Flexible Superconducting Passive Interconnects with 50-Gb/s Signal Transmissions in Single-Flux-Quantum Circuits
Flexible Superconducting Passive Interconnects with 50-Gb/s Signal Transmissions in Single-Flux-Quantum Circuits
复制标题
在单通量量子电路中实现 50 Gb/s 信号传输的柔性超导无源互连
DOI：
10.1143/jjap.45.752
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发表时间：
2006
影响因子：
1.5
通讯作者：
S. Yorozu
中科院分区：
文献类型：
--
作者：
Takahiro Yamada;Hirofumi Ryoki;A. Fujimaki;S. Yorozu
我们开发了一种非常灵活的单通量量子（SFQ）电路中的无源传输线（PTL）布线技术。为了提高布线的灵活性，我们介绍了两种类型的布线结构的带状线（SL）和微带线（MSL）使用的制造工艺，其中有四个金属层。SL和MSL分别使用从底部开始的第二和第四金属层作为信号线来实现（另外两个金属层用作接地平面）。我们还介绍了SL和MSL之间的传输通孔。为了解决SFQ脉冲在驱动器（接收器）和SL末端（MSL）之间的接头和通孔等复杂不连续部分上的阻抗失配问题，我们优化了这些不连续部分的结构并评估了传播特性，以确保SFQ脉冲的高速传输。我们测试了SFQ脉冲通过SL/MSL的传输，SL/MSL包括50多个通孔，这是实际设计中最复杂的线路之一。我们证实了SFQ脉冲的良好传输特性高达50 Gb/s，具有足够宽的±20%的偏置裕度，可用于实际设计。
We have developed a very flexible wiring technique of passive transmission lines (PTLs) in single-flux-quantum (SFQ) circuits. For high flexibility, we introduced two types of wiring structures of strip lines (SLs) and microstrip lines (MSLs) using the fabrication process which has four metal layers. The SLs and MSLs are realized using the second and fourth metal layers as signal lines, respectively, from the bottom (the other two metal layers are used as ground planes). We also introduced via-holes for transmission between the SL and MSL. For solving the problem of impedance mismatch on complicated discontinuous sections such as joints [between the driver(receiver) and the end of SLs(MSLs)] and via-holes, we optimized the structures of these discontinuous sections and evaluated propagation properties to ensure high-speed transmission of SFQ pulses. We tested the transmission of SFQ pulses through SLs/MSLs including more than 50 via-holes, one of the most complicated lines in actual designs. We confirmed the good propagation properties of SFQ pulses up to 50 Gb/s with sufficiently wide bias margins of ±20% to be used in practical designs.