Programmable Josephson Arrays for Impedance Measurements

Arbitrary impedance ratios can be determined with high accuracy by means of a programmable Josephson system. For a 1 : 1 resistance ratio at 10-kΩ level, we demonstrate that the novel system allows measurements over a wide frequency range from 25 Hz to 6 kHz. Uncertainties are in the range of a few...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2011-07, Vol.60 (7), p.2596-2601
Main Authors: Jinni Lee, Schurr, Jürgen, Nissila, Jaani, Palafox, Luis, Behr, Ralf, Kibble, Bryan P
Format: Article
Language:English
Subjects:
Arrays
Bridge circuits
Circuits
Electrical resistance measurement
Error analysis
Frequency measurement
Frequency ranges
Impedance
Impedance bridge
Impedance bridges
Impedance measurement
Instrumentation
Josephson array
Resistors
signal synthesis
Studies
Uncertainty
Voltage measurement
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Summary:Arbitrary impedance ratios can be determined with high accuracy by means of a programmable Josephson system. For a 1 : 1 resistance ratio at 10-kΩ level, we demonstrate that the novel system allows measurements over a wide frequency range from 25 Hz to 6 kHz. Uncertainties are in the range of a few parts in 10 8 and thus comparable to those of conventional impedance bridges. Two methods for four-terminal-pair impedance measurements have been investigated, i.e., the potential comparison circuit and the coaxial setup. Both methods are capable of measuring from dc to 6 kHz with uncertainties to a few parts in 10 8 . The potential comparison circuit has an upper bound at 6 kHz due to the use of the sampling method. The four-terminal-pair coaxial setup has the potential to decrease the relative uncertainty down to 10 -9 once systematic errors are analyzed and canceled.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2011.2117311