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Efficiency optimization of integrated DC-DC buck converters

Gregory Sizikov, Avinoam Kolodny, Eby G. Fridman, Michael Zelikson
2010 2010 17th IEEE International Conference on Electronics, Circuits and Systems  
An analytic method to evaluate frequency dependent losses in on-chip DC-DC buck converters is presented in this paper. Microprocessors or chipsets exhibit wide dynamic range of load current varying from 50mA up to 1.5 A per phase at full operation. Peak efficiency is shown to occur when the load current related losses and the inherent losses of the DC-DC converter are equal. Efficiency optimization methods are described for light and heavy load scenarios. The primary design objective is to
more » ... ain the load at the peak of the efficiency curve. A SPICE based circuit model of a DC-DC converter is applied to validate the proposed analytic methods.
doi:10.1109/icecs.2010.5724735 dblp:conf/icecsys/SizikovKFZ10 fatcat:7rxzikljubeizmcmhouqthv5qe

Frequency dependent efficiency model of on-chip DC-DC buck converters

Gregory Sizikov, Avinoam Kolodny, Eby G. Fridman, Michael Zelikson
2010 2010 IEEE 26-th Convention of Electrical and Electronics Engineers in Israel  
An analytic method to evaluate frequency dependent losses in on-chip DC-DC buck converters is presented in this paper. These converters feature high switching losses caused by the skin effect in the package inductors. The frequency dependent air-core inductor model is shown to be critical in determining the optimal switching frequency. A general RLC parameter extraction method is also described. Considering the skin effect results in a 15% reduction in overall DC-DC converter losses. The
more » ... d approach focuses on decreasing ripple current related losses, which are dominant in the target operating condition. Consequently, to obtain optimal efficiency, the switching frequency increases as the load current decreases. An intuitive explanation for this surprising result is that switching losses rise linearly with frequency whereas ripple losses decrease as n 1. . A SPICE based circuit model of a DC-DC converter is applied to validate the proposed analytic method. (Abstract) Keywords-on chip DC-DC; frequency dependent losses buck converter efficiency; air core inductor (keywords)
doi:10.1109/eeei.2010.5662132 fatcat:dke4gu4orff4jdyzila2whqjk4

Page 49 of National Union Catalog Vol. 16, Issue [page]

1942 National Union Catalog  
Editionem curavit Michael Bo- brzytiski. In supplemento: Statuta synodalia Andreae epi Posnaniensis elidit dr. Udalricus Heyzmann.  ...  Institut Marksa- Engel'sa-Lenina. 38-12250 Library of Congress DK2.LABSS 2 * Bobrovskafa, TSetsilifé Samofl (Zelikson) 1876- .  ... 

Page 408 of National Union Catalog Vol. 167, Issue [page]

1942 National Union Catalog  
Library LB1027.C7_ no. 68 for Library of Congress (LB7.C75_ no. 63) ®, Zelikson, Michael, comp. The artist of the Kamerni theater, 1914-xx-1934. Foreword by Abraham Efros.  ...  Michael Ze! w. Gosudarstvenny! eee teatr. 2. Theater—Moscow. 3. ters——Stage-setting and scenery. tume. 5. Talrov, Aleksandr fAkovlevich, 1885- 1. Mosco’ 1.  ... 

Page 3785 of Mathematical Reviews Vol. , Issue 2002E [page]

2002 Mathematical Reviews  
I Zelikson, Shmuel Zelinka, Bohdan Zeller, Karl Zeller, Sibylle ....... Zelmanov, E. Zeltser, Maria Zenchuk, A. | Zeng, Yonghong . Zerner, Martin P. W. Zeuner, Hansmartin .  ...  68026 Zakharyaschev, Michael . See Z Zakiev, M. I Zakoian, Jean-Michel Zakovic, Stanislav Zaks, Arnold Zaks, Shmuel Zalesny, V. B. Zalesnyi, V. B Zalesskii, A. E Zalgaller, V. A. Zalkikar, Jyoti N.  ... 

Page 421 of Mathematical Reviews Vol. , Issue Subject Index [page]

Mathematical Reviews  
(English summary) 2002b:16039 Vanhaecke, Pol see Penkava, Michael, 2002m:16006  ...  G., 2002¢:17012 Penkava, Michael (with Vanhaecke, Pol) Hochschild cohomology of polynomial algebras. (English summary) 2002m:16006 Price, Kenneth L.  ... 

Siberia at the Last Glacial Maximum: Environment and Archaeology

Yaroslav V. Kuzmin
2008 Journal of Archaeological Research  
The digest by Michael (1984) is more updated, including information available before the early 1980s.  ...  Archaeological data from layer 6 have been widely published (e.g., Abramova 1965; Michael 1984, pp. 37-38 ; see summary in Medvedev 1998, pp. 129-131) ( Table 5 ).  ... 
doi:10.1007/s10814-007-9019-6 fatcat:ke2w5vkjjrcofn3kzj7e3nkuru

Siberia at the Last Glacial Maximum: Environment and Archaeology

Yaroslav V. Kuzmin
2008 Journal of Archaeological Research  
The digest by Michael (1984) is more updated, including information available before the early 1980s.  ...  Archaeological data from layer 6 have been widely published (e.g., Abramova 1965; Michael 1984, pp. 37-38 ; see summary in Medvedev 1998, pp. 129-131) ( Table 5 ).  ... 
doi:10.1007/s10814-008-9022-6 fatcat:bio37tp2ondm7joh7tshhdjxmy

Page 7888 of Journal of Biological Chemistry. [Filmed From the Online Edition] Vol. 246, Issue Index [page]

Journal of Biological Chemistry. [Filmed From the Online Edition]  
SCHNEIDER, MICHAEL EMMER, Ropert L. PERLMAN, AND IRA PaAsTan.  ...  Purification of Reduced Pyridine Nu- cleotide Dehydrogenase from Human Erythrocytes and Methemoglobin Reduction by the Enzyme ZELIKSON, RuTH, GAVRIELA EILAM-RUBIN, KuLkKa. peptidases of Chick Pancreas  ... 

