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

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5 Author(s)
Yamamori, H. ; National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba 305-8568, Japan ; Ishizaki, M. ; Shoji, A. ; Dresselhaus, P.D.
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Using NbN/TiNx/NbN/TiNx/NbN double-junction stack technology we have demonstrated a programmable Josephson voltage standard chip that operates up to 10.16 V output voltage cooled with a two-stage Gifford–McMahon cryocooler. The circuit uses double-junction stacks, where two junctions are fabricated in each stack, in order to integrate 327 680 junctions into a 15.3 mm×15.3 mm chip. A 1-to-32 microwave distribution circuit is also integrated on the chip. The chip is divided into 22 cells, which perform as an 11-bit digital-to-analog converter. The 21 working cells include 307 200 junctions biased with 16 GHz microwaves at 10.2 K that generated flat voltage steps with current margins greater than 1 mA, which indicates good uniformity of the stacked junctions.

Published in:

Applied Physics Letters  (Volume:88 ,  Issue: 4 )

Date of Publication:

Jan 2006

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