Superconducting Magnetic Field Programmable Gate Array
Superconducting Magnetic Field Programmable Gate Array
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DOI：
10.1109/tasc.2018.2797262
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发表时间：
2018-03-01
影响因子：
1.8
通讯作者：
Pedram, Massoud
中科院分区：
文献类型：
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作者：
Katam, Naveen Kumar;Mukhanov, Oleg A.;Pedram, Massoud
现场可编程门阵列(现场可编程门阵列)为传统半导体电子中的各种应用提供了一种廉价得多的解决方案。单磁通量子(SFQ)技术正在迅速发展，针对单磁通量子(SFQ)的现场可编程门阵列(FPGA)的可用性将非常有用。为了开发这种SFQ专用的现场可编程门阵列，本文提出了SFQ电路同步和异步操作的新的FPGA子电路设计。磁约瑟夫森结(MJJ)被用作能量高效的快速SFQ(ERSFQ)偏置中的偏置限制结，以在所提出的FPGA结构的各个子电路中实现可编程开关。完成了各子电路的设计，并通过电路仿真验证了设计的正确性。此外，还为所有的FPGA电路模块开发了Verilog硬件描述语言(HDL语言)模型，以便于在所提出的FPGA结构上实现所需电路的大规模FPGA仿真。文中还给出了几个基于无损读出单元的带开关的子电路的设计，以便与基于MJJ开关的同类电路进行更好的比较。基于MJJ的开关的编程基于外部控制MJJ的临界电流的能力。最近提出了SFQ解码器的实现，用于在纵横制结构中通过电流线访问单个MJJ。与以前设计特定于SFQ的FPGA的尝试相比，对面积和功耗的估计要好得多。
Field-programmable gate arrays (FPGAs) provide a significantly cheaper solution for various applications in traditional semiconductor electronics. Single flux quantum (SFQ) technologies are developing rapidly and the availability of SFQ-specific FPGA will be very useful. Towards developing such an SFQ-specific FPGA, new designs of FPGA subcircuits for both synchronous and asynchronous operation of SFQ circuits are presented in this paper. Magnetic Josephson junctions (MJJs) are used as bias limiting junctions in energy-efficient rapid SFQ (ERSFQ) biasing to implement programmable switches in various subcircuits of the proposed FPGA fabric. Designs of all FPGA subcircuits are developed and are verified through circuit simulation. Verilog hardware description language (HDL) models are also developed for all FPGA circuit blocks to facilitate large-scale FPGA simulations for the implementation of the desired circuit on the proposed FPGA fabric. Designs of a few subcircuits with switches based on nondestructive readout cell are also given in the current paper for better comparison with MJJ switch based counterparts. Programming of MJJ-based switches is based on the ability to control the critical current of MJJs externally. Recent implementations of SFQ decoder is proposed for accessing individual MJJs through the current lines in a crossbar structure. Estimations for the area and power consumption are much better in comparison to previous attempts at designing an SFQ specific FPGA.