High Speed Operation of Single Flux Quantum Multiple Input Merger Using a Magnetically Coupled SQUID Stack
High Speed Operation of Single Flux Quantum Multiple Input Merger Using a Magnetically Coupled SQUID Stack
复制标题
使用磁耦合 SQUID 堆栈的单通量量子多输入合并器的高速运行
DOI：
10.1109/tasc.2015.2398675
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
and N. Yoshikawa
中科院分区：
文献类型：
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作者：
K. Sato;Y. Yamanashi;and N. Yoshikawa
我们研究了一个单通量量子（SFQ）多输入合并约瑟夫森传输线（JTL），磁耦合到JTL的dc-SQUID堆栈，和一个dc/SFQ转换器组成。新的合并器可以更有效地合并许多输入信号比传统的合并器电路，这是一个双输入SFQ汇合缓冲器（CB）。本文通过模拟电路仿真，对多输入合并器进行了优化设计。电路仿真结果表明，使用多达16个输入的合并器可以正确地操作。我们实现了测试电路，并展示了一个四输入合并器在高达23.3 GHz的输入频率的高速操作。我们评估了一个实际的多输入合并电路的延迟时间和电路规模使用新设计的合并器和传统的合并电路SFQ存储系统。如果我们设计一个4096输入合并电路使用16输入合并电路树，我们可以减少延迟时间，约瑟夫森结（JJ）的数量，并合并电路的总功耗相比，基于传统的CB树的合并电路。延迟、JJ和总功率的减少率分别约为11%、35%和53%。
We investigated a single flux quantum (SFQ) multiinput merger composed of Josephson transmission lines (JTLs), a dc-SQUID stack magnetically coupled to the JTLs, and a dc/SFQ converter. The new merger can more efficiently merge many input signals than a conventional merger circuit, which is a two-input SFQ confluence buffer (CB). In this paper, we optimized and designed the multi-input merger according to an analog circuit simulation. The circuit simulation results show that the merger using up to 16 inputs can correctly operate. We implemented the test circuit and demonstrated a high-speed operation of a four-input merger at an input frequency of up to 23.3 GHz. We evaluated the delay time and the circuit scale of a practical multi-input merging circuit using the newly designed merger and the conventional merging circuit for an SFQ memory system. If we design a 4096-input merging circuit using a 16-input merger circuit tree, we can reduce the delay time, the number of Josephson junctions (JJs), and the total power dissipation of the merging circuit compared with the merging circuit based on a conventional CB tree. The reduction rates of the delay, the JJs, and the total power are approximately 11%, 35%, and 53%, respectively.