Academic literature on the topic 'Inductor design'
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Journal articles on the topic "Inductor design"
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Gao, Song. "Coupled Inductor Design of Contactless Power Transfer System." Advanced Materials Research 503-504 (April 2012): 1190–93. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.1190.
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Paper introduces a high-frequency electromagnetic induction coupling principle to achieve contactless power transfer system, and analyzes the role of the coupled inductor coil in the system. By studying a variety of coupled inductor coil winding mode coupling theory, comparing the receiver coil movable range and the coil geometry size, this paper analyzes the pros and cons of the various coil mode in certain applications and sums up the general law the winding-coupled inductors to be considered and followed.
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Lazarus, Nathan, Chris D. Meyer, and Sarah S. Bedair. "Stretchable Inductor Design." IEEE Transactions on Electron Devices 62, no. 7 (July 2015): 2270–77. http://dx.doi.org/10.1109/ted.2015.2431221.
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Farooq, Muhammad, Bilal Amin, Adnan Elahi, William Wijns, and Atif Shahzad. "Planar Elliptical Inductor Design for Wireless Implantable Medical Devices." Bioengineering 10, no. 2 (January 23, 2023): 151. http://dx.doi.org/10.3390/bioengineering10020151.
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Wireless implantable medical devices (WIMDs) have seen unprecedented progress in the past three decades. WIMDs help clinicians in better-understanding diseases and enhance medical treatment by allowing for remote data collection and delivering tailored patient care. The wireless connectivity range between the external reader and the implanted device is considered one of the key design parameters in WIMD technology. One of the common modes of communication in battery-free WIMDs is inductive coupling, where the power and data between the reader and the implanted device are transmitted via magnetically coupled inductors. The design and shape of these inductors depend on the requirements of the application. Several studies have reported models of standard planar inductors such as circular, square, hexagonal, and octagonal in medical applications. However, for applications, constrained by narrow implantable locations, elliptical planar inductors may perform better than standard-shaped planar inductors. The aim of this study is to develop a numerical model for elliptical inductors. This model allows for the calculation of the inductance of the elliptical planar inductor and its parasitic components, which are key design parameters for the development of WIMDs powered by inductive coupling. An area transformation technique is used to transform and derive elliptical inductor formulas from standard circular inductor formulas. The proposed model is validated for various combinations of the number of turns, trace width, trace separation, and different inner and outer diameters of the elliptical planar inductor. For a thorough experimental validation of the proposed numerical model, more than 75 elliptical planar inductors were fabricated, measured, and compared with the numerical output of the proposed model. The mean error between the measured inductor parameters and numerical estimates using the proposed model is <5%, with a standard deviation of <3.18%. The proposed model provides an accurate analytical method for estimating and optimizing elliptical planar inductor parameters using a combination of current sheet expression and area transformation techniques. An elliptical planar inductor integrated with a sensing element can be used as a wireless implant to monitor the physiological signal from narrow implantation sites.
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Stojanovic, Goran, Ljiljana Zivanov, and Mirjana Damnjanovic. "Optimal design of circular inductors." Facta universitatis - series: Electronics and Energetics 18, no. 1 (2005): 57–70. http://dx.doi.org/10.2298/fuee0501057s.
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The scope of this work is to introduce a software tool for optimization of circular spiral inductors. It is based on compact model, where the physical behavior is described through analytical expressions in geometric programming (GP) form. This paper describes three significant innovations (a) optimization of circular inductor via GP, (b) new expressions for inductance and Q-factor in GP form, (c) globally optimal trade-off curves between maximum self-resonant frequency and inductance values or minimum inductor area and inductance values. The proposed optimization algorithm is flexible because the designers of RF integrated circuits can easily optimize the circular inductor for a desired performance.
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Novickij, J., and N. Višniakov. "The Application of Composite Materials in Pulsed Inductor Design." Solid State Phenomena 113 (June 2006): 545–48. http://dx.doi.org/10.4028/www.scientific.net/ssp.113.545.
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The multilayer construction of metal-matrix Cu-Nb microcomposite wire wound Zylon-epoxy composite reinforced inductor is analyzed. Inductor geometry was verified analytically to find the maximal available value of a magnetic field. For comparison, the soft copper wire wound inductor was made by the same geometry and technology and both inductors were investigated at room and liquid nitrogen temperatures. Experimental results were compared with calculated data. The acceptable agreement of calculated and measured data for soft copper wire wound inductor and the significant decrease of amplitude and distortions of sinus shape pulse due to weak heat dissipation of metal-matrix Cu-Nb wire wound inductor took place.
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Muneeswaran, Dhamodaran, Jegadeesan Subramani, Thanapal Pandi, Navaneethan Chenniappan, and Meenatchi Shanmugam. "Modelling of Different On-chip Inductors for Radio Frequency Integrated Circuits." Proceedings of the Bulgarian Academy of Sciences 75, no. 10 (October 30, 2022): 1491–98. http://dx.doi.org/10.7546/crabs.2022.10.12.
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This paper presents a typical frequency-dependent modelling of different on-chip inductors for RFICs design problems. Modern RF circuits often feature on-chip inductors required by modern circuit design. A comparison of different inductor geometrics includes a planar spiral inductor and novel multilayer inductors are analyzed. An electromagnetic model with fewer assumptions than empirical equations and higher efficiency than full-field solvers would be welcome. So would facile comparisons of different inductor structures. This paper describes recent work on the electromagnetic modelling of on-chip inductor structures, applied to the comparison of inductor geometries, including the traditional spiral inductor and a novel multilayer inductor. The electromagnetic modelling of the investigative model is also presented.
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Stupin, A. O., D. V. Rogova, E. A. Nozdrenko, V. V. Kukartsev, A. I. Cherepanov, and A. E. Stashkevich. "Design of inductors for the installation of induction soldering of pipeline joints in the oil and gas industry." Journal of Physics: Conference Series 2094, no. 4 (November 1, 2021): 042017. http://dx.doi.org/10.1088/1742-6596/2094/4/042017.
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Abstract The article discusses the use of induction brazing for connecting oil and gas pipelines. The rationale for the choice of induction brazing in the oil and gas industry is considered. The work calculates the main parameters of the inductor. On the basis of calculations, using a mathematical apparatus, a schematic diagram of an inductor with a diameter of 90 mm is created for installing induction soldering. It is proposed to use and develop inductors of various diameters (60, 90 and 135 mm) to create an induction unit that allows connecting pipelines of oil and gas equipment in order to increase the reliability of equipment and the efficiency of oil and gas production and processing.
