Title :
Josephson Series Arrays for Programmable 10-V SINIS Josephson Voltage Standards and for Josephson Arbitrary Waveform Synthesizers Based on SNS Junctions
Author :
Kohlmann, Johannes ; Müller, Franz ; Kieler, Oliver ; Behr, Ralf ; Palafox, Luis ; Kahmann, Martin ; Niemeyer, Jürgen
Author_Institution :
Phys.-Technische Bundesanstalt, Braunschweig
fDate :
4/1/2007 12:00:00 AM
Abstract :
Programmable Josephson voltage standards for output voltages up to 10 V have been realized. Binary-divided series arrays consisting of 69 632 overdamped SINIS Josephson junctions have been fabricated using reliable Nb-Al/Al2O3 technology (S: superconductor, I: insulator, N: normal metal). Series arrays of about 1000 SNS Josephson junctions were realized as lumped arrays for applications in the Josephson arbitrary waveform synthesizer (JAWS). We suggest a novel scheme for combining the higher voltages generated by the binary-divided arrays with the frequency spectral characteristics of the JAWS, in order to optimize the frequency spectrum of the generated ac voltages
Keywords :
aluminium; aluminium compounds; measurement standards; niobium; superconducting arrays; superconductor-normal-superconductor devices; voltage measurement; waveform generators; 10 V; Josephson arbitrary waveform synthesizers; Josephson series arrays; Nb-Al-Al2O3; Nb-Al/Al2O3 technology; SINIS Josephson junctions; SNS Josephson junctions; binary-divided series arrays; frequency spectral characteristics; frequency spectrum; programmable SINIS Josephson voltage standards; AC generators; Character generation; Frequency synthesizers; Insulation; Josephson junctions; Metal-insulator structures; Pulse generation; Pulse shaping methods; Superconducting devices; Voltage; Josephson Arbitrary Waveform Synthesizer (JAWS); SINIS and SNS Josephson junctions; programmable Josephson voltage standards;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2007.891077
