Search results for "Amplitude modulation"

showing 3 items of 63 documents

Extended Depth-of-Field 3-D Display and Visualization by Combination of Amplitude-Modulated Microlenses and Deconvolution Tools

2005

One of the main challenges in 3-D display and visualization is to overcome its limited depth of field. Such limitation is due to the fast deterioration of lateral resolution for out-of-focus object positions. Here we propose a new method to significantly extend the depth of field. The method is based on the combined benefits of a proper amplitude modulation of the microlenses, and the application of deconvolution tools. Numerical tests are presented to verify the theoretical analysis.

business.industryComputer scienceIterative reconstructionCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsVisualizationAmplitude modulationOpticsAmplitudeModulation (music)Depth of fieldDeconvolutionElectrical and Electronic EngineeringbusinessImage resolutionJournal of Display Technology
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Single Event Transients and Pulse Quenching Effects in Bandgap Reference Topologies for Space Applications

2016

An architectural performance comparison of bandgap voltage reference variants, designed in a $0.18~\mu \text {m}$ CMOS process, is performed with respect to single event transients. These are commonly induced in microelectronics in the space radiation environment. Heavy ion tests (Silicon, Krypton, Xenon) are used to explore the analog single-event transients and have revealed pulse quenching mechanisms in analogue circuits. The different topologies are compared, in terms of cross-section, pulse duration and pulse amplitude. The measured results, and the explanations behind the findings, reveal important guidelines for designing analog integrated circuits, which are intended for space appli…

mikroelektroniikkaNuclear and High Energy PhysicsBandgap voltage referencecircuit topologysingle-event transient (SET)Integrated circuit01 natural scienceslaw.inventionsingle event transientsCurrent mirrorlawpulse quenchingsingle-event effects (SEE)ionizationradiation hardening by design (RHBD)0103 physical sciencesElectronic engineeringMicroelectronicsAnalog single-event transient (ASET); bandgap voltage reference (BGR); charge sharing; CMOS analog integrated circuits; heavy ion; ionization; parasitic bipolar effect; pulse quenching; radiation effects; radiation hardening by design (RHBD); reference circuits; single-event effects (SEE); single-event transient (SET); space electronics; Voltage reference; Nuclear and High Energy Physics; Nuclear Energy and Engineering; Electrical and Electronic EngineeringAnalog single-event transient (ASET)Electrical and Electronic Engineeringparasitic bipolar effectreference voltage010302 applied physicsPhysicsbandgap voltage reference (BGR)charge sharingta114ta213010308 nuclear & particles physicsbusiness.industryanalog integrated circuitsTransistorspace electronicsPulse durationheavy ionPulse (physics)Voltage referenceNuclear Energy and EngineeringPulse-amplitude modulationreference circuitsmicroelectronicsradiation effectsspace applicationsOptoelectronicsbusinessCMOS analog integrated circuitsIEEE Transactions on Nuclear Science
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On the evaluation of an optical OFDM radio over FSO system with IM-DD for high-speed indoor communications

2017

En aquest article es proposa un nou sistema híbrid de ràdio sobre fibra (RoF) i òptica d’espai lliure (FSO) basat en la transmissió de senyals òptics OFDM (OOFDM) per proporcionar enllaços de comunicació sense fils òptics d’alta capacitat. Es proposa un esquema de transmissió de baix cost basat en IM-DD per simplificar i reutilitzar la infraestructura existent per desplegar un enllaç FSO d’alt ample de banda. Aquest article mostra els resultats experimentals basats en la implementació de l'esquema proposat sota una transmissió digital OOFDM de 16 QAM a través de 10 km de fibra monomode (SMF) i enllaç FSO de 300 mm. Els resultats mostren la viabilitat de desplegar un sistema de comunicació d…

quadrature amplitude modulationoptical wireless communications:CIENCIAS TECNOLÓGICAS [UNESCO]OFDM modulationradio-over-fibrefree-space optical communicationUNESCO::CIENCIAS TECNOLÓGICASindoor communication
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