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Min, Jinkun, Guangyu Zhu, Yidan Yuan, and Jingquan Liu. "COMSOL Simulation for Design of Induction Heating System in VULCAN Facility." Science and Technology of Nuclear Installations 2021 (August 19, 2021): 1–12. http://dx.doi.org/10.1155/2021/9922503.
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The experimental facility VULCAN was setup to study the fuel-coolant interaction (FCI) phenomena in a postulated severe accident of light water reactors. The heating system is important for the facility to prepare molten material in a crucible. This article is concerned with the design of the heating system, which applies electromagnetic induction heating method. The COMSOL code was employed to simulate the induction heating characteristics of a graphite crucible under different current and frequency of the work coil (inductor). Given a frequency, the relationship between the crucible’s average temperature and the inductor’s current is obtained, which is instrumental to select the power supply of the induction heating system. Meanwhile, the skin effect of induction heating is analyzed to guide the choice of frequency and inductor of the heating system. According to the simulation results, the induction heating system of frequency 47 kHz is suitable for the experiment, with a good agreement in temperature between the measured and the predicted.
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Boo, K. K., Ovinis Mark, and Nagarajan Thirumalaiswamy. "Thermal and Magnetisms Design of an Inductor Using Finite Element Method." Advanced Materials Research 622-623 (December 2012): 130–35. http://dx.doi.org/10.4028/www.scientific.net/amr.622-623.130.
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Thermal stress points in an inductor can cause insulation deterioration and ageing, leading to winding faults, while high magnetic flux causes interference. In this paper, the thermal and magnetic behaviors of inductors with different winding geometries are investigated using the Finite Element Method (FEM) based on 2-Dimension and 3-Dimension model of an inductor. Inductors with different winding geometries have different thermal envelopes and the geometry with the slowest thermal transition has fewer thermal stress points potentially reducing winding faults at the conductor. Furthermore, slow thermal transition would result in greater magnetic field coverage with no magnetic flux outside boundary of the inductor.
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Tacca, Hernan Emilio. "Ferrite Toroidal Inductor Design." IEEE Latin America Transactions 7, no. 6 (December 2009): 630–35. http://dx.doi.org/10.1109/tla.2009.5419359.
Full textDissertations / Theses on the topic "Inductor design"
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Saeed, Rasha. "Design and characterisation of a high energy-density inductor." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/49726/.
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Power electronics is an enabler for the low-carbon economy, delivering flexible and efficient control and conversion of electrical energy in support of renewable energy technologies, transport electrification and smart grids. Reduced costs, increased efficiency and high power densities are the main drivers for future power electronic systems, demanding innovation in materials, component technologies, converter architectures and control. Power electronic systems utilise semiconductor switches and energy storage devices, such as capacitors and inductors to realise their primary function of energy conversion. Presently, roughly 50% of the volume of a typical power electronic converter is taken up by the energy storage components, so reducing their weight and volume can help to reduce overall costs and increase power densities. In addition, the energy storage densities of inductors are typically much lower than those of capacitors, providing a compelling incentive to investigate techniques for improvement. The main goal of this research was to improve the design of an inductor in order to achieve higher energy densities by combining significantly increased current densities in the inductor windings with the ability to limit the temperature increase of the inductor through a highly effective cooling system. Through careful optimisation of the magnetic, electrical and thermal design a current density of 46 A/mm2 was shown to be sustainable, yielding an energy storage density of 0.537 J/ kg. A principal target for this enhanced inductor technology was to achieve a high enough energy density to enable it to be readily integrated within a power module and so take a step towards a fully-integrated “converter in package” concept. The research included the influence of the operating dc current, current ripple, airgap location and operating frequency on the inductor design and its resulting characteristics. High frequency analysis was performed using an improved equivalent circuit, allowing the physical structure of the inductor to be directly related to the circuit parameters. These studies were validated by detailed small-signal ac measurements. The large signal characteristics of the inductor were determined under conditions of triangular, high-frequency current as a function of frequency, current (flux) ripple amplitude and dc bias current (flux) and a model developed allowing the inductor losses to be predicted under typical power electronic operating conditions.
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Yang, Rachel S. (Rachel Shanting). "Low-loss inductor design for high-frequency power applications." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/123006.
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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2019
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 72-74).
Miniaturization of power electronics can improve the performance of many applications, such as renewable energy systems, data centers, and aerospace systems. Operation in the high frequency (HF) regime (3{ 30 MHz) has potential for miniaturizing power electronics, but designing small, efficient inductors at HF can be challenging. At these frequencies, losses due to skin and proximity effects are difficult to reduce, and gaps needed to keep B fields low in the core add fringing field loss. This thesis aims to improve the design of HF inductors. A low-loss inductor structure for HF applications and associated design guidelines that optimize for loss have been developed. The structure achieves low loss through quasi-distributed gaps and a new field shaping technique that achieves low winding loss through double-sided conduction. An example ~15 [mu]H inductor designed using the proposed guidelines achieved an experimental quality factor of 720 at 3MHz and 2A (peak) of ac current.
In some cases, litz wire may further improve the performance of the proposed structure. With litz wire, the example inductor achieved an improved quality factor of 980. The proposed structure also has great design and application flexibility. Core sets for this structure can be scaled by a factor-of-four in volume and still cover a large, continuous range of inductor requirements, e.g. power handling and inductances. A wide range of requirements can therefore be achieved with a small set of core pieces. The proposed inductor structure and design techniques thus have greater potential for commercial adoption to facilitate the design of low-loss HF inductors. The design techniques used in the proposed structure can also be extended to high-power radio-frequency (RF) applications, such as RF power amplifiers for industrial plasma generation. A modified version of the proposed structure, along with modified design guidelines, can achieve low loss in this operating space.
Simulations show that an example ~600 nH inductor achieves a quality factor of 1900 at 13:56MHz and 78A (peak). Therefore, the developed design techniques and inductor structures are suitable for small, highly-efficient inductors at HF, and can thereby help realize high-frequency miniaturization of power electronics.
by Rachel S. Yang.
M. Eng.
M.Eng. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science
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Butler, Stephen J. "Analysis and design of a low-ripple coupled-inductor boost topology." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-10312009-020328/.
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Chen, Ji. "ON-CHIP SPIRAL INDUCTOR/TRANSFORMER DESIGN AND MODELING FOR RF APPLICATIONS." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4115.
