Development of Passive Interconnection Technology for SFQ Circuits

Yoshihito HASHIMOTO  Shinichi YOROZU  Yoshio KAMEDA  Akira FUJIMAKI  Hirotaka TERAI  Nobuyuki YOSHIKAWA  

IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.2   pp.198-207
Publication Date: 2005/02/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.2.198
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on Superconducting Electronic Devices and Their Applications)
SFQ,  integrated circuit,  interconnection,  superconductor,  passive transmission line,  

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To enable the use of passive transmission lines (PTLs) for the interconnection of single-flux-quantum (SFQ) circuits, we have implemented a driver and a receiver and have developed a method for designing SFQ circuits with passive interconnections. Basic components and properties of passive interconnections, such as the frequency characteristics of the driver and receiver, the PTL delay, and the crosstalk between PTLs, have been experimentally verified. Our developed components and design method have been applied to actual SFQ circuits, such as a 44 switch having block-to-block passive interconnections and a 22 switch having gate-to-gate passive interconnections. We have also shown the advantages of PTLs over Josephson transmission lines (JTLs). We also discuss the prospects of SFQ circuits having passive interconnections.