Design methodology of single-flux-quantum flip-flops composed of both 0- and π-shifted Josephson junctions
Design methodology of single-flux-quantum flip-flops composed of both 0- and π-shifted Josephson junctions
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由 0 位移和 π 位移约瑟夫森结组成的单通量量子触发器的设计方法
DOI：
10.1088/1361-6668/aad78d
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发表时间：
2018
影响因子：
3.6
通讯作者：
Yoshikawa Nobuyuki
中科院分区：
文献类型：
--
作者：
Yamanashi Yuki;Nakaishi Sotaro;Sugiyama Akira;Takeuchi Naoki;Yoshikawa Nobuyuki
研究了由常规（0-）和π位移约瑟夫森结组成的单通量量子（SFQ）触发器的设计方法。研究了超导逻辑电路中二进制逻辑状态表示所必需的磁通量子存储回路的实现方法。由于所有SFQ触发器都有存储回路，因此所研究的设计方法可以应用于它们的设计。我们设计了几个SFQ触发器组成的0和π位移约瑟夫森结使用研究的设计方法。所设计的SFQ触发器的性能进行了定量评估，使用模拟电路模拟器，我们开发的。我们证实了由0和π位移约瑟夫森结组成的各种SFQ触发器的正确操作，具有宽的操作裕度。此外，我们观察到，所研究的设计方法是适合的SFQ触发器的互补输出，因为0-和π-移位约瑟夫森结组成的存储回路具有对称的结构，互补输出功能可以通过使用存储回路来实现。我们的研究表明，非破坏性读出触发器与互补输出（NDROC）的约瑟夫森结的数量和静态功耗可以减少到不到一半的传统NDROC，其中有两个存储环的0-约瑟夫森结组成，以实现互补输出功能。所研究的设计方法不仅适用于SFQ电路，而且适用于其他超导逻辑电路和新型可重构逻辑器件。
A methodology for designing single-flux-quantum (SFQ) flip-flops composed of both conventional (0-) and π-shifted Josephson junctions is investigated. We investigated the implementation of a storage loop, which can store flux quantum and is indispensable to express binary logic states in superconductor logic circuits. As all SFQ flip-flops have storage loops, the investigated design methodology can be applied to their design. We designed several SFQ flip-flops composed of 0-and π-shifted Josephson junctions using the investigated design methodology. The performances of the designed SFQ flip-flops were quantitatively evaluated by using an analog circuit simulator which we developed. We confirmed the correct operation of various SFQ flip-flops composed of 0-and π-shifted Josephson junctions with wide operating margins. Moreover, we observed that the investigated design methodology is suitable for SFQ flip-flops with complementary outputs because a storage loop composed of both 0-and π-shifted Josephson junctions has a symmetric structure and the complementary output function can be realized by using the storage loop. Our investigation indicates that the number of Josephson junctions and static power consumption of a non-destructive read-out flip-flop with complementary outputs (NDROC) can be reduced to less than half of those of the conventional NDROC, which has two storage loops composed of 0-Josephson junctions, to realize the complementary output function. The investigated design methodology is expected to be applied to not only SFQ circuits but also other superconducting logic circuits and novel reconfigurable logic devices using programmable 0-π Josephson junctions.
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