Noise Figure
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Co-Design of a GPS Antenna Low-Noise Amplifier Front-End Circuit
Abstract This paper presents a clear and fast design procedure for directly matched low noise active integrated microstrip antenna front end circuits. Initially, a theoretical analysis is given for the overall gain equivalence between traditional and directly matched antennas. Then, a detailed procedure is presented for the design and construction of a fully
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 11/11/2019
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2. Auditory Alterations in Children Infected by Human Immunodeficiency Virus Verified Through Auditory Processing Test
Abstract Introduction The auditory system of HIV-positive children may have deficits at various levels, such as the high incidence of problems in the middle ear that can cause hearing loss. Objective The objective of this study is to characterize the development of children infected by the Human Immunodeficiency Virus (HIV) in the Simplified Auditory Pro
Int. Arch. Otorhinolaryngol.. Publicado em: 2017-03
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3. A flat-gain LNA based on LTCC technology at UHF (300-500 MHz)
Abstract This paper presents a design and simulation of a low noise amplifiers (LNA) with all passives elements embedded on low temperature co-fired ceramic (LTCC) substrate. Simulation results in ANSYS Designer and CST Studio Suite reveal that the proposed LNA has a flat-gain of 23.34 dB from 300 to 500 MHz, a noise figure below 0.73 dB and a compact size o
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-09
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4. Effects of auditory training in individuals with high-frequency hearing loss
OBJECTIVE: To determine the effects of a formal auditory training program on the behavioral, electrophysiological and subjective aspects of auditory function in individuals with bilateral high-frequency hearing loss.
Clinics. Publicado em: 2014
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5. Hybrid distributed Raman/EDFA amplifier with hybrid automatic gain control for reconfigurable WDM optical networks
Nowadays, optical amplifiers designs are induced by new requirements generated by optical networks. The introduction of WDM reconfigurable networks with increasing rate from 10-40 Gb/s to 100 Gb/s and beyond, demand new optical amplifiers development with improved gain spectral flatness and noise figure for all operational range of input powers and set-point
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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6. (Central) Auditory Processing: the impact of otitis media
OBJECTIVE: To analyze auditory processing test results in children suffering from otitis media in their first five years of age, considering their age. Furthermore, to classify central auditory processing test findings regarding the hearing skills evaluated. METHODS: A total of 109 students between 8 and 12 years old were divided into three groups. The cont
Clinics. Publicado em: 2013-07
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7. A passive-matched 22 GHz 2.6-dB-NF CMOS front-end with a 70-800 ps delay block
This paper presents a power-efficient RF differential receiver front-end supporting transmitted-reference (TR) communication in a 90 nm CMOS technology. Particularly, it addresses the issues of designing the frontend amplifier with low-noise and passive matching circuits on a silicon process and integrating a low-power delay unit in the front-end with wideba
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-06
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8. Gain profile optimization for Raman+EDFA hybrid amplifiers with recycled pumps for WDM systems
An approximated technique to quickly optimize the gain profile of multi-pump broadband hybrid amplifiers under residual pump recycling in WDM systems is proposed. It is based on the amplifier spectral equalization by adjusting the flexible gain profile of a multi-pump Raman amplification stage to compensate the Erbium-doped stage gain variation within the C-
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2010-12
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9. Avaliação dos comportamentos auditivos de figura-fundo e de resolução temporal e da percepção de limitações de atividades comunicativas em crianças e adolescentes portadores de deficiência auditiva unilateral. / Evaluation of auditory behaviors of figure-to-ground and temporal resolution and the perception of limitations on communicative activities of children and adolescents with unilateral hearing loss.
OBJETIVO: Avaliar os comportamentos auditivos de figura-fundo e resolução temporal e a auto-percepção das limitações de atividades comunicativas de crianças e adolescentes portadores de deficiência auditiva unilateral. MÉTODOS: Participaram do estudo 38 indivíduos, com idades entre 8 e 19 anos (media 12,32) , divididos em: grupo estudo (portadores
Publicado em: 2010
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10. Utilização do sinal analitico liquido para avaliação de modelos de calibração multivariada atraves do calculo de figuras de merito e de cartas de controle / Utilization of net analyte signal for validation of models of multivariate calibration by using figure of merit and chart control
This study was mainly intended to elaborate the validation of multivariate calibration models based on the determination of figures of merit and multivariate control charts constructed with data from Nimesulide tablets upon near-infrared spectroscopy use. A total of 69 synthetic samples were prepared containing the active principle (Nimesulide) in the range
Publicado em: 2007
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11. ContribuiÃÃes ao algoritmo de roteamento para redes Ãpticas baseado na figura de ruÃdo e nas penalidades fÃsicas / Contributions to the routing algorithm for optical networks based on noise figure and physical impairments
This dissertation demonstrates a novel dynamic routing algorithm for transparent optical networks based on physical layer impairments such as, amplifier noise accumulation, amplifier gain saturation and device losses along lightpaths. The metric of the algorithm is based on the calculation of the noise figure using the well known formulation for a cascade of
Publicado em: 2006
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12. Mistura e geração experimental de sinais de microonda empregando amplificadores opticos semicondutores
Recently, the development of techniques that allow optical transmission and generation of microwave and millimetre-wave signals have received significant attention, mainly due to the fact that considerably low-noise optical wavelenght-division multiplexed systems are available to transmit large amounts of data throughout many points interconnected by optical
Publicado em: 1998