Title :
A Bias Source for Dynamic Voltage Measurements With a Programmable Josephson Junction Array
Author :
Malétras, François-Xavier ; Gournay, Pierre ; Robinson, Ian A. ; Genevès, Gérard
Author_Institution :
Nat. Phys. Lab., Teddington
fDate :
4/1/2007 12:00:00 AM
Abstract :
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
Keywords :
programmable circuits; superconducting arrays; superconducting junction devices; voltage measurement; Linux-based real-time controller; Watt-balance experiments; analog-to-digital converter; bias current source; dynamic voltage measurements; programmable Josephson junction array; Detectors; Electromagnetic measurements; Josephson junctions; Laboratories; Magnetic field measurement; Phase measurement; Superconducting coils; Superconducting devices; Velocity measurement; Voltage measurement; Bias current source; Josephson effect; Josephson junction array (JJA); Planck´s constant; Watt-balance experiment; kilogram; voltage measurements;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2007.891061