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Passive components are indispensable in the design and development of microchips for high-frequency applications. Inductors in particular are used frequently in radio frequency (RF) IC's such as low-noise amplifiers and oscillators. High performance inductor has become one of the critical components for voltage controlled oscillator (VCO) design, for its quality factor (Q) value directly affects the VCO phase noise. The optimization of inductor layout can improve its performance, but the improvement is limited by selected technology. Inductor performance is bounded by the thin routing metal and small distance from lossy substrate. On the other hand, the in-accurate inductor modeling further limits the optimization process. The on-chip inductor has been an important research topic since it was first proposed in early 1990's. Significant amount of study has been accomplished and reported in literature; whereas some methods have been used in industry, but not released to public. It is of no doubt that a comprehensive solution is not exist yet. A comprehensive study of previous will be first address. Later author will point out the in-adequacy of skin effect and proximity effect as cause of current crowding in the inductor metal. A model method embedded with new explanation of current crowding is proposed and its applicability in differential inductor and balun is validated. This study leads to a robust optimization routine to improve inductor performance without any addition technology cost and development.Ph.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering
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Surendra, Kanchana. "Modeling and Design of a Three-dimensional Inductor with Magnetic Core." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/34565.
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As the demand for portable electronic devices increase, the need to replace off-chip discrete devices with on-chip devices is imperative. Inductors are one such passive device that is widely used in low noise amplifiers, oscillators, etc. Current on-chip spiral inductors suffer from large parasitics and area for a meager value of inductance and quality factor. The need to overcome these issues has led to the development inductors with new geometries housing magnetic cores that show an enhanced inductance compared to the air core coil.
In this thesis, we discuss the design of a three-dimensional spiral inductor with a Co-Fe nanoparticle core that will be fabricated as per the process rules set by VT MT SPL. The changes in the value of the inductance, resistance, quality factor and parasitics are studied for varying number of turns of the coil, thickness of the coil, spacing between turns and different materials used as the coil. An optimum design incorporating the least parasitics and reasonable inductance is proposed.Master of Science
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Abou, Seido Maamoun Carleton University Dissertation Engineering Electronics. "Design and analysis of CMOS monolithic inductor-less voltage controlled oscillators." Ottawa, 1996.
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Fielder, Robert Stanley. "Computer Aided Design and Fabrication of Magnetic Composite Multilayer Inductors." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/36115.
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Computer modeling using finite element analysis (FEA) was performed to examine the effects of constructing multilayered thick film inductors using an artificially modulated magnetic composite structure. It was found that selectively introducing regions of low permeability material increased both the inductance and the current carrying capacity compared to thick film inductors made with single material magnetic cores. Permeabilities of the composite cores ranged from 1 to 220. The frequency for the models ranged from 0 to 5.0 MHz. Experimental devices were constructed using thick film screen printing techniques and characterized to validate the models and to determine the effectiveness of the design modifications. Quantitative comparisons were made between inductors of single permeability cores with inductors produced with magnetic composite cores. It was found that significant (> 130%) increases could be gained in saturation current with only a 12% decrease in inductance. It was found that the key parameters affecting performance were 1) the placement of low permeability regions, 2) the extent of non-uniform flux distribution within the structure, and 3) the volume fraction of low permeability material.Master of Science
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Ayhan, Mustafa Tufan. "Design And Implementation Of Coupled Inductor Cuk Converter Operating In Continuous Conduction Mode." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613927/index.pdf.
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The study involves the following stages: First, coupled-inductor and integrated magnetic structure used in Cuk converter circuit topologies are analyzed and the necessary information about these elements in circuit design is gathered. Also, benefits of using these magnetic elements are presented. Secondlysteady-state model, dynamic model and transfer functions of coupled-inductor Cuk converter topology are obtained via state-space averaging method. Third stage deals with determining the design criteria to be fulfilled by the implemented circuit. The selection of the circuit components and the design of the coupled-inductor providing ripple-free input current waveform are performed at this stage. Fourth stage introduces the experimental results of the implemented circuit operating in open loop mode. Besides, the controller design is carried out and the closed loop performance of the implemented circuit is presented in this stage.
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Mishra, Dibyajat. "Modeling, design, fabrication and demonstration of multilayered ferromagnetic polymer-dielectric composites for ultra-thin high-denisty power inductors." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54333.
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The emerging need for smart and wearable electronic systems are driving new
electronics technology paradigms in miniaturization, functionality and
cost.The operating voltages and power levels for devices in these systems
are becoming increasingly varied with increased diversity of devices to
serve these heterogeneous functions. Power convertor technologies are
incorporated into various parts of these systems to step-up or step-down
battery voltages and currents to address these diverse needs. Hence,
multiple power converters, each requiring several passive components, are
used to create stable power-supplies. This is placing significant challenges
in ultra-miniaturized and ultra-efficient power management technologies.
A typical power convertor consists of magnetic components such as inductors
perform the basic energy storage and delivery functions from the source to
the load. These power components are still at microscale in lithography and
milliscale in component size. They occupy a large volume fraction of the
power circuitry. Power convertors therefore, are a major bottleneck to
system miniaturization. There is, thus, a need for ultra-miniaturized and
high-performance power inductors for scaling down such power convertors. The
critical parameters governing the size and performance of power inductors
are its inductance density and power handling capability. These parameters
are limited by the magnetic properties of the present inductor core
materials. A new approach to inductor cores that achieves the best magnetic
properties and yet allows integration of power inductors into ultra-thin
substrates to meet the emerging needs for performance and size is therefore
required.
The objective of this research is to model, design and synthesize a novel
multilayered ferromagnetic-polymer composite structure for inductor cores
with high permeability and saturation magnetization.The multilayered
composite structure consists of thin magnetic layers interspersed with
ultra-thin polymers. A fabrication approach to integrate the composite
structure in inductor devices is also demonstrated.
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Trulls, Fortuny Xavier. "Design of broadband inductor-less RF front-ends with high dynamic range for G.hn." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/463012.
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System-on-Chip (SoC) was adopted in recent years as one of the solutions to reduce the cost of integrated systems. When the SoC solution started to be used, the final product was actually more expensive due to lower yield. The developments in integrated technology through the years allowed the integration of more components in lesser area with a better yield. Thus, SoCs became a widely used solution to reduced the cost of the final product, integrating into a single-chip the main parts of a system: analog, digital and memory.
As integrated technology kept scaling down to allow a higher density of transistors and thus providing more functionality with the same die area, the analog RF parts of the SoC became a bottleneck to cost reduction as inductors occupy a large die area and do not scale down with technology. Hence, the trend moves toward the research and design of inductor-less SoCs that further reduce the cost of the final solution.
