle.net/10216/136570.
Повний текст джерелаChang, Ching-Nan, and 張景南. "Study Low Drain-Source On-State Resistance of Power MOSFET." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/jm3q5a.
Повний текст джерела國立臺北科技大學
化學工程研究所
97
In this study, we modify the process of Power MOSFET to improve the device electricity characteristics. We propose the Power MOSFET with the Drain to Source breakdown voltage and Gate Threshold Voltage close in the same chip size condition for the low Drain-Source On-state Resistance optimization design. We reduce the conductive and power loss by the low Drain-Source On-state Resistance. We will utilize: 1. Adjust EPI layer resistance and thickness 2. Adjust Gate Trench depth 3. Adjust the Gate Oxide thickness 4. Adjust the Gate Poly implant dose and driving time 5. Adjust P-Body implant dose and driving time 6. Increase the cell density to reduce the channel and on-state resistance; According to the experiment result, improve Power MOSFET electricity characteristic to reach purpose.
Jia-HuiWang and 王家輝. "Low Power and Area Efficient Output Buffers for TFT-LCD Source Driver." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/88750031350746698027.
Повний текст джерелаHuang, Wei-Lun, and 黃韋綸. "A Low-Power High-Speed Class-B Output Buffer for TFT-LCD Source Drivers." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/83465888121845722522.
Повний текст джерела南台科技大學
電子工程系
95
In this thesis, a low-power high-speed class-B Output buffer for TFT-LCD source driver is proposed. The proposed output buffer employs a complementary differential input to obtain a large input operating range. For the frequency compensation, the conventional method always adopts a miller capacitance, which has area disadvantage. In the proposed circuit, the frequency compensation is realized by only using a compensation resistor to introduce a new zero for stability. The proposed output buffer employs two simple comparators to sense the transients of the input to turn on the output transistors, thus draws little current while static, but has a large driving capability while transient. Moreover, the second output stage is used to improve the speed. The proposed output buffer was simulated basing on 0.35 μm CMOS process. With 3.3 V supply and 600 pF output load, the simulated quiescent current is 3.29 μA. The settling time of rising and falling were 1.88 μs and 1.75 μs, respectively.
Lee, Cheng-Hsueh, and 李承學. "A New Control Strategy Suitable for Low-frequency and High-power Voltage Source Converters." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/w3zuen.
Повний текст джерела國立臺灣科技大學
電機工程系
105
Many control strategies have been developed for Static Synchronous Compensator (STATCOM) nowadays such as decoupled dq frame control, hysteresis control, predictive control, proportional resonant control, etc. Most of the control methods were designed for low power and high switching frequency systems. However, in high power system, voltage source converters should be operated in low switching frequency in order to reduce switching power loss. Traditional control methods may cause significant steady-state error and affect the effectiveness of current control. This thesis proposes an iterative control method based on Quasi-Newton method, which is more suitable to use at low switching frequency in a high power system. The proposed control strategy is applied for STATCOM in balanced and unbalanced condition to compensate the reactive power at the point of common coupling. The results have been both verified by offline simulation with PSCAD/EMTDC and by hardware-in-the-loop simulation with Real-Time Digital Simulator (RTDS).
"Low Power, High Throughput Continuous Flow PCR Instruments for Environmental Applications." Doctoral diss., 2013. http://hdl.handle.net/2286/R.I.20863.
Повний текст джерелаDissertation/Thesis
Ph.D. Electrical Engineering 2013
Chou, Hung-Ting, and 周泓廷. "The Implementation on Ultra-Low Power Source-Driven Mixers for V-Band RF Transceiver Front-end." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/39503601381114070518.
Повний текст джерела國立中央大學
電機工程學系
101
This thesis is primarily targeted to design and implement the key component, mixer, for V-band radio frequency (RF) transceiver front-end using source-driven technology. There are two source-driven mixers are investigated based on 90-nm CMOS process that include both up-conversion and down-conversion topologies. The main design goals aim towards high conversion gain (CG), linearity, and port-to-port isolations under ultra-low voltage low power operations. In the thesis, Chapter 3 proposes a novel up-conversion mixer with pseudo-differential and current-reused topology in TSMC standard 90 nm CMOS technology. The proposed source-pumped up-conversion mixer can operate at near weak inversion under a power consumption of 149 W from a 0.4-V supply voltage while maintains acceptable circuit performance at millimeter-wave (MMW) frequencies. The up-conversion mixer achieves a -0.62 dB conversion gain and a -4 dBm OIP3 in measurements. The measured 3-dB frequency bandwidth ranges from 17.3 to 22.5 GHz. The best figure-of-merit (FOMUp-M) acquires as high as 33.2 under a 0.3-V supply. The chip size including all pads and dummy blocks is 0.72 mm2. Chapter 4 proposes a microwatt (W) source-driven down-conversion mixer with broadband asymmetrical broadside-coupled baluns in UMC 90-nm CMOS low-power (LP) process. The forward body biased (FBB) technique reduces the threshold voltage (VTH) and supply voltage for operation in the near weak inversion region in MMW active mixer designs. To effectively reduce the size of the chip, an asymmetrical broadside-coupled balun is developed with a bandwidth (BW) of 103 GHz (from 34 to 137 GHz) with a low insertion loss of 3.66 dB (3 dB for an ideal balun) at 58 GHz. The chip area of the balun is 0.016 mm2. The proposed FBB mixer has a 4.2-dB peak CG and a 14.3-dBm input IP3 at 55 GHz under a 2-dBm LO power input. The DC power of the FBB mixer core is only 139 W, while it draws a 278-A DC current from a 0.5-V supply. The fabricated FBB mixer, comprising two asymmetrical broadside-coupled baluns, and all of test pads and dummy blocks, occupies an area of 0.72 mm2. An FOMDown-M2 that is obtained using the ultra-low power consumption FBB mixer is as high as 39.1.
