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All-NbN Digital-to-Analog Converters for a Programmable Voltage Standard



Hirotake Yamamori, M. Itoh, H. Sasaki, A. Shoji, Samuel Benz, Paul Dresselhaus


Five-bit all-NbN digital-to-analog converters (DACs) for a programmable voltage standard have been fabricated using NbN/TiNx/NbN Josephson junctions and their operation has been demonstrated. The DAC consists of six arrays of 128, 128, 256, 512, 1024 and 2048 junctions per array. We have measured the current-voltage characteristics for the junction arrays driven with a 16 GHz microwave signal at 4.2 and 10 K, resulting in constant-voltage steps with heights larger than 2 mA. The maximum output voltage for the DAC was 136 mV, indicating that all 4096 junctions in the DAC yielded a voltage corresponding to the microwave frequency through the ac Josephson effect.
Superconductor Science and Technology


Superconductor, Josephson junction, Digital-to-analog converter


Yamamori, H. , Itoh, M. , Sasaki, H. , Shoji, A. , Benz, S. and Dresselhaus, P. (2001), All-NbN Digital-to-Analog Converters for a Programmable Voltage Standard, Superconductor Science and Technology, [online], (Accessed July 18, 2024)


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Created November 20, 2001, Updated October 12, 2021