Also, as the demand for home networking high-data-rates communication systems has increased over the last decade, several standards have been developed to satisfy the requirements of each application, the most popular being wireless local area networks (WLANs) based on the IEEE 802.11 standard. However, poor signal propagation across walls make WLANs unsuitable for high-speed applications such as high-definition in-home video streaming, leading to the development of wired technologies using the existing in-home infrastructure. The ITU-T G.hn recommendation (G.9960 and G.9961) unifies the most widely used wired infrastructures at home (coaxial cables, phone lines and power lines) into a single standard for high-speed data transmission of up to 1 Gb/s.
The G.hn recommendation defines a unified networking over power lines, phone lines and coaxial cables with different plans for baseband and RF. The RF-coax bandplan, where this thesis is focused, uses 50 MHz and 100 MHz bandwidth channels with 256 and 512 carriers respectively. The center frequency can range from 350 MHz to 2450 MHz. The recommendation specifies a transmission power limit of 5 dBm for the 50 MHz bandplan and 8~dBm for the 100 MHz bandplan, therefore the maximum transmitted power in each carrier is the same for both bandplans.
Due to the nature of an in-home wired environment, receivers that can handle both very large and very small amplitude signals are required; when transmitter and receiver are connected on the same electric outlet there is no channel attenuation and the signal-to-noise-plus-distortion ratio (SNDR) is dominated by the receiver linearity, whereas when transmitter and receiver are several rooms apart channel attenuation is high and the SNDR is dominated by the receiver noise figure. The high dynamic range specifications for these receivers require the use of configurable-gain topologies that can provide both high-linearity and low-noise for different configurations. Thus, this thesis has been aimed at researching high dynamic range broadband inductor-less topologies to be used as the RF front-end for a G.hn receiver complying with the provided specifications.
A large part of the thesis has been focused on the design of the input amplifier of the front-end, which is the most critical stage as the noise figure and linearity of the input amplifier define the achievable overall specifications of the whole front-end. Three prototypes has been manufactured using a 65 nm CMOS process: two input RFPGAs and one front-end using the second RFPGA prototype.El "sistema en un chip" (SoC) fue adoptado recientemente como una de las soluciones para reducir el coste de sistemas integrados. Cuando se empezó a utilizar la solución SoC, el producto final era más caro debido al bajo rendimiento de producción. Los avances en tecnología integrada a lo largo de los años han permitido la integración de más componentes en menos área con mejoras en rendimiento. Por lo tanto, SoCs pasó a ser una solución ampliamente utilizada para reducir el coste del producto final, integrando en un único chip las principales partes de un sistema: analógica, digital y memoria. A medida que las tecnologías integradas se reducían en tamaño para permitir una mayor densisdad de transistores y proveer mayor funcionalidad con la misma área, las partes RF analógicas del SoC pasaron a ser la limitación en la reducción de costes ya que los inductores ocupan mucha área y no escalan con la tecnología. Por lo tanto, las tendencias en investigación se mueven hacia el diseño de SoCs sin inductores que todavía reducen más el coste final del producto. También, a medida que la demanda en sistemas de comunicación domésticos de alta velocidad ha crecido a lo largo de la última década, se han desarrollado varios estándares para satisfacer los requisitos de cada aplicación, siendo las redes sin hilos (WLANs) basadas en el estándar IEEE 802.11 las más populares. Sin embargo, una pobre propagación de señal a través de las paredes hacen que las WLANs sean inadecuadas para aplicaciones de alta-velocidad como transmisión de vídeo de alta definición en tiempo real, resultando en el desarrollo de tecnologías con hilos utilizando la infraestructura existente en los domicilios. La recomendación ITU-T G.hn (G.9960 and G.9961) unifica las principales infraestructuras con hilos domésticas (cables coaxiales, línias de teléfono y línias de electricidad) en un sólo estándar para la transmisión de datos hasta 1 Gb/s. La recomendación G.hn define una red unificada sobre línias de electricidad, de teléfono y coaxiales con diferentes esquemas para banda base y RF. El esquema RF-coax en el cual se basa esta tesis, usa canales con un ancho de banda de 50 MHz y 100 MHz con 256 y 512 portadoras respectivamente. La frecuencia centra puede variar desde 350 MHz hasta 2450 MHz. La recomendación especifica un límite en la potencia de transmisión de 5 dBm para el esquema de 50 MHz y 8 dBm para el esquema de 100 MHz, de tal forma que la potencia máxima por portadora es la misma en ambos esquemas. Debido a la estructura de un entorno doméstico con hilos, los receptores deben ser capaces de procesar señales con amplitud muy grande o muy pequeña; cuando transmisor y receptor están conectados en la misma toma eléctrica no hay atenuación de canal y el ratio de señal a rudio más distorsión (SNDR) está dominado por la linealidad del receptor, mientras que cuando transmisor y receptor están separados por varias habitaciones la atenuación es elevada y el SNDR está dominado por la figura de ruido del receptor. Los elevados requisitos de rango dinámico para este tipo de receptores requieren el uso de topologías de ganancia configurable que pueden proporcionar tanto alta linealidad como bajo ruido para diferentes configuraciones. Por lo tanto, esta tesis está encarada a la investigación de topologías sin inductores de banda ancha y elevado rango dinámico para ser usadas a la entrada de un receptor G.hn cumpliendo con las especificaciones proporcionadas. Una gran parte de la tesis se ha centrado en el diseño del amplificador de entrada al ser la etapa más crítica, ya que la figura de ruido y linealidad del amplificador de entrada definen lás máximas especificaciones que el sistema puede conseguir. Se han fabricado 3 prototipos con un proceso CMOS de 65 nm: 2 amplificadores y un sistema completo con amplificador y mezclador.
Books on the topic "Inductor design"
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Rincón-Mora, Gabriel Alfonso. Switched Inductor Power IC Design. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-030-95899-2.
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McLyman, Colonel William T. Transformer and inductor design handbook. 3rd ed. New York: Marcel Dekker, 2004.
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Sadeghian, Ali Reza. A knowledge-based expert system for inductor design. Ottawa: National Library of Canada, 1993.
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McLyman, Colonel William T. Transformer and inductor design software for the Macintosh. New York: M. Dekker, 1985.
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Casey, Ronan. A nonlinear inductor model for SPICE3e2. Dublin: University College Dublin, 1995.
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Smirnov, Aleksandr. Electric drive with contactless synchronous motors. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1192105.
