论文信息 - 80-GHz Operation of an 8-Bit RSFQ Arithmetic Logic Unit

80-GHz Operation of an 8-Bit RSFQ Arithmetic Logic Unit

We have designed and demonstrated an arithmetic logic unit (ALU) based on rapid single-flux-quantum (RSFQ) technology. The ALU has been developed toward demonstration of high-performance information processing using a general purpose microprocessor CORE e4. The target operation frequency of the ALU is 50 GHz. In this paper, we present the design and high- speed functionality test results of the ALU. The ALU can execute 10 instructions. We aimed at high frequency operation with precise timing design using logic gates synchronized to the clock signal. The ALU contains 1555 Josephson junctions (JJs) and occupies a circuit area of 0.53mm2. We have demonstrated the correct operation of the ALU using on-chip high-speed test. The estimated maximum operating frequency based on measurement results is 80 GHz.

[1] T. V. Filippov,et al. 20 GHz operation of an asynchronous wave-pipelined RSFQ arithmetic-logic unit , 2012 .

[2] N. Yoshikawa,et al. 8-Bit Asynchronous Sparse-Tree Superconductor RSFQ Arithmetic-Logic Unit With a Rich Set of Operations , 2013, IEEE Transactions on Applied Superconductivity.

[3] Y. Yamanashi,et al. A single-flux-quantum logic prototype microprocessor , 2004, 2004 IEEE International Solid-State Circuits Conference (IEEE Cat. No.04CH37519).

[4] Kazuyoshi Takagi,et al. Design of single flux quantum cells for a 10-Nb-layer process , 2009 .

[5] V. Semenov,et al. RSFQ logic/memory family: a new Josephson-junction technology for sub-terahertz-clock-frequency digital systems , 1991, IEEE Transactions on Applied Superconductivity.

[6] Y. Yamanashi,et al. Design and Implementation of a Pipelined Bit-Serial SFQ Microprocessor, ${\rm CORE}1\beta$ , 2007, IEEE Transactions on Applied Superconductivity.

[7] Kazuyoshi Takagi,et al. Nb 9-Layer Fabrication Process for Superconducting Large-Scale SFQ Circuits and Its Process Evaluation , 2014, IEICE Trans. Electron..