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New microwave circuits for programmable voltage standards using high-temperature Josephson junction arrays

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7 Author(s)
Klushin, A.M. ; Inst. fur Schicht- und Ionentech., Forschungszentrum Julich GmbH, Germany ; Weber, C. ; Kohlstedt, H. ; Starodubrovskii, R.K.
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New microwave circuits for voltage standard application containing 256 shunted bicrystal junctions were designed and investigated. The series array follows a meander line, which prevents the uniform distribution of microwave current along the array. To overcome this drawback, we are placing the meander parallel to a coplanar waveguide line. This provides parallel feeding of microwave power to series connected junctions. A circuit divided in 8 sub-arrays represents a seven-bit digital-to-analog converter. At a frequency f=27332 MHz and for a constant power each of the segments of the array demonstrated the first current step at 78 K.

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Applied Superconductivity, IEEE Transactions on  (Volume:9 ,  Issue: 2 )