NDLI: The Effects of a DC Power Layer in a 10-Nb-Layer Device for SFQ LSIs

Content Provider	IEEE Xplore Digital Library
Author	Akaike, H. Shigehara, K. Fujimaki, A. Satoh, T. Hinode, K. Nagasawa, S. Hidaka, M.
Copyright Year	2002
Abstract	We have evaluated the effects of a DC power (DCP) layer in a 10-Nb-layer device using SQUIDs and large-scale Josephson transmission lines (LS-JTLs). The 10-Nb-layer device has recently been developed for SFQ LSIs, with an active layer including Josephson junctions (JJs) at the top, two passive transmission line layers in the middle, and the DCP layer for bias current feeds at the bottom. The evaluation with SQUIDs revealed that the 10-Nb-layer device structure drastically reduced the magnetic flux induced by DC currents flowing through the DCP line, in comparison with the previous advanced process device structure. A major factor for this reduction was an increase in the number of ground layers between the DCP layer and the active layer. In the test of the LS-JTLs containing about 12000 JJs, we obtained the operating margins as wide as numerically simulated ones. We also observed no difference in the margins between a method for extracting ground return currents through ground layers and that through the dedicated layer. These results demonstrated that the 10-Nb-layer device structure is suitable for SFQ-LSIs.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	594
Ending Page	597
Page Count	4
File Size	1414487
File Format	PDF
ISSN	10518223
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Niobium SQUIDs Fabrication Large-scale systems Power transmission lines Magnetic circuits Magnetic shielding Feeds Magnetic fields Planarization ten-Nb-layer device Device structure large-scale SFQ circuits magnetic fields
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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