A compact AQFP logic cell design using an 8-metal layer superconductor process
A compact AQFP logic cell design using an 8-metal layer superconductor process
复制标题
采用 8 金属层超导工艺的紧凑型 AQFP 逻辑单元设计
DOI：
10.1088/1361-6668/ab6feb
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发表时间：
2020
影响因子：
3.6
通讯作者：
N. Yoshikawa
中科院分区：
文献类型：
--
作者：
Yuxing He;C. Ayala;N. Takeuchi;Taiki Yamae;Yuki Hironaka;A. Sahu;Vikram Gupta;A. Talalaevskii;D. Gupta;N. Yoshikawa
绝热量子流参变子（AQFP）是一种基于量子流参变子的绝热逻辑。它具有极低的开关能量，以及高信号增益和高鲁棒性。在这项工作中，我们提出了一个AQFP单元库的开发使用麻省理工学院LL 100 μA μm−2超导电子制造工艺，SFQ 5ee。设计了缓冲器、反相器、常量和分支四种基本子单元作为组合AQFP逻辑单元的构建模块。利用8个金属层的优势，我们将直流超导量子干涉器件（SQUID）的缓冲器的一部分，在接地平面和接地平面以下的信号Transformer部分，以减轻不必要的耦合。另外，通过将信号Transformer和直流SQUID垂直叠加，缓冲器的尺寸减小到15 μm × 20 μm，仅为传统设计的30%。更复杂的AQFP逻辑单元，如多数门，与门，或门，是通过将子单元排列在一起来设计的。通过仿真和实验，证实了所建立的AQFP逻辑单元的正确操作和宽的激励电流裕度。
Adiabatic quantum-flux-parametron (AQFP) is an adiabatic logic based on the quantum-flux-parametron. It has extremely low switching energy, as well as high signal gain and high robustness. In this work, we present the development of an AQFP cell library using the MIT LL 100 μA μm−2 superconductor electronics fabrication process, SFQ5ee. Four types of basic sub-cells, i.e. buffer, inverter, constant, and branch, are designed as the building blocks for combinational AQFP logic cells. Taking advantage of the 8 metal layers, we place the dc superconducting quantum interference device (SQUID) part of a buffer above the ground plane and the signal transformer part below the ground plane to mitigate unwanted couplings. In addition, by vertically overlapping the signal transformer and the dc SQUID, the dimension of a buffer is reduced to 15 μm × 20 μm, which is only 30% of that of the conventional design. More complex AQFP logic cells, such as the majority gate, AND gate, and OR gate, are designed by arraying the sub-cells together. Correct operations and wide excitation current margins are confirmed for the established AQFP logic cells by both simulation and experiments.