50 GHz Demonstration of an Integer-Type Butterfly Processing Circuit for an FFT Processor Using the 10 kA/cm2 Nb Process


IEICE TRANSACTIONS on Electronics   Vol.E98-C   No.3   pp.232-237
Publication Date: 2015/03/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E98.C.232
Type of Manuscript: Special Section PAPER (Special Section on Leading-Edge Applications and Fundamentals of Superconducting Sensors and Detectors)
SFQ circuits,  Josephson integrated circuit,  FFT processor,  butterfly processing circuit,  

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We are developing a fast Fourier transform (FFT) processor using high-speed and low-power single-flux-quantum (SFQ) circuits. Our main concern is the development of an SFQ butterfly processing circuit, which is the core processing circuit in the FFT processor. In our previous study, we have confirmed the complete operation of an integer-type butterfly processing circuit using the AIST 2.5 kA/cm2 Nb standard process at the frequency of 25 GHz. In this study, we have designed an integer-type butterfly processing circuit using the AIST 10 kA/cm2 Nb advanced process and confirmed its high-speed operation at the maximum frequency of 50 GHz.