High-speed single-flux-quantum circuit using planarized niobium-trilayer Josephson junction technology
High-speed single-flux-quantum circuit using planarized niobium-trilayer Josephson junction technology
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采用平面化铌三层约瑟夫森结技术的高速单通量量子电路
DOI：
10.1063/1.114147
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发表时间：
1995
影响因子：
4
通讯作者：
W. H. Mallison
中科院分区：
文献类型：
--
作者：
P. Bunyk;A. Oliva;V. Semenov;M. Bhushan;K. Likharev;J. Lukens;M. Ketchen;W. H. Mallison
在平面化全耐火技术中实现了一个快速单通量量子逻辑系列的简单测试电路，只用了两个超导层和小的Nb/AlOx/Nb约瑟夫森结(名义上是1.5x1.5cm2)，临界电流密度Jcμ≊6kA/cm2。该集成电路采用了特殊的版图设计(包括SFQ脉冲发生器、约瑟夫森传输线和T触发器)，以减少由于没有接地面而产生的3D电感。对于不同结参数的样品，SFQ脉冲串的最大频率范围为200~370 GHz，可被触发器除以2。
A simple test circuit of the rapid single‐flux‐quantum (RSFQ) logic family has been implemented in a planarized all‐refractory technology using only two superconducting layers and small Nb/AlOx/Nb Josephson junctions (nominally 1.5×1.5 μm2) with critical current density jc≊6 kA/cm2. A special layout design of the integrated circuit (including a SFQ pulse generator, Josephson transmission line, and T flip–flop) was used to reduce 3D inductances resulting from absence of the ground plane. For samples with various junction parameters, the maximum frequency of the SFQ pulse train, which could be divided by 2 by the flip–flop, ranged from 200 to 370 GHz.