Title :
Josephson pseudorandom bit-sequence generator
Author :
Fujimaki, Norio ; Imamura, Takeshi ; Hasuo, Shinya
Author_Institution :
Fujitsu Ltd., Atsugi, Japan
fDate :
6/1/1988 12:00:00 AM
Abstract :
A nine-bit Josephson pseudorandom bit-sequence generator for use in Josephson computers and signal processors is described. The gates used in the circuit are modified variable threshold logic (MVTL) gates fabricated using 2.5- mu m 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 circuit consists of 66 gates and its area is 4.2*0.5 mm/sup 2/. Correct bit sequences with one period of 2/sup 9/-1=511 clocks were obtained. Its power consumption was 0.9 mW. The circuit operated at a clock frequency of up to 2.2 GHz.<>
Keywords :
Josephson effect; aluminium compounds; niobium; shift registers; signal generators; superconducting junction devices; superconducting logic circuits; 0.9 mW; 2.2 GHz; 2.5 micron; 9 bit; Josephson computers; MVTL gates; Mo resistors; Nb-AlO/sub x/-Nb junction technology; SiO/sub 2/ insulation; clock frequency; feedback circuit; pseudorandom bit-sequence generator; shift register; signal processors; superconducting junction device; three-phase power supply; variable threshold logic; Clocks; Energy consumption; Insulation; Josephson junctions; Logic circuits; Logic gates; Power supplies; Resistors; Signal generators; Signal processing;
Journal_Title :
Solid-State Circuits, IEEE Journal of
