A Bias Source for Dynamic Voltage Measurements With a Programmable Josephson Junction Array

In this paper, the design and test of a compact bias current source for binary-weighted programmable Josephson junction arrays (PJJA) is reported. The new source, driven by a Linux-based real-time controller, enables continuous PJJA updates at a rate greater than 10 kHz. Fast and accurate voltage me...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2007-04, Vol.56 (2), p.495-499
Main Authors: Maletras, F.-X., Gournay, P., Robinson, I.A., Geneves, G.
Format: Article
Language:English
Subjects:
Arrays
Bias
Bias current source
Coiling
Detectors
Dynamics
Electrical measurements
Electromagnetic measurements
Instrumentation
Josephson effect
Josephson junction array (JJA)
Josephson junctions
kilogram
Laboratories
Magnetic field measurement
Phase measurement
Planck's constant
Superconducting coils
Superconducting devices
Velocity measurement
Voltage
Voltage measurement
voltage measurements
Watt-balance experiment
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Summary:In this paper, the design and test of a compact bias current source for binary-weighted programmable Josephson junction arrays (PJJA) is reported. The new source, driven by a Linux-based real-time controller, enables continuous PJJA updates at a rate greater than 10 kHz. Fast and accurate voltage measurements by null detection against the PJJA are possible, owing to an onboard analog-to-digital converter (ADC). The new source is used in Watt-balance experiments at the Laboratoire National de Metrologie et d'Essais (LNE) and the National Physical Laboratory (NPL) to perform dynamic measurement of the coil voltage during the dynamic phase
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2007.891061