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Dissertations / Theses on the topic 'Direct Digital Synthesis'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

McEwan, Alistair. "Direct digital synthesis by analogue interpolation." Thesis, University of Oxford, 2004. http://ora.ox.ac.uk/objects/uuid:3def187d-5172-463c-9498-55898782f663.

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An improvement in efficiency of direct digital frequency synthesis (DDFS) systems is demanded for low power frequency synthesis in wireless communications. Concurrently a reduction in cost is important for disposable, low resolution frequency synthesis in biomedical instrumentation systems. To meet both these needs a new ROM-less architecture is presented here that uses less than half the circuit area of previous state of the art systems and improves the efficiency by operating at up to a tenth of the power consumption. The main contribution presented in this thesis is a novel, efficient metho

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2

Shankar, Udaya. "Implementation of digital modulation techniques using direct digital synthesis." Master's thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-03302010-020333/.

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3

Pitchford, Randall S. "Telemetry Simulation Using Direct Digital Synthesis Techniques." International Foundation for Telemetering, 1990. http://hdl.handle.net/10150/613393.

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International Telemetering Conference Proceedings / October 29-November 02, 1990 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Direct digital synthesis technology has been employed in the development of a telemetry data simulator constructed for the Western Space and Missile Center (WSMC). The telemetry simulator, known as TDVS II, is briefly described to provide background; however, the principal subject is related to the development of programmable synthesizer modules employed in the TDVS II system. The programmable synthesizer modules (or PSMs) utilize direct digital synthesiz

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4

Gordon, Michael. "SGLS COMMAND DATA ENCODING USING DIRECT DIGITAL SYNTHESIS." International Foundation for Telemetering, 1992. http://hdl.handle.net/10150/608937.

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International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, California<br>The Space Ground Link Subsystem (SGLS) provides full duplex communications for commanding, tracking, telemetry and ranging between spacecraft and ground stations. The up-link command signal is an S-Band carrier phase modulated with the frequency shift keyed (FSK) command data. The command data format is a ternary (S, 1, 0) signal. Command data rates of 1, 2, and 10 Kbps are used. The method presented uses direct digital synthesis (DDS) to generat

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5

Olsen, James Jonathan. "Phase truncation effects in direct digital frequency synthesis." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15115.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1985.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.<br>Bibliography: leaf 63.<br>by James Jonathan Olsen.<br>M.S.

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6

Källström, Petter. "Direct Digital Frequency Synthesis in Field-Programmable Gate Arrays." Thesis, Linköping University, Department of Electrical Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-56550.

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<p>This thesis is about creation of a Matlab program that suggests and automatically generates a Phase to Sine Amplitude Converter (PSAC) in the hardware language VHDL, suitable for Direct Digital Frequency Synthesis (DDFS). Main hardware target is Field Programmable Gate Arrays (FPGAs).</p><p>Focus in this report is how an FPGA works, different methods for sine amplitude generation and their signal qualities vs the hardware resources they use.</p><br><p>Detta exjobb handlar om att skapa ett Matlab-program som föreslår och implementerar en sinusgenerator i hårdvaruspråket VHDL, avsedd för digi

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7

Jones, William John. "Direct frequency synthesis using combined digital and analogue techniques." Thesis, University of Bradford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336118.

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8

Shen, Jennifer H. (Jennifer Hon-Chien). "Asynchronous direct digital synthesis modulator implemented on a FPGA." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43567.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.<br>Includes bibliographical references (leaves 51-52).<br>by Jennifer H. Shen.<br>M.Eng.

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9

Owen, Jonathan, Brandon Ravenscroft, Kai Gustafson, and Amanda Hellberg. "Ultrasonic Transmitter Implemented on Arduino with Direct Digital Synthesis." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596454.

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ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NV<br>Ultrasonic frequency signals can be employed in a manner similar to radio frequency signals for target detection and ranging by utilizing concepts from radar systems. This project uses components operating in the ultrasonic frequency spectrum to transmit and receive signals for detection and ranging. The project concept contains a single channel ultrasonic transmitter and a single channel ultrason

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10

Bozic, Milos. "Suppression techniques of unwanted spurious frequency components in direct digital frequency synthesis." Thesis, University of Bradford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385596.

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11

Burgess, George, and William Murphy. "CARRIER PHASE MODULATION USING DIRECT DIGITAL SYNTHESIS FOR AN S-BAND UPLINK." International Foundation for Telemetering, 1991. http://hdl.handle.net/10150/613115.

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International Telemetering Conference Proceedings / November 04-07, 1991 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Phase modulation has traditionally been performed in analog hardware. A new product will be described that implements this function using a phase-modulating NCO IC. The modulating signal is sampled and added digitally to the phase of the carrier generated by the NCO. This method produces an output spectrum with highly accurate modulation control, low spur levels and minimal distortion. The effects of generating sampled phase-modulated signals will be described. T

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12

Kazancioglu, Ugur. "The Implementation Of A Direct Digital Synthesis Based Function Generator Using Systemc And Vhdl." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608200/index.pdf.

