1,720,981 research outputs found
Novel Techniques To Improve The Gtem Chamber Performance By Applying Metamaterial Concepts On The Excitation Sector: The Apex Characterization
No full textIn this work it is presented the analysis and characterization of different types of metamaterial patterns, such as fractal cells, Jerusalem-Cross-Pair, SRR Split Ring Resonator and CSRR Complementary Split Ring Resonator printed on the septum of a GTEM chamber. The main goal is to improve the chamber overall performance and to optimize it in terms of frequency for the electromagnetic compatibility analysis of integrated circuits and electronic boards. Experimental results are compared to simulated ones showing the advantages of the tuned characteristic of the patterned septum in comparison to the conventional type. This technique appears as an option for the performance optimizations of compact GTEM chambers. © 2011 IEEE.Dhia, Ramdani, S.B.M., Sicard, E., Electromagnetic compatibility of integrated circuits (2006) Techniques for Low Emission and Susceptibility, , SpringerMontrose, M.I., Nakauchi, E.M., (2004) Testing for EMC Compliance, , Wiley Interscience, New YorkAraujo, H.X., Kretly, L.C., An em simulation and design a GTEM chamber for EMC pre-compliance tests on electronic board and ICs in 500 MHz - 18 GHz Range (2010) Momag 2010, , Vila Velha, Brazil, AugustIcheln, C., (1995) The Construction and Application of A GTEM Cell, , Master's Thesis, Hamburg - GermanyKonigstein, D., Hansen, D., A new family of TEM-cells with enlarged bandwidth and optimized working volume (1987) Proceedings of the 7 th International Zurich Symposium on Electromagnetic Compatibility, pp. 127-130. , Zurich, MarchBose, J.C., On the rotation of plane of polarization of electric waves by a twisted structure (1898) Proc. Roy. Soc., 63, pp. 146-152Lindell, I.V., Sihvola, A.H., Kurkijarvi, J., Karl F. Lindman: The last Hertzian, and a Harbinger of electromagnetic chirality (1992) IEEE Antennas Propag. Mag., 34 (3), pp. 24-30Cui, T.J., Electromagnetic Metamaterials: Recent advances on the theory, experiments, and applications (2008) IEEE Antennas Propag. Mag.Martynyuk, A.E., Lopez, J.I.M., Martynyuk, N.A., Spiraphase-type reflectarrays based on loaded ring slot resonators (2004) IEEE Transactions on Antennas and Propag., 52, pp. 142-153Cui, T.J., Smith, D.V., Liu, R., (2010) Metamaterials:Theory, Design and Applications, , Springer, New YorkCapolino, F., (2009) Metamaterials Handbook: Applications of Metamaterials, , CRC PressCapolino, F., (2009) Metamaterials Handbook: Theory and Phenomena of Metamaterials, , CRC PressErentok, A., Luljak, P., Ziolkowski, R.W., Antenna performance near a volumetric metamaterial realization of an artificial magnetic conductor (2005) IEEE Trans. Antennas Propagat., 53, pp. 160-172Araujo, H.X., Kretly, L.C., The effect of metamaterial patterning to improve the septum GTEM chamber performance (2011) 29 th Progress in Electromagnetics Research Symposium, , Marrakesh, Marc
Improving Q-factor Of Monolithic Inductor By Using Double Ground Shield - N+ Buried And Polysilicon - A Realistic Simulation
No full textThis work presents a new alternative to improve integrated inductor performance, incorporating double ground shield using polysilicon and n+ buried layer, providing a fully shield and preventing the electric field penetration. This technique was compared with conventional inductors and improves Q-factor up to 50% at 3.5, 4 and 5 GHz. The results were obtained based on AMS 0.35μm BiCMOS technology. This method can be applied to any BiCMOS technology. ©2008 IEEE.14Capovilla, C.E., Tavora, A.S.A., Kretly, L.C., A fully integrated 2.5GHz band CMOS Low Noise Amplifier with multiple switched inputs for diversity wireless communications (2007) IEEE MTT-S Microwave and Optoelectronic Conference, pp. 625-629. , OctM. Usami, M. Ohki, The p-chip: an ultra small 2.45GHz, RFID chip for ubiquitous recognition applications, IEICE Trans. Electron., e86-c,no.4, pp. 521-528, Apr 2003C. P.Yue, C.Ryu, J.Lau, T. H.Lee, and S. S.Wong, A physical model for planar spiral inductors on