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Nomenclatura Unesco > (22) Física > (2203) Electrónica > (2203.02) Elementos de circuitos

Mostrando recursos 1 - 20 de 66

1. A Current-Mode Position Sensitive Circuit

   Tartagni, Marco; Perona, Pietro
   A novel technique to implement mesh-type position sensitive devices using current-mode analog VLSI is presented. By taking advantage of local analog computation this approach allows to create extremely compact circuit implementations. While in conventional approaches most sensor characteristics are adjusted by setting process parameters, our technique is fully electronically tunable and suitable to be implemented in general purpose CMOS technology. We have verified experimentally our idea designing and fabricating via MOSIS a 20 element 1D position circuit. Test results are presented demonstrating nonlinearity below 2.2% for currents in the range of 5pA to 10nA.
   

2. A 750-MHz Electronically Tunable Resonator Using Microstrip Line Couplers for Electron Paramagnetic Resonance Imaging of a Mouse Tumor-Bearing Leg

   Amida, Tatsuya; Nakaoka, Ririko; Komarov, Denis A.; Yamamoto, Kumiko; Inanami, Osamu; Matsumoto, Shingo; Hirata, Hiroshi
   Objective: The purpose of this work was to develop an electronically tunable resonator operating at 750 MHz for continuous-wave electron paramagnetic resonance (CW-EPR) imaging of a mouse tumor-bearing leg. Methods: The resonator had a multi-coil parallel-gap structure with a sample space of 16 mm in diameter and 20 mm in length. Microstrip line couplers were used in conjunction with varactor diodes to enable resonance frequency adjustment and to reduce the nonlinear effects of the varactor diodes. The resonator was modeled by the finite-element method and a microwave circuit simulation was performed to clarify its radiofrequency characteristics. Results: A tunable resonator...
   

3. Evaluation of the characteristics of electronic pulses

   Nicolaidis , M.
   A circuit for evaluating characteristics of duration and/or shape of an electric pulse induced in an element of an integrated circuit comprising an assembly of elements, each element being likely to receive an occasional external disturbance generating an electric pulse in the element, and a measurement circuit connected to the elements to determine said characteristics of an electric pulse generated in one of the elements.
   

4. Implementation of a noise-coexistence threshold logic architecture on a GaAs-based nanowire FET network

   Kuroda, Ryota; Kasai, Seiya
   Toward reconfigurable and noise-coexistence information processing system utilizing nanostructures, we study a threshold logic circuit and a double threshold function using a GaAs-based nanowire field-effect transistor (FET) network. A noise coexistence capability is based on a noise-assisted state transition in a threshold function in a threshold logic element. We fabricate a circuit reconfigurable between NAND and NOR functions. A hysteresis transfer characteristic with double threshold is realized in the GaAs nanowire by using a silicon nitride (SiN) as the gate insulator. We introduce a unique inverter design using the SiN-gate FET as a load to achieve the transfer characteristic with...
   

5. Estudio de la regulación de la tensión en la etapa de corriente continua en el tren de potencia de un vehículo eléctrico

   Muñoz Ávila, Víctor
   El vehículo eléctrico es una tecnología cuyo origen la sociedad sitúa en el siglo XXI, pero dio sus primeros pasos en el siglo XIX. Sin embargo, en el campo de la automoción, la tracción eléctrica se frenó debido a la escasa autonomía y altos tiempo de carga que presentaban las baterías, además de la robustez y bajo precio que ofrecían los coches de combustión interna a partir de combustibles fósiles. En la actualidad la alternativa del vehículo eléctrico es real. Éstos presentan rendimientos muy altos y no expulsan gases de efecto invernadero (GEI). Sin embargo, siguen teniendo, en su mayoría,...
   

6. Development of CMOS-Compatible, Microwave-Assisted Solution Processing of Nanostructured Zine Ferrite Films for Gigahertz Circuits

   Sai, Ranajit
   The development of radio frequency integrated circuits (RFICs), especially the dream of integrating analog, digital and radio frequency (RF) components on the same chip that is commonly known as System-on-a-Chip (SoC), is crucial to mobile communications of the future. Such SoC approach offers enhanced performance, greater reliability, and substantially less power consumption of integrated circuits while reducing overall physical size and thus manufacturing cost. However, the progress has been stalled by the lack of miniaturized inductor elements. Rise of unwanted parasitic effects limits down-scaling of the inductor structures and leaves the use of magnetic coating as a viable and attractive...
   

7. Coupling between partial element equivalent circuit method and an integro-differential approach for solving electromagnetics problems

   Le Duc , Tung; Chadebec , Olivier; Guichon , Jean-Michel; Meunier , Gérard
   International audience
   

8. abc-Modeling of Permanent Magnet Machines using N-D Lookup Tables: a Finite Element Validation

   Queval , Loic; Ohsaki , Hiroyuki
   

   The lumped-parameter nonlinear abc-model using N-dimensional lookup tables can naturally include geometry- and saturation-induced space harmonics. It is as accurate as the finite element model while providing a significant speedup. We validate here this model for permanent magnet synchronous machines by extensive comparison with the circuit-coupled finite element model. Three different types of machines (interior permanent magnet machine, surface mounted permanent magnet machine, flux switching permanent magnet machine) are considered, in both steady and transient state, for balanced and unbalanced operation.