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In this thesis, a direct digital synthesis (DDS) based function generator design module is presented, defined and implemented using two digital hardware modeling/design languages namely SystemC and VHDL. The simulation, synthesis and applicability performances of these two design languages are compared by following all digital hardware design stages. The advantages and open issues of SystemC based hardware design flow are emphasized in order to be a reference for future studies. SystemC initially appeared as a modeling language like HDL design languages. In the last years, SystemC gained pop

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13

Leitner, Stefan. "DESIGN TECHNIQUES FOR DIRECT DIGITAL SYNTHESIS CIRCUITS WITH IMPROVED FREQUENCY ACCURACY OVER WIDE FREQUENCY RANGES." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/2039.

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This thesis investigates efficient circuit techniques to synthesize sinusoidal signals with extremely wide programmable frequency range, from DC to the Niquist Frequency with a 100MHz system clock. In practice it is often preferred to limit the output frequencies to one third of the clock frequency. The developed techniques target sensor self-testing and impedance sensing applications. Different from most existing direct digital synthesis works, which primarily target communication applications, requiring narrow frequency range but demanding small phase jitters, this work focuses on circuit t

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14

Licari, Frank G. "A Programmable Pulse Generator for In-Vitro Neurophysiologic Experiments." University of Toledo / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1179278911.

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15

Axtell, Harold Scott. "Characterization and Design of a Completely Parameterizable VHDL Digital Single Sideband Modulator Circuit for Quick Implementation in FPGA or ASIC Electronic Warfare Platforms." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1284754385.

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16

Yuhong, Zhu, Kou Yanhong, Chang Qing, and Zhang Qishan. "HARDWARE DESIGN AND IMPLEMENTATION OFA MULTI-CHANNEL GPS SIMULATOR." International Foundation for Telemetering, 2004. http://hdl.handle.net/10150/605797.

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International Telemetering Conference Proceedings / October 18-21, 2004 / Town & Country Resort, San Diego, California<br>Hardware architecture and design details of a multi-channel GPS signal simulator with highly flexibility is presented, while the dynamic performance objectives and the requirements on the hardware architecture are discussed. The IF part of the simulator is implemented almost entirely in the digital domain by use of a field programmable gate array (FPGA), which mainly include C/A code generators, carrier generators, spreaders, and BPSK modulators. The results of testing the

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17

O'Cull, Douglas C. "TELEMETRY SIMULATOR PROVIDES PRE-MISSION VERIFICATION OF TELEMETRY RECEIVE SYSTEM." International Foundation for Telemetering, 1994. http://hdl.handle.net/10150/608548.

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International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California<br>With the increased concerns for reducing cost and improving reliability in today's telemetry systems, many users are employing simulation and automation to guarantee reliable telemetry systems operation. Pre-Mission simulation of the telemetry system will reduce the cost associated with a loss of mission data. In order to guarantee the integrity of the receive system, the user must be able to simulate several conditions of the transmitted signal.

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18

Dluhý, Vojtěch. "Přímý číslicový syntezátor pro mikrovlnné aplikace." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-220883.

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The aim of this thesis is introduce readers to the basics of digital frequency synthesis and design of direct digital synthesizer with circuit AD9951 by Analog Devices. The device will be controlled from a PC via RS232. The device will work with internal oscillator, with the ability to connect an external frequency standard.

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19

Thuries, Stéphane. "Conception et intégration d'un synthétiseur digital direct micro-onde en technologie silicium SiGe : C 0.25um." Toulouse 3, 2006. http://www.theses.fr/2006TOU30163.

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Cette thèse présente le travail effectué sur la conception d'un synthétiseur de fréquence entièrement numérique appelé Synthétiseur Digital Direct (DDS), dans la gamme micro-ondes, et en technologie BiCMOS SiGe. Ce DDS a pour objectif de se substituer aux synthèses de fréquences indirectes notamment basées sur des boucles à verrouillage de phase (PLL). Jusqu'à présent, le coût, la consommation, la surface d'intégration et la gamme de fréquences synthétisables des DDS étaient des facteurs limitants pour les applications du domaine micro-onde. Nous présentons dans cette thèse des techniques de c

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20

Rieser, Christian James. "Design and Implementation of a Swept Time Delay Short Pulse (SSTDSP) Wireless Channel Sounder for LMDS." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/35113.

