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Optimization of a Josephson voltage array based on frequency dependently damped superconductor–insulator–superconductor junctions

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4 Author(s)
Hassel, J. ; VTT Information Technology, Microsensing, P.O. Box 1207, 02044 VTT, Finland ; Seppa, H. ; Gronberg, L. ; Suni, Ilkka

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We have developed a programmable Josephson voltage standard based on an array of superconductor–insulator–superconductor junctions. The junctions are damped by an external frequency-dependent shunt circuit, which allows operation at Shapiro steps with n≫1. We derive optimization criteria for the design parameters for a fast and stable array with low power consumption. An array able to generate 1.0 VRMS ac voltage signal with sub-ppm accuracy is experimentally demonstrated. Theoretically it is also shown that a fast programmable 10 V array can be realized. © 2003 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:74 ,  Issue: 7 )

Date of Publication:

Jul 2003

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