Title :
A fast Josephson SFQ shift register
Author :
Kuo, F. ; Whiteley, S.R. ; Faris, S.M.
Author_Institution :
HYPRES Inc., Elmsford, NY, USA
fDate :
3/1/1989 12:00:00 AM
Abstract :
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
Keywords :
aluminium compounds; niobium; shift registers; superconducting junction devices; superconducting logic circuits; 70 GHz; DC biased; Josephson SFQ shift register; Nb-AlOx-Nb junctions; SNEAP process; SQUID; data latch; data storage; offset; operating frequency; operating margins; shift register circuit; single flux quantum; superconducting quantum interference device; test cell; two-phase power; two-phase sinusoidal clock; Circuit testing; Clocks; Interference; Josephson junctions; Latches; Memory; Niobium; SQUIDs; Shift registers; Superconducting devices;
Journal_Title :
Magnetics, IEEE Transactions on