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<p> This thesis describes the theoretical development, design, and implementation of a novel measurement system, called a Sampling Swept Time Delay Short Pulse (SSTDSP) wireless channel sounder, capable of real time in field performance characterization of high speed fixed wireless links. The SSTDSP sounder has been designed to provide vital performance metrics for fixed point high data rate applications in the 28 GHz LMDS band at a fraction of the cost and complexity of existing wideband channel sounders. <p> The SSTDSP sounder monitors the behavior of the LMDS channel by sampling the impulse

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21

Hordeski, Theodore J. "Digital FSK/AM/PM Sub-Carrier Modulator on a 6U-VME-Card." International Foundation for Telemetering, 1996. http://hdl.handle.net/10150/611475.

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International Telemetering Conference Proceedings / October 28-31, 1996 / Town and Country Hotel and Convention Center, San Diego, California<br>Aerospace Report No. TOR-0059(6110-01)-3, section 1.3.3 outlines the design and performance requirements of SGLS (Space Ground Link Subsystem) uplink services equipment. This modulation system finds application in the U.S. Air Force satellite uplink commanding system. The SGLS signal generator is specified as an FSK (Frequency Shift Keyed)/AM (Amplitude Modulation)/PM (Phase Modulation) sub-carrier modulator. GDP Space Systems has implemented, on a si

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22

Van, Rooyen Gert-Jan. "Baseband compensation principles for defects in quadrature signal conversion and processing." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49869.

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Thesis (PhD)--University of Stellenbosch, 2005.<br>ENGLISH ABSTRACT: Keywords: software-defined radio, SDR, quadrature mixing, quadrature modulation, quadrature demodulation, digital compensation, software radio, direct-digital synthesis, DDS. An often-stated goal of software-defined transceiver systems is to perform digital signal conversion as close to the antenna as possible by using high-rate converters. In this dissertation, alternative design principles are proposed, and it is shown that the signal processing techniques based on these principles improve on the prior system's accura

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23

Галенда, Богдан Володимирович, та Bohdan Halenda. "Розробка цифрового DDS генератора в діапазоні частот 0,2Гц-10МГц". Bachelor's thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2021. http://elartu.tntu.edu.ua/handle/lib/35491.

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У дані кваліфікаційні роботі було проведено розробку цифрового DDS генератор в діапазоні частот 0,2Гц-10МГц. Основні техніко - експлуатаційні характеристики: діапазон частот 0,2Гц-10МГц; роздільна здатність 0,1Гц; форма сигналу: шим, пила синусоїда,меандр; живлення від шини USB. Була розроблена конструкторська документація, наведені розрахунки окремих каскадів.<br>In these qualifying works, a digital DDS generator in the frequency range 0.2Hz-10MHz was developed. Main technical and operational characteristics: frequency range 0.2Hz-10MHz; 0.1 Hz resolution; signal shape: shim, sinusoidal saw,

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24

Spáčil, Jan. "Komunikační systémy s digitálními modulacemi." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217453.

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The purpose of this semestral project is to explain the basic issues of simple digital modulations through the creation of simple digital modulations using direct digital synthesis. It begins with a short review of digital modulation theory and the theory about direct digital synthesis. All the technical documentation is attached, including schematics and boards of functional modulator.

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25

Svoboda, Josef. "Přímý číslicový frekvenční syntezátor." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217986.

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Direct Digital Frequency Synthesis (DDFS) is a method of producing an analog waveform, usually a sine wave, by generating a time varying signal in digital form a then performing a digital to analog conversion. Because operations within a DDFS device are primarily digital, it can offer fast switching between output frequencies, fine frequency resolution and operation over a broad spectrum of frequencies.

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26

Girija, Satyanarayana, and J. Girija. "PC- Based S-Band Down Converter / FM Telemetry Receivers." International Foundation for Telemetering, 1996. http://hdl.handle.net/10150/611444.

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International Telemetering Conference Proceedings / October 28-31, 1996 / Town and Country Hotel and Convention Center, San Diego, California<br>In this paper design and development of a PC- Based S- Band Down Converter/ FM Telemetry Receiver are discussed. With the advent of Direct Digital Synthesis (DDS) & Phase Locked Loop (PLL) technology, availability of GaAs & Silicon MMICs, Coaxial Resonator Oscillator (CRO), SAW Oscillator, SAW Filters and Ceramic Filters, realisation of single card PC- Based Down Converter and Telemetry Receiver has become a reality. With the availability of Direct Di

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27

Lapčík, Josef. "Kmitočtové syntezátory." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219149.

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This diploma thesis concerns with analysis and dividing of frequency synthesizers and design of DDS, PLL synthesizers. Base types of frequency synthesizers are described including differences between methods of their operation. Base circuits of both – DDS and PLL synthesizers and other important circuits are described in details at design part of this thesis. Design of DDS and PLL synthesizer is described in particular sections. Both synthesizers are directly realized and stand-alone control applications are created. PLL synthesizer is also ready to control thru Agilent VEE program environment

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28

Walek, Petr. "Magnetoterapeutický přístroj pro léčbu dětské mozkové obrny." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218726.

