Proceedings of the First European Workshop on Low Temperature Electronics
J. Phys. IV France 04 (1994) C6-243-C6-248
Josephson voltage standard microwave circuit driven at 10 GHzH.-G. Meyer1, H.-J. Köhler1, G. Wende1, A. Chwala1, E. Vollmer2, U. Stumper2, K. Blüthner3 and P. Weber3
1 Institut für Physikalische Hochtechnologie e.V., Helmholtzweg 4, D-07743 Jena, Germany
2 Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-30116 Braunschweig, Germany
3 Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, D-07743 Jena, Germany
We have investigated a new type of microwave circuit for the generation of frequency-scaled Josephson voltages useful for the representation of highly accurate reference voltages. The circuit consists of a superconducting microstrip resonator and series arrays of Josephson junctions integrated within its rf current antinodes. The circuit is designed to operate at low frequencies of about 10 GHz to simplify the microwave techniques. At a resonator circuit with four Josephson junctions driven at 10.9 GHz we have obtained stable overlapping Shapiro steps up to 4.6 mV at a step width of about 70 µA. A more advanced double-resonator circuit with altogether 216 junctions allows to generate scaled reference voltages up to 0.16 V at steps of about 25 µA in width and at a microwave frequency of 11.1 GHz.
© EDP Sciences 1994