1,720,972 research outputs found
On-chip low drop-out voltage regulator with NMOS power transistor and dynamic biasing technique
No full textWe propose a NMOS low drop-out voltage regulator suitable for on-chip power management. The circuit does not requires any external components for achieving compensation since it is internally compensated. A dynamic biasing strategy and a clock booster allows to properly drive the NMOS power transistor in a power efficient fashion and without limiting the speed response of the regulator. Transistor level simulations confirm the effectiveness of the proposed approach. © 2008 Springer Science+Business Media, LLC
Resistance of feedback amplifiers: A novel representation
No full textWe propose a representation and a related methodology for evaluating the exact input and output resistances of feedback amplifiers. Our approach is based on the generalization of the Rosenstark theorem. Indeed, it requires the computation of two resistances (direct and asymptotic) each one evaluated in one of the two ideal and extreme conditions of the return ratio (zero or infinity). Due to these characteristics, the representation allows one to understand what happens to a feedback amplifier resistance in the case of absence of feedback or in the ideal case of infinite feedback
A biasing approach to design Ultra-Low-Power Standard-Cell-Based Analog Building Blocks for Nanometer SoCs
Full text linkThis paper presents an approach to design analog building blocks for nanometer systems on a chip (SoCs) that are based on digital standard cells. The proposed approach guarantees that all the CMOS inverters, taken from a standard-cell library, operate with well-defined quiescent current and output voltage, thus allowing the implementation of analog circuits with good robustness against PVT variations. The approach is based on an Analog Body Bias Generator (ABBG) reusable block, similar to the ones adopted in digital applications to cope with process variations, and exploits the bulk terminals of both the p-channel and n-channel MOS transistors of the standard-cell inverter as current and voltage control inputs. The bulk voltages generated by the ABBG are routed to all the standard-cell inverters used for analog functions and allow to set the quiescent current of each cell to a multiple of a reference current and the static output voltage of each cell to half the supply voltage. The full custom design of the ABBG is presented, as well as the design flow to allow the automatic place and route of the proposed standard-cell based analog building blocks. We finally give an example of application to the design of a fully synthesizable four-stage-gain low-power operational transconductance amplifier (OTA). Both the body bias generator and the OTA have been implemented in a 65-nm CMOS technology. The OTA nominal current consumption is 1.75 μA with 0.41-μA standard deviation. Good robustness against supply and temperature variations is also found
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
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
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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