de, Godoy Peixoto Daniel. "Ultra-Low-Power IoT Solutions for Sound Source Localization: Combining Mixed-Signal Processing and Machine Learning." Thesis, 2019. https://doi.org/10.7916/d8-we43-y259.
Повний текст джерелаShih, Shan-Hui, and 施善惠. "High efficiency GaAs thin film solar cell with low fabricated cost and applied to portable power source." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/24522367208648845298.
Повний текст джерела國立中興大學
精密工程學系所
104
This study focused on using chemical selective etching (CSE) to fabricate GaAs thin-film solar cells and discussed their characteristics. Additionally, the technique of the recyclable GaAs substrate was developed and realized. This was not only able to obtain a high efficiency solar cell, but also reduce the fabrication cost. All GaAs solar cells were applied to mobile power packs for comparing their device performance. Under CSE process, the AlAs was regarded as a sacrificial layer, which was be etched to assist in the separation of the solar cell epilayer from GaAs substrate. Then the GaAs substrate could be recycled for the next usage as a growth template. The finishing time of completely separating the whole epilayer from four-inch GaAs cell was about 6-10 hours. Thin film solar cells can be transferred to Ni substrate with high thermal dissipation and light weight by means of CSE process. On the other hand, the recycled GaAs substrate was cleaned by the mixture solution of hydrogen peroxide and ammonia and the mixture solution of phosphoric acid and hydrochloric acid, and then it could be reused for the solar cell epitaxial growth by metal-organic chemical vapor deposition. Afterwards, this thin film solar cell was coated with the n-type electrode and an anti-reflective layer to increase the optical path for enhancing the photocurrent. This thesis composed three parts. First of all, the influences of different skills including bending and unbending temporary substrates on the characteristics of solar cells were discussed. In the second part, four different areas of solar cells were designed, such as 0.03 cm2, 0.25 cm2, 0.64 cm2, and 1 cm2, respectively. In addition, the effects of distinct materials of anti-reflective layers and two kinds of base layer thicknesses on the characteristics of devices were also explored. Finally, the GaAs-based solar cells were actually used to fabricate a module of portable power source. Furthermore, the performance of the portable power source constructed by GaAs-based solar cell was compared with that built by commercial Si-based solar cells.
Ou, Rong-Shyang, and 歐榮祥. "Design and Implementation of a DSP-Based Programmable AC Power Source with Low Harmonic Distortion Using Repetitive Control Theory." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/78409312176855470687.
Повний текст джерела國立交通大學
控制工程系
82
The purpose of this theis is to analyze and implement an ac power source system based on digital signal processors (DSP) usingthe repetitive control algorithm. (1) To established a mathematic model of a PWM controlled inverter system.Authors have investigated the reason why the output waveform of an ac power sourcemay be distorted due to connected nonlinear loads. Much previous research was explored from the standpoint of instant-command tracking and steady- state regulation. A PWM inverter was model by its dynamic equations and the optimal state feedback method was investigated to govern the transient response of the ac source systems. (2) To propose a control strategy and an algorithm for ac voltage regulation of a PWM inverter. According to the built control system, a repetitive control strategy was proposed to improve the steady-state reponse under the assumption of periodic disturbances. Authos discussed a sufficient condition of the stability of the repetitive control system and the convergence of the error induced by periodic disturbances from the Nyquist criterion in discrete-time domain. Under this sufficient condition, the response to harmonic inputs and to non-harmonic inputs could be predicted. (3) To design a TMS320C14 DSP-basd control board. The TMS320C14 control board included an eight-channel A/D converter and memory devices. In this control board, PWM switching signals and feedback signals can communicate between the digital controller and the power stage. The read-write memory device was needed for the implement of the time-delay function in the repetitive control system. A numverical realization of the repetitive control algorithm applied on the control of a PWM inverter has been presented. According to the characteristics of the well-design servo control system, all of the blocks in the repetitive control system can be determined from the sufficient condition.