silicon, Proc. IEEE Int. Electron Devices Meeting, San Francisco, CA, 1996Craninckx, J., Steyaert, M., A 1.8-GHz Low-Phase- Noise CMOS VCO Using Optimized Hollow Spiral Inductors (1997) IEEE Journal of Solid-State Circuits, 32 (5), pp. 736-744. , MayYue, C.P., Wong, S.S., On-Chip Spiral Inductors with Patterned Ground Shields for Si-Based RF IC's (1997) Symposium on VLSI Circuits, pp. 85-86Sun, Y., van Zejl, Y.H.W., Tauritz, J.L., Baets, R.G.F., Suspended membrane inductors and capacitors for application in siliscom MMIC's (1996) IEEE Microwave and Millimetre-Wave Monolithic Circuits Symposium Digest, pp. 99-102. , JunYim, S.-M., Chen, T., O, K.K., The effects of a ground shield on spiral inductors fabricated in a silicon bipolar technology (2000) Proc. Bipolar/BiCMOS Circuits and Technology Meeting (BCTM), pp. 157-160. , SeptE. Ragonese, A. Scuderi, T. and G. Palmisano, Experimental comparison of substrate structures for inductors and transformers, in 12th IEEE Mediterranean Electrotechnical Conference (MELECON 2004), Dubrovnik, Croatia, pp. 143-146, May 2004Ragonese, E., Girlando, G., Palmisano, G., A very accurate design of monolithic inductors in a 2D EM simulator (2002) Proc. IEEE Int. Conf. on Electronics, Circuits and Systems (ICECS 2002), pp. 1199-1202. , Dubrovnik, Croatia, pp, SeptAustriamicrosystems, 0.35μm HBT BiCMOS Process Parameters, , Application Note ENG-219 Rev. 3.0http://www.sonnetusa.com, Sonnet Software Inc. AvailableBurghartz, J.N., Ruehli, A.E., Jenkins, K.A., Soyuer, M., Nguyen-Ngoc, D., Novel substrate contact structure for high-Q silicon-integrated spiral inductors (1997) Tech. Dig. Int. Electron Devices Meeting (IEDM), pp. 55-58Mernyei, F., Darrer, F., Pardoen, M., Sibrai, A., Reducing the Substrate Losses of RF Integrated Inductors (1998) IEEE Microwave and Guided Wave Letts, 8 (9), pp. 300-30
High Q-factor Monolithic Inductor For Rf Devices Using Double Ground Shield
No full textThis paper presents a technique to improve RF integrated inductor performance, incorporating double ground shield using polysilicon and n+ buried layer, providing a fully shield and preventing the electric field penetration. This method was compared with conventional inductors, patterned ground shield, double ground shielding using polysilicon inductors, and improves Q-factor up to 50% at 3.5, 4 and 5 GHz. The results were obtained based on AMS 0.35μm BiCMOS technology. This technique can be applied to any BiCMOS technology without any additional process. ©2008 IEEE.Capovilla, C.E., Tavora, A.S.A., Kretly, L.C., A fully integrated 2.5GHz band CMOS Low Noise Amplifier with multiple switched inputs for diversity wireless communications (2007) IEEE MTT-S Microwave and Optoelectronic Conference, pp. 625-629. , OctM. Usami, M. Ohki, The p-chip: an ultra small 2.45GHz, RFID chip for ubiquitous recognition applications, IEICE Trans. Electron., e86-c,no.4, pp. 521-528, Apr 2003C. P.Yue, C.Ryu, J.Lau, T. H.Lee, and S. S.Wong, A physical model for planar spiral inductors on silicon, Proc. IEEE Int. Electron Devices Meeting, San Francisco, CA, 1996Craninckx, J., Steyaert, M., A 1.8-GHz Low-Phase- Noise CMOS VCO Using Optimized Hollow Spiral Inductors (1997) IEEE Journal of Solid-State Circuits, 32 (5), pp. 736-744. , MayYue, C.P., Wong, S.S., On-Chip Spiral Inductors with Patterned Ground Shields for Si-Based RF IC's (1997) Symposium on VLSI Circuits, pp. 85-86Sun, Y., van Zejl, Y.H.W., Tauritz, J.L., Baets, R.G.F., Suspended membrane inductors and capacitors for application in silicon MMIC's (1996) IEEE Microwave and Millimetre-Wave Monolithic Circuits Symposium Digest, pp. 99-102. , JunYim, S.