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首页> 外文期刊>Physica, C. Superconductivity and its applications >Control of return current flows in the single-flux-quantum circuits using positiveegative bias supply lines
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Control of return current flows in the single-flux-quantum circuits using positiveegative bias supply lines

机译：使用正/负偏置电源线控制单通量量子电路中的回流电流

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摘要

We propose a technique to use both positive and negative dc bias supply lines in single-flux-quantum (SFQ) circuits aiming to suppress stray return currents flowing on a ground plane. Negative bias lines are placed in parallel with positive ones, and are used to extract return currents immediately from a ground contact near each bias feeding point. We tested a large-scale shift register fabricated using the SRL 4-layer niobium standard process in three different ways to supply bias currents: did not apply any negative bias Currents. and applied negative bias currents to ground contacts (conventional) and to the negative bias lines (proposed). The experimental results showed that the shift register never operated without negative bias currents, and the operating margin was improved in the proposed way of bias current supply. It suggests that unpredictable stray return currents can flow in the complicated layouts even when we apply negative bias currents in the conventional way, and careful control of the return current flows is required in large-scale SFQ circuits.
机译：我们提出一种在单通量量子（SFQ）电路中同时使用正和负dc偏置电源线的技术，旨在抑制在接地平面上流动的杂散返回电流。负偏置线与正偏置线平行放置，用于立即从每个偏置馈电点附近的接地触点提取返回电流。我们测试了使用SRL 4层铌标准工艺以三种不同方式提供偏置电流而制造的大规模移位寄存器：没有施加任何负偏置电流。并向接地触点（常规）和负偏置线（建议）施加负偏置电流。实验结果表明，在没有负偏置电流的情况下，移位寄存器永远不会工作，并且所提出的偏置电流供应方式提高了工作裕度。这表明，即使我们以常规方式施加负偏置电流，也无法在复杂的布局中流过不可预测的杂散返回电流，并且在大型SFQ电路中需要仔细控制返回电流的流动。

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