Performance of Digital SQUID with Sub-Flux Quantum Feedback Resolution Fabricated using 10 kA/cm 2 Nb Process

Digital superconducting quantum interference device (SQUID with Single Flux Quantum (SFQ) feedback operates as a Δ-type oversampling A/D converter. Magnetic flux resolution at Nyquist frequency can be improved by taking sub SFQ feedback resolution and large oversampling ratio. Using high critical cu...

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Bibliographic Details
Published in:Journal of physics. Conference series 2020-07, Vol.1590 (1), p.12038
Main Authors: Itagaki, Kohki, Oshima, Itta, Hasegawa, Yuichi, Matsunawa, Ryo, Naruse, Masato, Taino, Tohru, Myoren, Hiroaki
Format: Article
Language:English
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Summary:Digital superconducting quantum interference device (SQUID with Single Flux Quantum (SFQ) feedback operates as a Δ-type oversampling A/D converter. Magnetic flux resolution at Nyquist frequency can be improved by taking sub SFQ feedback resolution and large oversampling ratio. Using high critical current density Nb process for fabricating SFQ circuits, we expected more higher operation speed for the digital SQUID and resulting to higher magnetic flux resolutions. We expected a performance of the digital SQUID magnetometer fabricated using 10 kA/cm 2 Nb process based on CAD layout, with an up/down counter using T 2 FF cells and parallel SFQ feedback. For the clock frequency of 13 GHz and the Nyquist frequency of 1.587 MHz, the magnetic field noise was lower than 1.5 fT / Hz and the slew rate was exceeded 500 mT/s.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1590/1/012038