Title :
Linearity of quantized voltages generated by a Josephson-junction array
Author :
Sakamoto, Yasuhiko ; Endo, Tadashi ; Murayama, Yasushi ; Sakuraba, Toshiaki
Author_Institution :
Electrotech. Lab. Ibaraki, Japan
fDate :
4/1/1989 12:00:00 AM
Abstract :
A measurement system is proposed to examine experimentally the linearity of quantized voltages generated by a Josephson-junction array at 100 MV and 1 V with an accuracy better than 1×10-8. Ten resistors, connected in series, are driven by a constant-current source and the total voltage drop is compared with the sum of the voltages across each resistor. A preliminary experiment at the 0.2-p.p.m. level was performed. The main cause of the lower accuracy than expected was the instability of the junction array´s voltages, which seems to be attributable to imperfect cryostat design
Keywords :
Josephson effect; cryostats; measurement standards; superconducting junction devices; voltage measurement; 1 V; 100 MV; Josephson-junction array; constant-current source; cryostat design; instability; linearity; measurement standards; quantized voltages; voltage drop; voltage measurement; Current measurement; Current supplies; Current-voltage characteristics; Electrical resistance measurement; Frequency; Josephson junctions; Linearity; Resistors; Voltage measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
