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10 V Programmable Josephson voltage standard circuits using NbN/TiNx/NbN/TiNx/NbN double-junction stacks

Published

Author(s)

Hirotake Yamamori, Mayumi Ishizaki, A. Shoji, Paul Dresselhaus, Samuel Benz

Abstract

Using NbN/TiNx/NbN/TiNx/NbN double-junction stack technology we have demonstrated programmable Josephson voltage standard chips that operate up to 10.16 V output voltage cooled with a two-stage Gifford-McMahon cryocooler. The circuit uses double-stacked junctions, where two junctions are fabricated in each stack, in order to integrate 327680 junctions into a 15.3 mm x 15.3 mm chip. A 1-to-32 microwave distribution circuit is also integrated on the chip. The array circuit is divided into 22 cells, which perform as an 11-bit digital-to-analog converter (DAC). The 21 working cells include 307200 junctions biased with 16-GHz microwaves at 10.2 K generated flat steps with current margins greater than 1 mA, which indicates good uniformity of the stacked junctions.
Citation
Applied Physics Letters
Volume
88
Issue
042503-1

Keywords

cryocooler, Josephson voltage standard, stacked junction

Citation

Yamamori, H. , Ishizaki, M. , Shoji, A. , Dresselhaus, P. and Benz, S. (2006), 10 V Programmable Josephson voltage standard circuits using NbN/TiNx/NbN/TiNx/NbN double-junction stacks, Applied Physics Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=32119 (Accessed July 14, 2024)

Issues

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Created January 23, 2006, Updated October 12, 2021