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Dual Josephson impedance bridge: towards a universal bridge for impedance metrology

Published

Author(s)

Frederic Overney, Nathan E. Flowers-Jacobs, Blaise Jeanneret, Alain Rufenacht, Anna E. Fox, Paul D. Dresselhaus, Samuel P. Benz

Abstract

This paper presents a full characterization of a Dual Josephson Impedance Bridge (DJIB) at frequencies up to 80 kHz by using the DJIB to compare the best available impedance standards that are (a) directly traceable to the quantum Hall effect, (b) used as part of international impedance comparisons, or (c) believed to have calculable frequency dependence. The heart of the system is a dual Josephson Arbitrary Waveform Synthesizer (JAWS) source that offers unprecedented flexibility in high-precision impedance measurements. The JAWS sources allow a single bridge to compare impedances with arbitrary ratios and phase angles in the complex plane. The uncertainty budget shows that both the traditional METAS bridges and the DJIB have comparable uncertainties in the kilohertz range. This shows that the advantages of the DJIB, including the flexibility which allows the comparison of arbitrary impedances, the wide frequency range and the automated balancing procedure, are obtained without compromising the measurement uncertainties. These results demonstrate that this type of instrument can considerably simplify the realization and maintenance of the various impedance scales. In addition, the DJIB is a very sensitive tool for investigating the frequency-dependent systematic-errors that can occur in impedance construction and in the voltage provided by the JAWS source at frequencies greater than 10 kHz.
Citation
Metrologia
Volume
57
Issue
065014

Keywords

Dual Josephson Impedance Bridge, DJIB, quantum Hall effect, international impedance comparisons, calculable frequency dependence, Josephson Arbitrary Waveform Synthesizer, JAWS, high-precision impedance measurements, single bridge, arbitrary ratios, phase angles, complex plane, METAS bridges, frequency-dependent systematic-errors

Citation

Overney, F. , Flowers-Jacobs, N. , Jeanneret, B. , Rufenacht, A. , Fox, A. , Dresselhaus, P. and Benz, S. (2020), Dual Josephson impedance bridge: towards a universal bridge for impedance metrology, Metrologia, [online], https://doi.org/10.1088/1681-7575/ab948d (Accessed April 21, 2021)
Created October 21, 2020, Updated January 12, 2021