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Multi-gigahertz operation of 3-junction-interferometer-based Josephson latching logic circuits

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5 Author(s)
Hioe, W. ; Central Res. Lab., Hitachi Ltd., Tokyo, Japan ; Hosoya, M. ; Kominami, S. ; Nagaishi, H.
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Josephson latching logic gates require an ac power supply for correct operation. Owing to the difficulty in fabricating Josephson regulators for large power currents, multi-phase sinusoidal power supply is the preferred method for multi-gigahertz operation. However, the inherently variable ac power reduces device margin for covering process variations. As a result, there exists a strong relationship between circuit size, maximum operating frequency and circuit throughput for a given available margin. The trade-offs between these performance criteria are analyzed for 3-junction-interferometer-based logic gates. Experimental evaluation of the multi-gigahertz operation of small circuits showed that careful design of power supply networks that reduce power supply fluctuations will be needed to maximize performance. Simulation and experimental results are discussed.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:7 ,  Issue: 2 )

Date of Publication:

June 1997

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