AC Josephson voltage standard: Progress report

C.A. Hamilton

doi:10.1109/19.571818

AC Josephson voltage standard: Progress report

1997-04-01

41

OA

AI

DOI：10.1109/19.571818

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Progress toward a Josephson voltage standard for fast de measurements and accurate ac waveform synthesis is described, A superconductor-normal-superconductor (SNS) junction process is used to make 5 mA critical current arrays with up to 32 768 junctions, With rf excitation at 11 GHz these arrays generate milliampere constant-voltage steps, A bias control circuit that provides output current amplification, transient suppression, and submicrosecond settling time is used with both superconductor-insulator-superconductor (SIS) and SNS junction arrays for fast, automated measurements of A/D converter linearity, a test for subnanovolt accuracy, waveform synthesis, and a preliminary measurement of the ac-dc difference of a thermal voltage converter.

Keyword:

AC

digital-to-analog converter

Josephson

standard

voltage

waveform synthesis

AC Josephson voltage standard: Progress report

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