MISC

2009年6月

Operation of Toggle Flip-Flop Circuits Up to 500 GHz Based on Vertically-Stacked High-Temperature Superconductor Josephson Junctions

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
  • Taishi Kimura
  • ,
  • Kemmei Kajino
  • ,
  • Mitsuhiro Watanabe
  • ,
  • Yuki Horii
  • ,
  • Masumi Inoue
  • ,
  • Akira Fujimaki

19
3
開始ページ
127
終了ページ
130
記述言語
英語
掲載種別
DOI
10.1109/TASC.2009.2018252
出版者・発行元
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

We report a developed single-flux-quantum (SFQ) circuit fabrication process for vertically-stacked interface-treated Josephson junctions by using high-temperature superconductor (HTS) and also report the 500 GHz operation of a toggle flip-flop (TFF). As the first trial of the circuit operation, we fabricated TFF circuits, because TFF is used as a benchmark circuit to indicate potential of the circuit operating speed. To develop the circuit fabrication process, we utilized the counter YBCO layer as a wiring layer. We obtained resistively-shunted-junction behavior of single junction fabricated by new process. In addition, we observed current-voltage characteristics at the input port and the output port of the TFF, and confirmed that the input voltage coincided with twice the output voltage up to 1.1 mV at 4.2 K, which corresponds to the correct operation up to 500 GHz. This frequency is the highest value in HTS circuits ever observed, which suggests the high potential of the vertically-stacked JJs for the circuit operation.

Web of Science ® 被引用回数 : 2

リンク情報
DOI
https://doi.org/10.1109/TASC.2009.2018252
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000268282000002&DestApp=WOS_CPL
ID情報
  • DOI : 10.1109/TASC.2009.2018252
  • ISSN : 1051-8223
  • Web of Science ID : WOS:000268282000002

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