Title :
Josephson 8-bit shift register
Author :
Fujimaki, Norio ; Kotani, Seigo ; Imamura, Takeshi ; Hasuo, Shinya
fDate :
10/1/1987 12:00:00 AM
Abstract :
A Josephson 8-bit shift register for use in Josephson computers and signal processors is described. The gates used in the circuit are modified variable threshold logic (MVTL) gates fabricated by 2.5-μm Nb/AlO/SUB x//Nb junction technology with Mo resistors and SiO/SUB 2/ insulation. They are driven by a three-phase power supply. The shift register has 112 gates and occupies a 1.1×2.1-mm/SUP 2/ area. Correct shift, load, hold, and clear operations were experimentally confirmed for all bits. The circuit operated at a clock frequency up to 2.3 GHz. Its power consumption was 1.8 mW. This power level is two or three orders of magnitude lower than for Si or GaAs shift registers.
Keywords :
Josephson effect; Shift registers; Superconducting junction devices; Superconducting logic circuits; shift registers; superconducting junction devices; superconducting logic circuits; Clocks; Insulation; Josephson junctions; Logic circuits; Logic gates; Niobium; Power supplies; Resistors; Shift registers; Signal processing;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.1987.1052829
