Title :
Improved 1 V and 10 V Josephson voltage standard arrays
Author :
Kohlmann, J. ; Muller, F. ; Gutmann, P. ; Popel, R. ; Grimm, L. ; Dunschede, F.-W. ; Meier, W. ; Niemeyer, J.
Author_Institution :
Phys. Tech. Bundesanstalt, Braunschweig, Germany
fDate :
6/1/1997 12:00:00 AM
Abstract :
1 V and 10 V Josephson voltage standard arrays are fabricated on the basis of an improved design, using a modified technology. The Nb/Al/sub 2/O/sub 3//Nb trilayer is deposited directly on the Si wafer. The edges of the base electrodes are insulated by an anodization process. The maximum step voltage increases linearly with the external microwave voltage. Switching between different voltage levels is possible by simple switching of the dc voltage bias. A laboratory-made, oversized circular waveguide reduces the attenuation of the experimental set-up.
Keywords :
alumina; anodisation; measurement standards; millimetre wave measurement; niobium; superconducting microwave devices; superconductor-insulator-superconductor devices; voltage measurement; 1 V; 10 V; 70 to 94 GHz; Josephson voltage standard arrays; Nb-Al/sub 2/O/sub 3/-Nb; Nb/Al/sub 2/O/sub 3//Nb trilayer; Si; Si wafer; anodization process; attenuation reduction; base electrode edges; dc voltage bias switching; direct deposition; external microwave voltage; maximum step voltage; oversized circular waveguide; voltage level switching; Electrodes; Fabrication; Frequency; Insulation; Josephson junctions; Microwave oscillators; Niobium; Reproducibility of results; Stripline; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
