1,720,970 research outputs found
Design of broadband inductorless LNAs in ultra-scaled CMOS technologies
No full textShunt-shunt resistive feedback is used in this paper to design inductorless broadband LNAs in a digital 45 nm CMOS technology. Simulation results show 18 dB gain over a 10 GHz bandwidth, with NF -7 dBm in-band, while consuming 32 mW from a 1 V supply voltage
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
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
Assessment of the impact of technology scaling on the performance of LC-VCOs
No full textThis paper analyzes the scaling of LC voltage controlled oscillator (LC-VCO) implemented in advanced planar CMOS technologies. An LC-VCO for GSM applications, has been designed in state-of-the-art 45/40 nm and 32 nm CMOS technologies, exploiting different front- and back-end of line (FEOL/BEOL) options. The designs are compared with each other and with recent literature in terms of power and phase-noise performance
Design of Ultra-Wideband Low-Noise Amplifiers in 45-nm CMOS Technology: Comparison Between Planar Bulk and SOI FinFET Devices
No full textThis paper deals with the design of single-stage differential low-noise amplifiers for ultra-wideband (UWB) applications, comparing state-of-the-art planar bulk and silicon-on-insulator (SOI) FinFET CMOS technologies featuring 45-nm gate length. To ensure a broadband input impedance matching, the g m-boosted topology has been chosen. Furthermore, the amplifiers have been designed to work over the whole UWB band (3.1-10.6 GHz), while driving a capacitive load, which is a realistic assumption for direct conversion receivers where the amplifier directly drives a mixer. The simulations (based on compact models obtained from preliminary measurements) highlight that, at the present stage of the technology development, the planar version of the circuit appears to outperform the FinFET one. The main reason is the superior cutoff frequency of planar devices in the inversion region, which allows the achievement of noise figure and voltage gain comparable to the FinFET counterpart, with a smaller power consumption
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
Low-Frequency Excess Noise Ratio Approximation for Avalanche Noise Diodes
No full textThis letter deals with microwave noise diodes in avalanche regime. Starting from the model proposed by Hines and Gliden in 1966, the asymptotic excess noise ratio (ENR) expression is derived for ω → 0. The developed theory is then validated against ENR measurements of three noise diodes already published in the literature. The agreement between theory and measurements is good and the obtained formula also predicts the 1/I0 behavior of the ENR at low frequencies. This study is relevant because it simplifies the experimental determination of the average time between two ionizations (the Hines τx model parameter) by means of low-frequency noise measurements only
UWB Fast-Hopping Frequency Generation Based on Sub-Harmonic Injection Locking
No full textSub-harmonic injection locking is employed to generate
the fast-hopping carriers required in UWB systems for
WiMedia. A very small area 90-nm CMOS prototype synthesizes
the frequencies of band group #6 with a hop time shorter than
4 ns. It occupies 0.074 mm^2 and draws 30 mA from a 1.2 V supply.
Phase noise at 8.71 GHz is -112 dBc/Hz at 1 MHz offset. The
design is supported by a thorough analysis that emphasizes the
tradeoffs in the parameters of the proposed system
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