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Contactless synchronous machines are considered, classification, description of structures, construction of analytical and numerical models for research calculations and design of inductor motors with electromagnetic excitation and with excitation from permanent magnets are given. Examples of design and research calculations of the operation of a synchronous drive of automation systems by means of a computational experiment are given.
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Nerg, Janne. Numerical modelling and design of static induction heating coils. Lappeenranta, Finland: Lappeenranta University of Technology, 2000.
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Marino, Riccardo, Patrizio Tomei, and Cristiano M. Verrelli. Induction Motor Control Design. London: Springer London, 2010. http://dx.doi.org/10.1007/978-1-84996-284-1.
Full textBook chapters on the topic "Inductor design"
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Erickson, Robert W., and Dragan Maksimović. "Inductor Design." In Fundamentals of Power Electronics, 539–64. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/0-306-48048-4_14.
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Erickson, Robert W., and Dragan Maksimović. "Inductor Design." In Fundamentals of Power Electronics, 459–83. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43881-4_11.
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Erickson, Robert W. "Filter Inductor Design." In Fundamentals of Power Electronics, 497–511. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-7646-4_13.
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Fluke, John C. "Inductor Modeling." In Controlling Conducted Emissions by Design, 65–81. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-7024-6_4.
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Craninckx, J., and M. Steyaert. "Planar-Inductor VCOs." In Wireless CMOS Frequency Synthesizer Design, 121–59. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-2870-5_5.
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Haobijam, Genemala, and Roy Paily Palathinkal. "Multilayer Pyramidal Symmetric Inductor." In Design and Analysis of Spiral Inductors, 53–85. New Delhi: Springer India, 2013. http://dx.doi.org/10.1007/978-81-322-1515-8_3.
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Rincón-Mora, Gabriel Alfonso. "Field-Effect Transistors." In Switched Inductor Power IC Design, 45–102. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95899-2_2.
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Rincón-Mora, Gabriel Alfonso. "Power Losses." In Switched Inductor Power IC Design, 167–240. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95899-2_4.
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Rincón-Mora, Gabriel Alfonso. "Diodes and BJTs." In Switched Inductor Power IC Design, 1–44. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95899-2_1.
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Rincón-Mora, Gabriel Alfonso. "Control Loops." In Switched Inductor Power IC Design, 373–429. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95899-2_7.
Full textConference papers on the topic "Inductor design"
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Chang, Chao-Liang, Uei-Ming Jow, Chao-Ta Huang, Hsiang-Chi Liu, Jr-Yuan Jeng, Yung-Yu Hsu, Chih-Min Yao, Ming-Hsiao Lee, Kung-Yu Tzeng, and Yu-Ching Shih. "Optimum Design of Inductors Used for Wireless Power Transmission Micro-Module." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59934.
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The micro-inductor is a key component in wireless power transmission micro modules. In this paper, an optimum design for the micro-inductor was studied and related MEMS fabrication techniques were also developed. Commercial electromagnetic property analysis software, ANSOFT, was used to screen the main design factors of the micro-inductor. It was found that the high inductance and high quality factors of the micro-inductor implied high power transmission efficiency for the micro-module’s wireless power transmission. The electrical performance of the micro-inductor was affected by the thermal stress and thermal strain induced in the operational environment of the wireless power transmission micro-module. In order to investigate the reliability of the micro-inductor, commercial stress analysis software, ANSYS, was used to calculate thermal stress and thermal strain. The deformed model of the micro-inductor was then imported into ANSOFT in order to calculate its electrical properties. Glass substrate Pyrex 7740 was used to reduce the substrate loss of the magnetic flux of the micro-inductor. The surface micromachining technique, a kind of MEMS processing, was chosen to fabricate the micro-inductor; the coil of the micro-inductor was electroplated with copper to reduce the series resistance. The minimum line width and line space of the coil were 20 μm and 20 μm respectively. Polyimide (PI) was used for supporting the structure of micro-inductors. The maximum shear stress was 74.09MPa and the maximum warpage was 2.197 μm at a thermal loading of 125°C. For the simulated data, the most suitable areas for 31-turn and 48-turn coils were at an area ratio of 1.27 and 2, respectively. The electrical properties of the inductors changed slightly under thermal loading.
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Jin, Lin, Albert Chee W. Lu, Lai L. Wai, Wei Fan, Aik Chong Tan, and Kai Chong Chan. "Design Optimization of Off-Chip Inductors." In ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35223.
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A solution space design methodology is presented for optimization of off-chip inductors. The analysis has been performed for an advanced wafer level redistribution manufacturing process. Electromagnetic simulations were performed to extract the characteristics of different inductor designs. It was observed that the design optimization should be tuned to the operating frequency.
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Muñoz, Hiram Martinez. "Analysis of Errors in Simulation Modeling." In HT2021. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.ht2021exabp0053.
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Abstract Nowadays, the use of technologies to increase productivity, reduce time, as well as reduce the possibilities of errors, has become indispensable. All processes have opportunities for improvement, and this can be done based on calculations that with the support of computational systems can be reduced considerably in time. In the heat treatment industry and more specifically in the electromagnetic induction heat treatment industry is no exception. Today we have numerous tools to optimize the design process of inductors used in heat treatment of metals. These tools can show us, in a virtual way, the results that we can obtain before having to manufacture the inductors, all this based on FEA (Finite Elements Analysis) simulations that performing calculations considering physical parameters approximate us to what we would have as a result. Computer based simulation programs for induction heating and resulting metallurgy are extremely useful in developing tooling and process for induction heating. Induction hardening simulation brings elements of inductor design, steel properties such as time-temperature-transformation curves, both thermal and magnetic properties at various temperatures and cooling rates based on the phase of the quench media on cooling. A common method in place hardening (static hardening) knows as single shot hardening. In this process, the inductor is designed with a top and bottom half loop connected by heating rails. The length of heating is determined by the length of the rails and percentage height of the width of the half loops. Accurately predicting the length of the heating pattern in this 3D modeling approach is computationally a heavy load on the modeling pre-requisites. Commonly the inductor is modeled and then tested with the actual results showing a different length than what was predicted. It is important to consider that like any system, these simulation tools are not infallible and have several factors that can affect the accuracy of the simulation results. This paper reaches into the analysis of why the predicted length may differ prom the test results discussing what factors constitute the largest variance from the predicted outcome. Inductor design and the reliance on set up will be discussed.
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Cheng, K. W. E. "High frequency inductor design for an aerospace application." In IEE Colloquium on Capacitors and Inductors for Power Electronics. IEE, 1996. http://dx.doi.org/10.1049/ic:19960345.
