Repeater Insertion in SFQ Interconnect
Repeater Insertion in SFQ Interconnect
复制标题
SFQ 互连中的中继器插入
DOI：
10.1109/tasc.2020.3000982
复制
发表时间：
2020
影响因子：
1.8
通讯作者：
E. Friedman
中科院分区：
文献类型：
--
作者：
T. Jabbari;G. Krylov;S. Whiteley;J. Kawa;E. Friedman
超导无源传输线（PTL）广泛应用于大规模快速单通量量子（RSFQ）电路中的信号路由。由于驱动器和接收器之间的传输线不完全匹配，单通量量子（SFQ）脉冲被部分反射。这些反射的往返传播时间可以与下面的SFQ脉冲重合，导致偏置余量减少或不正确的电路行为。这种谐振效应取决于PTL的长度和信号的时钟频率。减少和管理这种影响的方法是本文的重点。给出了谐振频率与PTL长度关系的封闭表达式。这个表达式描述了RSFQ电路中PTL互连段的一组禁止长度。提出的方法和算法在保证线段长度在禁止区域之外并增加偏置余量的同时，将有源ptl中继器插入到长超导互连中。
Superconductive passive transmission lines (PTL) are widely used for signal routing in large-scale rapid single flux quantum (RSFQ) circuits. Due to the imperfect matching of the transmission lines between the driver and receiver, single flux quantum (SFQ) pulses are partially reflected. The round trip propagation time of these reflections can coincide with the following SFQ pulse, resulting in a decrease in bias margins or incorrect circuit behavior. This resonant effect depends upon the length of the PTL and the clock frequency of the signal. A methodology to reduce and manage this effect is the focus of this article. A closed-form expression describing the dependence of the resonance frequency on the length of the PTL is presented. This expression describes a set of forbidden lengths for PTL interconnect segments in RSFQ circuits. The proposed methodology and algorithm insert active PTL-based repeaters into long superconductive interconnect while ensuring the length of the line segment is outside the forbidden region and increasing bias margins.