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High-speed operation of demultiplexer up to 56 GHz

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3 Author(s)
F. Furuta ; Adv. Res. Lab., Hitachi Ltd., Kokubunji Tokyo, Japan ; K. Saitoh ; K. Takagi

A 1-to-4 demultiplexer (DEMUX) was designed based on Single Flux Quantum (SFQ) circuitry and high-speed operation was confirmed using on-chip testing. The circuit was designed with a binary-tree structure to enable high-speed operation. We also investigated timing between clock and data signals in detail. Monte Carlo simulation was applied to vary the design parameters pseudo-randomly and the spread of timing was obtained by circuit simulation. Even if the circuit parameters varied as a result of the fabrication process, proper timing was maintained by optimizing the length of Josephson transmission line. The 1-to-4 DEMUX we fabricated distributed data signals correctly at operating frequencies up to 56 GHz with a bias margin of ±7%.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:13 ,  Issue: 2 )