Improved 1 V and 10 V Josephson voltage standard arrays

1 V and 10 V Josephson voltage standard arrays are fabricated on the basis of an improved design, using a modified technology. The Nb/Al2O3Nb 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 de voltage bias. A laboratory-made, oversized circular waveguide reduces the attenuation of the experimental set-up.