超导单磁通量子数字电路的全加器设计与应用探索  

Design and Application of Full Adder in Single Flux Quantum Circuits

作　　者：杨若婷 任洁[1,2,3] 高小平[1,2] 王镇 YANG Ruo-ting;REN Jie;GAO Xiao-ping;WANG Zhen(State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China;Center for Excellence in Superconducting Electronics,Chinese Academy of Sciences,Shanghai 200050,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海微系统与信息技术研究所信息功能材料国家重点实验室,上海200050 [2]中国科学院超导电子学卓越创新中心,上海200050 [3]中国科学院大学,北京100049

出　　处：《电子学报》2023年第2期307-313,共7页Acta Electronica Sinica

基　　金：中国科学院战略性先导科技专项(A类)-超导计算机研发(No.XDA18000000);上海市科学技术委员会科研计划项目-超导SFQ器件与小规模集成电路基础研究(No.17JC1401100)。

摘　　要：随着超导单磁通量子(Single Flux Quantum,SFQ)数字电路的集成度规模不断提升,基于SFQ标准单元库及知识产权(Intellectual Property,IP)电路的设计将会逐渐取代原有的专用定制化数字电路设计的方式.与此同时,IP电路也可以作为新设计方法研究和新工艺及单元库可靠性的验证电路.本文选择大规模数字电路中的基础运算单元全加器为研究对象,希望能在尚在开发中的工艺下得到一个更加稳定工作和完整测试功能的全加器.本文基于自研SIMIT Nb03工艺上开发的SFQ单元库,设计了两种类型的全加器,且实现了全加器逻辑功能和工作性能的低频与高频测试表征.本文的第二种单级型全加器跟同类型的其他全加器相比,在保证了结数量和面积消耗偏小的优势下,又减少了设计难度和便于灵活扩展,使得其在电路IP化使用中也具有指导意义.低频测试结果表明,两种全加器均正确工作,其中单级型全加器具备良好的工作阈值.该款全加器的高频测试显示电路最高工作频率可达22 GHz.本文对测试结果进行详细分析,并基于此针对大规模电路实现开展简单应用探索.With the increase of integration of SFQ(Single Flux Quantum)digital circuits,large scale SFQ circuits design flow based on standard cell library and IP(Intellectual Property)is gradually replacing the full custom flow that is widely used in ASIC design.Meanwhile,IP circuits are also playing important roles in robustness verification of cell library of new fabrication process as benchmark circuits.As one of the most fundamental arithmetic elements,full adder(FA)is considered to be a significant IP that provides some guidelines for large scale circuits’design,and we hope to design a stable working FA with complete correct test function under our developing fabrication process.In this paper,we have demonstrated two kinds of FA using our SIMIT Nb03 cell library,and tested their logic function and working performance under both low and high frequency clock.Compared to other FAs of the same type,our single-stage FA reduces the design difficulty and is flexible to expand while keeping the advantages of less junctions and smaller area consumption,making it instructive in IP usage.Our two FAs have tested correct function under low frequency clock,and the single-stage FA has wide working margin.The high frequency test results indicate that the single-stage FA is able to work up to 22GHz clock frequency.Whereafter,analysis of test results is discussed,and the application exploration of large-scale circuits is carried out in the last.

关 键 词：超导数字电路 单磁通量子电路 知识产权电路 自研工艺 全加器 

分 类 号：TP331.2[自动化与计算机技术—计算机系统结构]