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Shane, G. M., and S. D. Sudhoff. "Permanent magnet inductor design." In 2011 IEEE Electric Ship Technologies Symposium (ESTS). IEEE, 2011. http://dx.doi.org/10.1109/ests.2011.5770892.
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Mrozek, Krzysztof, Roman Staniek, and Marek Szostak. "Research on External and Internal Induction Heating Effectiveness of Injection Molds by Means of Thermovision Measurements." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20317.
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The aim of this work is to compare the effectiveness of two induction heating methods of injection molds by means of thermovision measurement. The problem of selecting external or internal induction heating for thin-walled moldings used in electrical and electronic industry is taken into consideration. At first, the boundary conditions were defined. Then a group of three moldings with different defects were selected. The defects that have been taken to remove by means of induction heating are: weld lines, breaking hinges, air traps and diesel effect. In order to compare the methods of heating two models were created. The first one was made as a block of steel with milled grooves with a width of 2mm and a depth varying from 1 to 12mm. The second model consisted of two parts, one being placed in the second. The research stand consisted of prepared models, induction generator with power of 10kW, specially shaped inductor, thermovision camera and temperature sensor of PT100 type as a reference. First, the surface with milled grooves was heated in four different sectors (because of the shape of inductor) in time of 2s. The area of low-depth grooves heated up to 154°C while the surface with 12 mm grooves heated up to 120°C. It comes from eddy currents flowing. This phenomenon shows that effectiveness of external heating of grooved surface decreases with increasing of grooves depth. In the second case the cavity insert was heated as a coil inside the inductor which was located inside the mold. The measured value was the time of heat transfer from heated area to the forming surface in three configurations.
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Qiu, Jizheng, and Charles R. Sullivan. "Inductor design for VHF tapped-inductor dc-dc power converters." In 2011 IEEE Applied Power Electronics Conference and Exposition - APEC 2011. IEEE, 2011. http://dx.doi.org/10.1109/apec.2011.5744588.
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Amirpour, Mostafa, Saeed Akbari, Ebrahim Abbaspour Sani, and Mohammad N. Azarmanesh. "Varactor based tunable inductor design." In 2015 23rd Iranian Conference on Electrical Engineering (ICEE). IEEE, 2015. http://dx.doi.org/10.1109/iraniancee.2015.7146443.
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Matsuki, H., H. Miyazawa, K. Nadehara, M. Yamaguchi, K. Murakami, and T. Yamamoto. "Design of miniaturized cloth inductor." In International Magnetics Conference. IEEE, 1989. http://dx.doi.org/10.1109/intmag.1989.690273.
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Cuk, Slobodan, and Zhe Zhang. "Coupled-inductor analysis and design." In 1986 17th Annual IEEE Power Electronics Specialists Conference. IEEE, 1986. http://dx.doi.org/10.1109/pesc.1986.7415621.
Full textReports on the topic "Inductor design"
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Witt, D. C. Americium-Curium Stabilization - 5'' Cylindrical Induction Melter System Design Basis. Office of Scientific and Technical Information (OSTI), November 1999. http://dx.doi.org/10.2172/14750.
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Ekdahl, Carl August. Scaling of induction-cell transverse impedance: effect on accelerator design. Office of Scientific and Technical Information (OSTI), August 2016. http://dx.doi.org/10.2172/1296655.
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Kirkendall, B. A., J. P. Lewis, S. L. Hunter, and P. E. Harben. Progress in crosswell induction imaging for EOR: field system design and field testing. Office of Scientific and Technical Information (OSTI), March 1999. http://dx.doi.org/10.2172/14661.
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Fink, Bruce K., Shridhar Yarlagadda, John W. Gillespie, and Jr. Design of a Resistive Susceptor for Uniform Heating During Induction Bonding of Composites. Fort Belvoir, VA: Defense Technical Information Center, January 2000. http://dx.doi.org/10.21236/ada373381.
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Wilson, Thomas E., Avraham A. Levy, and Tzvi Tzfira. Controlling Early Stages of DNA Repair for Gene-targeting Enhancement in Plants. United States Department of Agriculture, March 2012. http://dx.doi.org/10.32747/2012.7697124.bard.
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Gene targeting (GT) is a much needed technology as a tool for plant research and for the precise engineering of crop species. Recent advances in this field have shown that the presence of a DNA double-strand break (DSB) in a genomic locus is critical for the integration of an exogenous DNA molecule introduced into this locus. This integration can occur via either non-homologous end joining (NHEJ) into the break or homologous recombination (HR) between the broken genomic DNA and the introduced vector. A bottleneck for DNA integration via HR is the machinery responsible for homology search and strand invasion. Important proteins in this pathway are Rad51, Rad52 and Rad54. We proposed to combine our respective expertise: on the US side, in the design of zincfinger nucleases (ZFNs) for the induction of DNA DSBs at any desired genomic locus and in the integration of DNA molecules via NHEJ; and on the Israeli side in the HR events, downstream of the DSB, that lead to homology search and strand invasion. We sought to test three major pathways of targeted DNA integration: (i) integration by NHEJ into DSBs induced at desired sites by specially designed ZFNs; (ii) integration into DSBs induced at desired sites combined with the use of Rad51, Rad52 and Rad54 proteins to maximize the chances for efficient and precise HR-mediated vector insertion; (iii) stimulation of HR by Rad51, Rad52 and Rad54 in the absence of DSB induction. We also proposed to study the formation of dsT-DNA molecules during the transformation of plant cells. dsT-DNA molecules are an important substrate for HR and NHEJ-mediatedGT, yet the mode of their formation from single stranded T-DNA molecules is still obscure. In addition we sought to develop a system for assembly of multi-transgene binary vectors by using ZFNs. The latter may facilitate the production of binary vectors that may be ready for genome editing in transgenic plants. ZFNs were proposed for the induction of DSBs in genomic targets, namely, the FtsH2 gene whose loss of function can easily be identified in somatic tissues as white sectors, and the Cruciferin locus whose targeting by a GFP or RFP reporter vectors can give rise to fluorescent seeds. ZFNs were also proposed for the induction of DSBs in artificial targets and for assembly of multi-gene vectors. We finally sought to address two important cell types in terms of relevance to plant transformation, namely GT of germinal (egg) cells by floral dipping, and GT in somatic cells by root and leave transformation. To be successful, we made use of novel optimized expression cassettes that enable coexpression of all of the genes of interest (ZFNs and Rad genes) in the right tissues (egg or root cells) at the right time, namely when the GT vector is delivered into the cells. Methods were proposed for investigating the complementation of T-strands to dsDNA molecules in living plant cells. During the course of this research, we (i) designed, assembled and tested, in vitro, a pair of new ZFNs capable of targeting the Cruciferin gene, (ii) produced transgenic plants which expresses for ZFN monomers for targeting of the FtsH2 gene. Expression of these enzymes is controlled by constitutive or heat shock induced promoters, (iii) produced a large population of transgenic Arabidopsis lines in which mutated mGUS gene was incorporated into different genomic locations, (iv) designed a system for egg-cell-specific expression of ZFNs and RAD genes and initiate GT experiments, (v) demonstrated that we can achieve NHEJ-mediated gene replacement in plant cells (vi) developed a system for ZFN and homing endonuclease-mediated assembly of multigene plant transformation vectors and (vii) explored the mechanism of dsTDNA formation in plant cells. This work has substantially advanced our understanding of the mechanisms of DNA integration into plants and furthered the development of important new tools for GT in plants.