   
   

9. Topological analysis of chaotic solution of a three-element memristive circuit

   Letellier , Christophe; Ginoux , Jean-Marc; Chua , Leon ,
   International audience
   

10. Desarrollo de un nuevo semiremolque extensible, para ser usado como plató móvil, construido en acero de alta resistencia

    Valladares Hernando, David; Castejon Herrer, Luis; Marquesán Casasnovas, Juan; Salas, Juan; Malón Litago, Hugo
    [ES] En el presente artículo se expone el proceso llevado a cabo para desarrollar un nuevo vehículo extensible para servicios públicos. Consiste en un semirremolque que dispone de un circuito de elementos hidráulicos que le permiten desplegar varias extensiones y un planta superior, una vez que se encuentra estático y fijado sobre unas patas de apoyo. Sin embargo, durante los trayectos que realice el semirremolque, el piso superior y todos los ventanales y extensiones del vehículo deben estar completamente replegados y recogidos, de tal forma que las dimensiones exteriores del vehículo se adecuen a las exigencias reglamentarias para su libre...
    

11. Topological analysis of chaotic solution of three-element memristive circuit

    Ginoux , Jean-Marc; Letellier , Christophe; Chua , Leon ,
    International audience
    

12. Implementación de un PLL de alta velocidad totalmente integrado en tecnología de 65nm.

    Capaldi, Valentín
    El presente es el trabajo final de la carrera de Ingeniería Eléctrica/Electrónica de la Universidad Católica de Córdoba. Éste nació como un proyecto de la capacitación de la empresa para la cual actualmente estoy trabajando, Clariphy Argentina S.A. La idea principal fué desarrollar un PLL totalmente integrado utilizando una tecnología CMOS de 65nm, con 5GHz de salida en base a una frecuencia de referencia de 156.25MHz. La aplicación de este circuito será como generador de clock con bajo jitter de salida para otros circuitos. En primera instancia el circuito fue estudiado detenidamente, con una extensa investigación sobre lo que actualmente existe desarrollado. Luego se...
    

13. Empleo de técnicas de sistemas tolerantes a fallas en el diseño de microprocesadores.

    Toledo, Luis Eduardo dir.
    Un circuito es tolerante a fallas si puede continuar realizando sus funciones en presencia de errores de hardware o software [1], es decir, la calidad del servicio que presta dicho circuito no disminuye cuando el sistema se ve afectado por alguna falla. Los circuitos VLSI (Very Large Scale Integration) son susceptibles de sufrir fallas debidas a causas naturales, principalmente a la radiación cósmica. Estas fallas se denominan Efectos de Eventos Simples, en inglés Single Event Effects (SEEs). Tradicionalmente, los SEEs han supuesto una preocupación para los diseñadores de aplicaciones que trabajan en entornos hostiles, como las aplicaciones aeroespaciales o militares...
    

14. Diseño de monitores de polarización en guías fotónicas integradas

    CANO OLMEDA, JUAN MANUEL
    Multitud de funcionalidades de proceso de información en el régimen óptico son realizados en circuitos ópticos integrados fabricados usando tecnologías como la fotónica en silicio o las heteroestructuras de semiconductores III-V. El elemento fundamental de dichos circuitos es la guía de onda integrada, que nos permite interconectar diferentes elementos de proceso en un mismo chip. Para mejorar las capacidades de proceso información de dichos chip, es conveniente usar los distintos modos (o polarizaciones) de las guías que se insertan en él. Por ejemplo, en un chip de silicio es usual usar los dos modos de propagación fundamentales: TE y TM....
    

15. Phase transition-like behavior in a low-pass filter

    Krivine , Hubert; Lesne , Annick
    We discuss an iterative electric circuit for which the limits of infinite number of elements and zero dissipation in each element do not commute. The circuit is taken from the Feynman lectures, where it was argued on physical considerations that an infinite circuit made only of inductances and capacitances would behave as a dissipative system with nonvanishing resistance below a threshold frequency. The understanding of this behavior requires that the two limits be taken in the appropriate order. This simple example illustrates that caution in multiple limiting procedures is necessary to obtain the correct physical behavior. A close analogy with...
    

16. A hardware efficient 3-bit second-order dynamic element matching circuit clocked at 300MHz

    Najafi Aghdam , Esmaeil; Benabes , Philippe
    International audience
    

17. Wide Frequency Range Lumped Element Equivalent Circuit for HF Planar Transformer

    Besri , Abdelhadi; Margueron , Xavier; Keradec , Jean-Pierre; Delinchant , Benoît
    International audience
    

18. Theoretical study of a self-sustained CMOS-integrated nano-oscillator

    Arndt , Grégory; Colinet , Eric; Arcamone , Julien; Juillard , Jérôme
    Over the last ten years, the progress of Nanoelectromechanical systems (NEMS) fabrication has opened new possibilities for the use of NEMS as high-performance, low-cost, compact sensors [1]. In NEMS resonators-based sensors, the resonant frequency depends upon the physical parameter to be measured [2]. To track dynamically the time-varying resonant frequency of the NEMS, one approach consists in embedding the NEMS in a self-oscillating loop so that it oscillates at its resonant frequency. The resonator chosen in this study uses electrostatic actuation and capacitive detection. This has the advantage of having a relatively simple implementation and good transduction efficiency. Furthermore, this...
    

19. Perturbation Finite Element Method for Refining Magnetic Circuit Models

    Dular , Patrick; Sabariego , Ruth ,; Ferreira Da Luz , Mauricio ,; Kuo-Peng , Patrick; Krähenbühl , Laurent