Title :
Josephson 4-bit digital counter circuit made by Nb/Al-oxide/Nb junctions
Author :
Nakagawa, H. ; Kurosawa, I. ; Takada, S. ; Hayakawa, H.
Author_Institution :
Electrotechnical Laboratory, Ibaraki, Japan
fDate :
3/1/1987 12:00:00 AM
Abstract :
A new Josephson 4-bit digital counter circuit has been demonstrated. Direct-coupled data-latch units which consists of a four-junction logic(4JL) gate family are utilized to make a flip-flop circuit for counting. The counter is designed to be driven by a two-phase mono-polar power supply. The counter circuit has been fabricated using 3μm-Nb/Al-oxide/Nb junction process. The counter has three operating modes of counting, data-loading and clearing which can be adapted to Josephson digital logic system. Experimental tests have been carried out successfully for these operating modes. Computer simulations indicate that the 4-bit counter operates in 315ps.
Keywords :
Counting circuits; Josephson device logic; Counting circuits; Flip-flops; Laboratories; Latches; Logic circuits; Niobium; Power supplies; Superconducting logic circuits; Switches; Switching circuits;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.1987.1064919