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Lipo, T. A., D. Panda, and D. Zarko. Design and Test of DC Voltage Link Conversion System and Brushless Doubly-Fed Induction Generator for Variable-Speed Wind Energy Applications: August 1999--May 2003. Office of Scientific and Technical Information (OSTI), November 2005. http://dx.doi.org/10.2172/861213.
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Or, Etti, David Galbraith, and Anne Fennell. Exploring mechanisms involved in grape bud dormancy: Large-scale analysis of expression reprogramming following controlled dormancy induction and dormancy release. United States Department of Agriculture, December 2002. http://dx.doi.org/10.32747/2002.7587232.bard.
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The timing of dormancy induction and release is very important to the economic production of table grape. Advances in manipulation of dormancy induction and dormancy release are dependent on the establishment of a comprehensive understanding of biological mechanisms involved in bud dormancy. To gain insight into these mechanisms we initiated the research that had two main objectives: A. Analyzing the expression profiles of large subsets of genes, following controlled dormancy induction and dormancy release, and assessing the role of known metabolic pathways, known regulatory genes and novel sequences involved in these processes B. Comparing expression profiles following the perception of various artificial as well as natural signals known to induce dormancy release, and searching for gene showing similar expression patterns, as candidates for further study of pathways having potential to play a central role in dormancy release. We first created targeted EST collections from V. vinifera and V. riparia mature buds. Clones were randomly selected from cDNA libraries prepared following controlled dormancy release and controlled dormancy induction and from respective controls. The entire collection (7920 vinifera and 1194 riparia clones) was sequenced and subjected to bioinformatics analysis, including clustering, annotations and GO classifications. PCR products from the entire collection were used for printing of cDNA microarrays. Bud tissue in general, and the dormant bud in particular, are under-represented within the grape EST database. Accordingly, 59% of the our vinifera EST collection, composed of 5516 unigenes, are not included within the current Vitis TIGR collection and about 22% of these transcripts bear no resemblance to any known plant transcript, corroborating the current need for our targeted EST collection and the bud specific cDNA array. Analysis of the V. riparia sequences yielded 814 unigenes, of which 140 are unique (keilin et al., manuscript, Appendix B). Results from computational expression profiling of the vinifera collection suggest that oxidative stress, calcium signaling, intracellular vesicle trafficking and anaerobic mode of carbohydrate metabolism play a role in the regulation and execution of grape-bud dormancy release. A comprehensive analysis confirmed the induction of transcription from several calcium–signaling related genes following HC treatment, and detected an inhibiting effect of calcium channel blocker and calcium chelator on HC-induced and chilling-induced bud break. It also detected the existence of HC-induced and calcium dependent protein phosphorylation activity. These data suggest, for the first time, that calcium signaling is involved in the mechanism of dormancy release (Pang et al., in preparation). We compared the effects of heat shock (HS) to those detected in buds following HC application and found that HS lead to earlier and higher bud break. We also demonstrated similar temporary reduction in catalase expression and temporary induction of ascorbate peroxidase, glutathione reductase, thioredoxin and glutathione S transferase expression following both treatments. These findings further support the assumption that temporary oxidative stress is part of the mechanism leading to bud break. The temporary induction of sucrose syntase, pyruvate decarboxylase and alcohol dehydrogenase indicate that temporary respiratory stress is developed and suggest that mitochondrial function may be of central importance for that mechanism. These finding, suggesting triggering of identical mechanisms by HS and HC, justified the comparison of expression profiles of HC and HS treated buds, as a tool for the identification of pathways with a central role in dormancy release (Halaly et al., in preparation). RNA samples from buds treated with HS, HC and water were hybridized with the cDNA arrays in an interconnected loop design. Differentially expressed genes from the were selected using R-language package from Bioconductor project called LIMMA and clones showing a significant change following both HS and HC treatments, compared to control, were selected for further analysis. A total of 1541 clones show significant induction, of which 37% have no hit or unknown function and the rest represent 661 genes with identified function. Similarly, out of 1452 clones showing significant reduction, only 53% of the clones have identified function and they represent 573 genes. The 661 induced genes are involved in 445 different molecular functions. About 90% of those functions were classified to 20 categories based on careful survey of the literature. Among other things, it appears that carbohydrate metabolism and mitochondrial function may be of central importance in the mechanism of dormancy release and studies in this direction are ongoing. Analysis of the reduced function is ongoing (Appendix A). A second set of hybridizations was carried out with RNA samples from buds exposed to short photoperiod, leading to induction of bud dormancy, and long photoperiod treatment, as control. Analysis indicated that 42 genes were significant difference between LD and SD and 11 of these were unique.
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HIFS-VNL, Peter Seidl, P. Seidl, J. Barnard, F. Bieniosek, J. Coleman, D. Grote, et al. Use beam steering dipoles to minimize aberrations associated with off-centered transit through the induction bunching module. Design an improved NDCX-I drift compression section to make best use of the new bunching module to optimize planned initial NDCX-I target experiments. Office of Scientific and Technical Information (OSTI), March 2008. http://dx.doi.org/10.2172/936604.
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Lers, Amnon, and Pamela J. Green. LX Senescence-Induced Ribonuclease in Tomato: Function and Regulation. United States Department of Agriculture, September 2003. http://dx.doi.org/10.32747/2003.7586455.bard.
