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Hybrid integration of a Josephson series array and a 10 GHz planar oscillator

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6 Author(s)
F. X. Hebrank ; Phys. Tech. Bundesanstalt, Braunschweig, Germany ; E. Vollmer ; T. Funck ; J. Kohlmann
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A computer-controlled Josephson voltage standard has been developed comprising the hybrid integration of a planar oscillator and a Josephson series array. A 10 GHz voltage controlled oscillator has been frequency-stabilized to a reference frequency by a phase-locked loop. A series array has been designed and fabricated in Nb/Al2O3/Nb technology. To obtain quantized voltage steps with a drive frequency of 10 GHz, the critical current density of the Junctions is reduced to below 2 A/cm2 by variation of the oxidation parameters. The hybrid integration of a Josephson circuit with a planar MESFET oscillator produced quantized voltage steps up to 980 mV with a step width of 2 μA

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IEEE Transactions on Instrumentation and Measurement  (Volume:46 ,  Issue: 2 )