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Design Methodology for Distributed Large-Scale ERSFQ Bias Networks

机译:分布式大规模ERSFQ偏置网络的设计方法

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Rapid single-flux quantum (RSFQ) circuits have recently attracted considerable attention as a promising cryogenic beyond CMOS technology for exascale computing. Energy-efficient RSFQ (ERSFQ) is an energy-efficient, inductive bias scheme for RSFQ circuits, where the power dissipation is drastically lowered by eliminating the bias resistors, while the cell library remains unchanged. An ERSFQ bias scheme requires the introduction of multiple circuit elements—current limiting Josephson junctions, bias inductors, and feeding Josephson transmission lines (FJTLs). In this article, parameter guidelines and design techniques for ERSFQ circuits are presented. The proposed guidelines enable more robust circuits resistant to severe variations in supplied bias currents. Trends are considered, and advantageous tradeoffs are discussed for the different components within a bias network. The guidelines provide a means to decrease the size of an FJTL and, thereby, reduce the physical area, power dissipation, and overall bias currents, supporting further increases in circuit complexity. A distributed approach to ERSFQ FJTL is also presented to simplify placement and minimize the effects of the parasitic inductance of the bias lines. This methodology and related circuit techniques are applicable to automating the synthesis of bias networks to enable large-scale ERSFQ circuits.
机译:快速的单通量量子(RSFQ)电路最近引起了相当大的关注,因为exascale计算的CMOS技术超出CMOS技术。节能RSFQ(ERSFQ)是RSFQ电路的节能电感偏置方案,其中通过消除偏置电阻器,电力耗散量大,而细胞库保持不变。 ERSFQ偏置方案要求引入多个电路元素限制约瑟夫森结,偏置电感器和馈送约瑟夫森传输线(FJTL)。在本文中,介绍了ERSFQ电路的参数指南和设计技术。拟议的指导方针使得能够抵抗更强大的电路对提供的偏置电流的严重变化。考虑趋势,并且在偏置网络中的不同组件讨论了有利的权衡。指导原则提供了一种减少FJT1的尺寸的方法,从而降低物理区域,功耗和整体偏置电流,支持电路复杂性的进一步增加。还提出了一种分布式方法,以简化放置并最小化偏置线的寄生电感的影响。该方法和相关电路技术适用于自动化偏置网络的合成,以实现大规模的ERSFQ电路。

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