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Natural leaf senescence, which occurs even when growth conditions are near optimal, has a negative influence on yield. Postharvest induced senescence contributes to the losses of quality in flowers, foliage, and vegetables. Strategies designed to control the senescence process in crop plants could therefore have great applied significance. However, the successful design of such strategies requires a better insight into the senescence machinery and control in higher plants. A main feature of senescence is the hydrolysis of macromolecules by hydrolases of various types such as ribonucleases (RNases) and proteases. Previously we had identified and characterized the tomato LX RNase gene demonstrating its transcript to be highly and specifically induced during senescence. This reported study was focused on LX but also had broadened our research to other senescence-associated nucleic acids degrading enzymes to learn about their function and the regulation of their encoding genes. Beside tomato we used parsley and Arabidopsis for the study of: the bi-functional nuclease which has a role in senescence. The study of different senescence- associated nucleases in few plant systems will allow a more general view on function and regulation of these enzymes in senescence. The specific original proposed objectives included: 1. Study the consequences of alterations in LX RNase level on tomato leaf senescence and general development; 2. Analyze stimuli which may participate in senescence-specific activation of the LX gene; 3. Clone the senescence-associated BFNI nuclease gene homologue from tomato. 4. Further characterize the sequences required for senescence-specific gene expression. Homozygous transgenic plants in which LX gene was either inhibited or over-expressed were generated. In both of these LX mutated plants no major phenotypic consequences were observed, which may suggests that LX is not essential for plant growth under optimal growth conditions. Lack of any abnormalities in the LX over-expressing lines suggests that special system exist to allow function of the RNase only when needed. Detailed analyses of growth under stress and consequences to RNA metabolism are underway. We have analyzed LX expression on the protein level demonstrating that it is involved also in petal senescing. Our results suggest that LX is responding to complex regulation involving developmental, organ dependent factors and responds differently to hormonal or environmental stimuli in the different plant organs. The cloned 1.4 kb promoter was cloned and its analysis revealed that probably not all required elements for senescence induction are included. Biochemical analysis of senescence-associated be-functional nucleases in the different plants, tomato, parsley and Arabidopsis, suggests they belong to a sub-class within the type I plant nucleases. The parsley PcNUC1/2 nuclease protein was purified from senescing leaves its and activity was studied in vitro revealing endo-, double strand, nucleolytic activity and exo-nucleolytic activity. Its encoding gene was cloned and found to be induced on the mRNA level. The promoter of the related Arabidopsis BFNI nuclease was shown in both tomato and Arabidopsis to be able and direct senescence-specific expression suggesting that, at least part, the gene is regulated on the transcriptional level and that the mechanism for this senescence-specific regulation is conserved between different plants. Few plants in which the BFNI gene is mutated were identified which are subjected now to detailed analysis. Our results suggest that the senescence-related nucleic acid degrading enzymes share similarities in both function and regulation between different plants and possibly have important functions in processes un-related to senescence. Still, the function of these enzymes, at least in some cases is not essential to plant development under optimal growth conditions. We are now at the stage which permits in depth investigation of the specific functions and mode of molecular regulation of senescence-associated nucleases with the aid of the research tools developed. The isolated senescence-specific promoter, shown to be active in heterologous plant system, could be utilized in agricultural-related biotechnological applications for retardation of senescence.
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Flaishman, Moshe, Herb Aldwinckle, Shulamit Manulis, and Mickael Malnoy. Efficient screening of antibacterial genes by juvenile phase free technology for developing resistance to fire blight in pear and apple trees. United States Department of Agriculture, December 2008. http://dx.doi.org/10.32747/2008.7613881.bard.
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Objectives: The original objectives of this project were to: Produce juvenile-free pear and apple plants and examine their sensitivity to E. amylovora; Design novel vectors, for antibacterial proteins and promoters expression, combined with the antisense TFL1 gene, and transformation of Spadona pear in Israel and Galaxy apple in USA. The original objectives were revised from the development of novel vectors with antibacterial proteins combined with the TFL-1 due to the inefficiency of alternative markes initially evaluated in pear, phoshomannose-isomerase and 2-deoxyglucose-6-phosphate phosphatase and the lack of development of double selection system. The objectives of project were revised to focus primarily on the development additional juvenile free systems by the use of another pear variety and manipulation of the FT gene under the control of several promoters. Based on the results creation of fire blight resistance pear variety was developed by the use of the juvenile free transgenic plant. Background: Young tree seedlings are unable to initiate reproductive organs and require a long period of shoot maturation, known as juvenile phase. In pear, juvenile period can last 5-7 years and it causes a major delay in breeding programs. We isolated the TFL1 gene from Spadona pear (PcTFL1-1) and produced transgenic ‘Spadona’ trees silencing the PcTFL1 gene using a RNAi approach. Transgenic tissue culture ‘Spadona’ pear flowered in vitro. As expected, the expression of the endogenous PcTFL1 was suppressed in the transgenic line that showed precocious flowering. Transgenic plants were successfully rooted in the greenhouse and most of the plants flowered after only 4-8 months, whereas the non-transformed control plants have flowered only after 5-6 years of development. Major achievements: Prior to flower induction, transgenic TFL1-RNAi ‘Spadona’ plants developed a few branches and leaves. Flower production in the small trees suppressed the development of the vegetative branches, thus resulting in compact flowering trees. Flowering was initiated in terminal buds, as described for the Arabidopsis tfl1 mutant. Propagation of the transgenic TFL1-RNAi ‘Spadona’ was performed by bud grafting on 'Betulifolia' rootstock and resulted in compact flowering trees. The transgenic flowering grafted plants were grown in the greenhouse under a long photoperiod for one year, and flowered continuously. Pollination of the transgenic flowers with ‘Costia‘ pear pollen generated fruits of regular shape with fertile F1 seeds. The F1 transgenic seedling grown in the greenhouse formed shoots and produced terminal flowers only five months after germination. In addition, grafted F1 transgenic buds flower and fruit continuously, generating hybrid fruits with regular shape, color and taste. Several pear varieties were pollinated with the transgenic TFL1-RNAi ‘Spadona’ pollen including `Herald Harw` that was reported to have resistance to fire blight diseases. The F-1 hybrid seedlings currently grow in our greenhouse. We conclude that the juvenile-free transgenic ‘Spadona’ pear enables the development of a fast breeding method in pear that will enable us to generate a resistance pear to fire blight. Implications: The research supported by this grant has demonstrated the use of transgenic juvenile free technology in pear. The use of the juvenile free technology for enhancement of conventional breeding in fruit tree will serve to enhance fast breeding systems in pear and another fruit trees.