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Physica C Superconductivity

New type of SFQ-dc converter for use in oxide circuits

Y. Tarutani, Yoshihiro Ishimaru, H. Wakana, Seiji Adachi, Ken‐ichi Nakayama, Yasuo Oshikubo, Osami Horibe, Y. Morimoto, K. Tanabe

Published Jun 3, 2004• 13 citations
Publisher
DOI
10.1016/j.physc.2004.01.151

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Basic SFQ circuit components, such as SFQ-dc converter, set-reset flip-flop (RS-FF), confluence buffer and splitter, have been fabricated by the YBa/sub 2/Cu/sub 3/O/sub 7-x/-ramp-edge-junction technology and their logic operations were investigated. Circuit parameters were optimized in order to widen the margins of these oxide SFQ circuit components. The SFQ-dc converter that comprised double SQUIDs connected in series showed the output voltage as much as 0.3 mV at 22 K owing to high I/sub c/R/sub n/ value of the ramp-edge junction. Logic operations of the RS-FF, the confluence buffer and the splitter were correctly performed by using the SFQ-dc converter. Finite operating margins were obtainable for these circuits up to the temperature near 30 K.

IEEE Transactions on Applied Superconductivity•Jun 1, 2005•21 citations
Basic SFQ circuit components, such as SFQ-dc converter, set-reset flip-flop (RS-FF), confluence buffer and splitter, have been fabricated by the YBa/sub 2/Cu/sub 3/O/sub 7-x/-ramp-edge-junction technology and their logic operations were investigated. Circuit parameters were optimized in order to widen the margins of these oxide SFQ circuit components. The SFQ-dc converter that comprised double SQUIDs connected in series showed the output voltage as much as 0.3 mV at 22 K owing to high I/sub c/R/sub n/ value of the ramp-edge junction. Logic operations of the RS-FF, the confluence buffer and the splitter were correctly performed by using the SFQ-dc converter. Finite operating margins were obtainable for these circuits up to the temperature near 30 K.