-M., Chen, T., O, K.K., The effects of a ground shield on spiral inductors fabricated in a silicon bipolar technology (2000) Proc. Bipolar/BiCMOS Circuits and Technology Meeting (BCTM), pp. 157-160. , SeptE. Ragonese, A. Scuderi, T. and G. Palmisano, Experimental comparison of substrate structures for inductors and transformers, in 12th IEEE Mediterranean Electrotechnical Conference (MELECON 2004), Dubrovnik, Croatia, pp. 143-146, May 2004Ragonese, E., Girlando, G., Palmisano, G., A very accurate design of monolithic inductors in a 2D EM simulator (2002) Proc. IEEE Int. Conf. on Electronics, Circuits and Systems (ICECS 2002), pp. 1199-1202. , Dubrovnik, Croatia, pp, SeptTan, H.P., Ma, J.G., Yeo, K.S., Do, M.A., High-Q Si-Based Inductor Shielded With Double-Layer Polysilicon for RF Applications (2000) Microwave and Optical Technology Letters, 24 (6). , MarchAustriamicrosystems, 0.35 m HBT BiCMOS Process Parameters, , Application Note ENG-219 Rev. 3.0http://www.sonnetusa.com, Sonnet Software Inc. AvailableBurghartz, J.N., Ruehli, A.E., Jenkins, K.A., Soyuer, M., Nguyen-Ngoc, D., Novel substrate contact structure for high-Q silicon-integrated spiral inductors (1997) Tech. Dig. Int. Electron Devices Meeting (IEDM), pp. 55-58Mernyei, F., Darrer, F., Pardoen, M., Sibrai, A., Reducing the Substrate Losses of RF Integrated Inductors (1998) IEEE Microwave and Guided Wave Letts, 8 (9), pp. 300-30
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
Minimizing The Mismatch Errors At The Vco And Cascode Buffer Connections In Front End Of Bicmos Rfics Operating On S Band
No full textThis work presents a VCO in the -Gm LC configuration, that operates in the range of 1.3 up to 1.8GHz, followed by amplifiers in the cascode configuration connected to the output. This concept is used with the intention to increase the isolation and inhibits the effects provoked by the impedance mismatches, which depend on the inner and outer agents to the chip. The solution in question inhibits the effects provoked by one of the inner causes of the impedances mismatch, which is the connection with other circuits that are part of a determined system. For the front-ends, the connections with the mixers must be observed with attention, because the VSWR (Voltage Standing Wave Ratio) values, presented by these circuits are high and are between 2.5 and 4.8 in this frequency band. The impedances mismatch effects, caused by wires in the encapsulations assemblies, and in the chip on board, arranged with the output loads are also much minimized to the oscillators, with the amplifiers use in the cascode configuration. The RFIC (Radio Frequency Integrated Circuit) was implemented on SiGe BiCMOS .35m technology from AMS (Austria Microsystems) foundry. Copyright 2007 ACM.267270Kretly, L.C., Marins, C.N.M., VCO using the -Gm LC configuration and Cascode Buffer for 1.3 to 1.8 GHz with CMOS Technology (2006) International Technical Symposium on Packaging, Assembling and Testing & Exhibition, , IMAPS BrazilHassun, R., Frequency Converters: Understanding the Benefits of Simple and Complex ArchitecturesMicrowave Journal 49-No. 10, pp. 166-174, October 2006-Horizon HouseGilmore, R., Besser, L., Practical RF Circuit Design for Modern Wireless Systems (2003), 2. , Active Circuits and SystemsArtech House, IncRogers, J., Plett, C., (2003) Radio Frequency Integrated Circuit Design, , Artech House, IncHajimiri, A., Lee, T.H., Phase Noise in CMOS Differential LC Oscillators (1998) Symposium on VLSI Circuits, p. 167Hajimiri, A., Lee, T.H., A General Theory of Phase Noise in Electrical Oscillators (1998) IEEE Journal of Solid State Circuits, 33 (2), pp. 179-194. , FebBunch, R., Raman, S., A 0,35□m CMOS 2,5GHz Complementary - Gm VCO using PMOS Inversion Mode Varactors (2001) IEEE Radio Frequency Integrated Circuits Symposium, pp. 49-52Collin, R.E., Foundations for Microwave Engineering (1992) The IEEE Press Series on Electromagnetic Wave Theory, , 2 nd EdSowlali, T., Leenaerts, D.M.W., A 2,4GHz 0,18□m CMOS Self-Biased Cascode Power Amplifier (2003) IEEE Journal of Solid-State Circuits, 38 (8), pp. 1318-1324. , AugustBunch, R.L., Raman, S., Large Signal Analysis of MOS varactors in CMOS -Gm LC VCOS (2003) IEEE Journal of Solid-State Circuits, 38 (8), pp. 1325-1332. , AugustCripps, S.C., (2002) Advanced Techniques in RF Power Amplifier Design, , Ed. Artech House, IncBunch, R.L., Raman, S., A 0.35□m CMOS 2,5GHz Complementary -Gm VCO Using PMOS Inversion Mode Varactors (2001) IEEE Radio Frequency Integrated Circuits Symposiu
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