Title :
A 512-bit shift register using compact two-phase single flux quantum clock generators with large margins and low power
Author_Institution :
Hypres Inc., Elmsford, NY, USA
Abstract :
A 512-b shift register was built and tested up to 14.5 GHz. The shift register uses a two-phase clock which is generated by coupling a master control line over many asymmetrically biased two-junction SQUIDs. Compared with other shift registers with Josephson transmission lines to deliver clock, this new clock system provides short delay, low power dissipation, and large DC bias margins. The shift register uses about 3000 Nb/AlO/sub x//Nb Josephson junctions and consumes about 0.1 mW.<>
Keywords :
Josephson effect; SQUIDs; aluminium compounds; clocks; niobium; shift registers; superconducting logic circuits; synchronisation; 0.1 mW; 14.5 GHz; Josephson transmission lines; Nb-AlO-Nb; Nb/AlO/sub x//Nb Josephson junctions; asymmetrically biased SQUIDs; low power dissipation; shift register; two-junction SQUIDs; two-phase clock; two-phase single flux quantum clock generators; Clocks; Couplings; Delay systems; Josephson junctions; Niobium; Power dissipation; Power transmission lines; SQUIDs; Shift registers; Testing;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
