1,720,973 research outputs found
Oscillator and method for generating an oscillator signal
No full textAn oscillator includes a first resonator circuit, a second resonator circuit coupled to the first resonator circuit and a reconfigurable network having a transconductance and coupled to at least one of the resonator circuits. Reconfiguration of the reconfigurable network with respect to the transconductance allows selection of one of multiple oscillation modes of the oscillator
Transformer-based dual-mode voltage-controlled oscillators
No full textIn this brief, we propose to use a transformer-based
resonator to build a dual-mode oscillator, e.g., a system capable
of oscillating at two different frequencies without recurring to
switched inductors, switched capacitors, or varactors. The behavior
of the resonator configured as a one-port and a two-port
network is studied analytically, and the dependence of the quality
factor on the design parameters is thoroughly explored. These
results, combined with the use of traditional frequency tuning techniques,
are applied to the design of a wide-band voltage-controlled
oscillator (VCO) that covers the frequency range 3.6–7.8 GHz.
The performance of the designed VCO, implemented in a digital
0.13-um CMOS technology, has been studied by transistor-level
and 2.5D electromagnetic simulation (Agilent Momentum). A
typical phase noise performance at 1-MHz offset of -104 dBc Hz
has been predicted, while the power consumption ranges from
1 to 8 mW, depending on the VCO configuration
A fully integrated differential CMOS LNA for 3-5-GHz ultrawideband wireless receivers
No full textA fully integrated differential low-power low-noise
amplifier (LNA) for ultrawideband (UWB) systems operating in
the 3–5-GHz frequency range is presented. A two-section
ladder input network is exploited to achieve excellent input match
in a wideband fashion and to optimize the noise performance.
Prototypes fabricated in a digital 0.13-um complementary metal
oxide semiconductor technology show the following performance:
9.5-dB peak power gain, 3.5-dB minimum noise figure, -6-dBm
input-referred 1-dB compression point, and -0.8-dBm input-referred
third-order intercept point, while drawing 11 mA from
a 1.5-V supply. The realized LNA is compared with previously
reported LNAs tailored for the same frequency range
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Quadrature VCOs Based on Coupled PLLs
No full textThis work proposed to use a two-element array of coupled PLLs to generate quadrature signals. The main advantage of this technique is that phase noise performance and quadrature accuracy do not trade-off. A dual-mode quadrature VCO designed in a digital 0.13 um CMOS technology is used as test vehicle to verify the viability of the proposed concept
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
A 6-9-GHz Programmable Gain LNA with Integrated Balun in 90-nm CMOS
No full textA low-noise amplifier (LNA) for operation over the common frequency range (6-9-GHz) allocated for Ultrawideband (UWB) communications both in USA, Europe, and Japan is presented. Implemented in a pure digital 90 nm CMOS technology, it features a 12.5 dB voltage gain over a 4.5-11-GHz 3-dB bandwidth, S11 -6.8 dBm at a power consumption as low as 20.4 mW. The prototype includes an integrated balun for single ended to differential conversion and features a 4-step 12.7 dB programmable gain variation
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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