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A fast Josephson SFQ shift register

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3 Author(s)
Kuo, F. ; HYPRES Inc., Elmsford, NY, USA ; Whiteley, S.R. ; Faris, S.M.

A Josephson SFQ (single flux quantum) shift register circuit operating under a two-phase power was designed and tested. The test cell was fabricated using the Nb/AlOx/Nb junction SNEAP process. The main data latch is DC biased; the data storage is accomplished by the transfer of a single flux quantum in or out of a SQUID (superconducting quantum interference device) superconducting loop. A two-phase sinusoidal clock with offset is used to operate the circuit. Simulations verify that the operating frequency can go beyond 70 GHz, with operating margins exceeding 20%. Preliminary measurements indicate that the circuit operates as intended

Published in:

Magnetics, IEEE Transactions on  (Volume:25 ,  Issue: 2 )

Date of Publication:

Mar 1989

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