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Project Magnetotherapeutic device for Child Neurology in his forepart paies medical use of Pulsatile Magnetic Field. Summaries a therapeutic effects of field which is interacting with biotic issue and determines which of those effects are acceptable for treatment of Infantile Paralysis. Below it describes single Bio-Parametres of Pulsatile Magnetic Field and analyses reasons and effects of Infantile Paralysis. In second part is described a block diagram of magnetotherapeutic device for treatment of Infantile Paralysis. Described is principle of function of blocks. In third part is defined circ

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29

Maréchal, Baptiste. "Microsystèmes inertiels vibrants pour applications spatiales : apport des fonctions numériques." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT265/document.

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L’Onera développe des capteurs inertiels MEMS vibrants avec des performances qui peuvent intéresser des applications spatiales. Les électroniques analogiques traditionnellement associées ne sont à priori pas limitantes par rapport aux performances physiques des capteurs. En revanche, elles se montrent encombrantes, non reconfigurables, et ne délivrent pas les grandeurs mesurées sous forme numérique à l’ordinateur de bord. En outre,dans le cadre d’une utilisation spatiale, elles sont sujettes à dépendance et à obsolescence :le remplacement d’un composant implique une nouvelle qualification.Cett

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30

Yang, Dayu Dai Foster. "Frequency syntheses with delta-sigma modulations and their applications for mixed signal testing." Auburn, Ala., 2006. http://hdl.handle.net/10415/1294.

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31

Kováč, Marek. "Digitální AM/FM vysílač." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220601.

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This master thesis is focused on the theoretical description and practical implementation of software defined transmitter. The main aim of this thesis was made the prototype of software defined transmitter in FM band. Theoretical part is determined to description of basic parts of equipment and working principles to understand the basic principle of digital transmitters and define the appropriate component base for construction. Discussed are used types of A/D and D/A converters, blocks of digital signal processing and the roles, which these components performs. The second part is focused prac

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32

Kratochvíl, Petr. "Generátor přesného kmitočtu - DDS." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217814.

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This work deals with frequency generators based on the direct digital synthesis method DDS. Basic principles and attributes of the frequency generator DDS are explained. The text describes parameters influencing and defining a quality of the generated signal. The list of available integrated circuits realizing the direct digital synthesis is mentioned. A construction of the DDS generator with a device AD9954 and the generator control are described. At the end of the work, the function and parameters of the designed generator are verified.

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33

Kang, Chang Yong. "CORDIC-based high-speed direct digital frequency synthesis." Thesis, 2003. http://hdl.handle.net/2152/687.

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Kang, Chang Yong Swartzlander Earl E. "CORDIC-based high-speed direct digital frequency synthesis." 2003. http://wwwlib.umi.com/cr/utexas/fullcit?p3116096.

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35

Reddy, T. Mohan. "Capacity and Life Estimation of Flooded Lead Acid Batteries using Eddy Current Sensors." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/2971.

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Lead acid batteries are widely used in domestic, industrial and automotive applications. Even after lot of advancements in battery technologies, lead acid cells are still in use because of their high capacity and low cost. To use any battery effectively, first we should be able to identify the available capacity or State of Charge (SoC). There are many techniques available to measure SoC of a lead acid battery. One such unique method is to measure the capacity using eddy current sensors. This method is unique because it is non-obtrusive and online. Eddy current sensors (ECS) are wire wound ind

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Reddy, T. Mohan. "Capacity and Life Estimation of Flooded Lead Acid Batteries using Eddy Current Sensors." Thesis, 2016. http://etd.iisc.ernet.in/handle/2005/2971.

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Lead acid batteries are widely used in domestic, industrial and automotive applications. Even after lot of advancements in battery technologies, lead acid cells are still in use because of their high capacity and low cost. To use any battery effectively, first we should be able to identify the available capacity or State of Charge (SoC). There are many techniques available to measure SoC of a lead acid battery. One such unique method is to measure the capacity using eddy current sensors. This method is unique because it is non-obtrusive and online. Eddy current sensors (ECS) are wire wound ind

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37

Jarvis, Thomas William. "Novel tools for ultrafast spectroscopy." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-12-4456.

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Exciton dynamics in semiconductor nanostructures are dominated by the effects of many-body physics. The application of coherent spectroscopic tools, such as two-dimensional Fourier transform spectroscopy (2dFTS), to the study of these systems can reveal signatures of these effects, and in combination with sophisticated theoretical modeling, can lead to more complete understanding of the behaviour of these systems. 2dFTS has previously been applied to the study of GaAs quantum well samples. In this thesis, we outline a precis of the technique before describing our own experiments using 2dFTS

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