Page 7888 of Journal of Biological Chemistry. [Filmed From the Online Edition] Vol. 246, Issue Index [page]

Journal of Biological Chemistry. [Filmed From the Online Edition]  
SCHNEIDER, MICHAEL EMMER, Rospert L. PERLMAN, AND IRA Pastan.  ...  Purification of Reduced Pyridine Nu- cleotide Dehydrogenase from Human Erythrocytes and Methemoglobin Reduction by the Enzyme ZELIKSON, RutTH, GAVRIELA EILAM-RUBIN, AND R. G. Kutka.  ... 

Page 4664 of Bibliography of Agriculture. Annual Cumulative Indexes Vol. 47, Issue [page]

Bibliography of Agriculture. Annual Cumulative Indexes  
088047 Zem, A.C. 013213, 013218, 101376 Zeman, A.M.M. 013926 Zeman, L. 033842, 067377 Zeman, M. 107312 Zemanek, J. 051098, 102568 Zemek, J. 030810, 098569, 09857 8571 Zemel, M.B. 046305, 055987 Zemel, Michael  ...  , E.M. 075506 Zelikson, R. 048443 Zelinka, L. 065427 Zelinka, M. 037688 Zelinskaia, L.M. 013040 Zelinski, M.B. 105508 Zelinskii, A. 000430 Zelinskii, A.A. 094997 Zelitch, I. 012091, 099650 Zelleke, A.  ... 

A Differential Drug Screen for Compounds That Select Against Antibiotic Resistance

Remy Chait, Shreya Shrestha, Aakash Kaushik Shah, Jean-Baptiste Michel, Roy Kishony, Paul J. Planet
2010 PLoS ONE  
We also thank Michael Baym, Tobias Bollenbach, Shugeng Cao, Jon Clardy, Michael Elowitz, Morten Ernebjerg, Tami Lieberman, Per Malkus, Chris Marx, Adam Palmer, and Elizabeth Shank for enlightening discussions  ...  We are grateful to Avigdor Eldar, Michael Elowitz, Elena Lozovsky, The Bacillus Genetic Stock Center, and the United States Department of Agriculture (USDA-ARS) for kind gifts of strains.  ...  (TIF) . 1 . 1 RDjapa LY, Basco LK, Zelikson R, Rosowsky A, Djaman JA, et al. (2007) Antifolate screening using yeast expressing Plasmodium vivax dihydrofolate reductase and in vitro drug susceptibility  ... 
doi:10.1371/journal.pone.0015179 pmid:21209699 pmcid:PMC2999542 fatcat:vwqv4adxwvh7td3jpzb3zfafma

Serine Hydroxymethyltransferase from Soybean Root Nodules : Purification and Kinetic Properties

M. K. Mitchell, P. H. S. Reynolds, D. G. Blevins
1986 Plant Physiology  
Acknowledgment-We wish to thank Dr Michael Boland for his help in analysis of kinetic data. LITERATURE CITED  ...  ZELIKSON R, M LUZZATI 1976 Two forms of a serine transhydroxymethylase, one absent in a thymidylate-less mutant of Saccharomyces cerevisiae.  ... 
doi:10.1104/pp.81.2.553 pmid:16664855 pmcid:PMC1075375 fatcat:twtq4nclx5g6hgihoqcxtqx6ki

Page 1153 of Mathematical Reviews Vol. , Issue Index [page]

Mathematical Reviews  
Ver Eecke) 86¢:58036 § 58E25 (49B27) Zelikson, M.S. (with Butkevich, A. V.) * Beunbie kanenmapu. (Russian) [Perpetual calendars] Second edition. ‘‘Nauka’’, Moscow, 1984. 207 pp. (Garry J.  ...  (Michael Jacobson) 86m:05061 05C35 (05C15) Graphs with prescribed neighbourhood graphs. Math. Slovaca 35 (1985), no. 2, 195-197. (J. Sedlééek) 86j:05096 05C38 Zelinskil, A.M. (with Kornyshev, Yu.  ... 

Page 2251 of Mathematical Reviews Vol. , Issue Author Index [page]

Mathematical Reviews  
(Anton Volgenant) 2001h:90102 90C35 (05C05, 68R10, 68W35) Zelikson, Shmuel Structures cristallines pour une classe d’indécomposables de U,(s{(2)).  ...  (Michael Tkatenko) 2001k:54065 AUTHOR INDEX 54H11 (03E50, 22A05, 54G05) — Partitions of groups into absolutely dense subsets. (Russian. Russian summary) Mat.  ... 
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