Sp. Benz et al., OPERATING MARGINS FOR A PULSE-DRIVEN PROGRAMMABLE VOLTAGE STANDARD, IEEE transactions on applied superconductivity, 7(2), 1997, pp. 2653-2656
We have designed and fabricated a Josephson voltage standard where the
voltage can be rapidly and continuously programmed by changing the re
petition frequency of a pulse drive. Simulations are made to optimize
the operating margins of the circuit for different pulse waveforms. Th
e response of a 1000-junction array of Nb-PdAu-Nb junctions is measure
d, and constant-voltage step heights are characterized as a function o
f the pulse amplitude, pulse width, and frequency. A dc bias range of
0.62 mA is demonstrated over a continuous voltage-tunable range from -
6.2 mV to +6.5 mV.