A prototype Josephson quantum standard for synthesizing sine waves characterised by low-level harmonics and high accuracy was developed, opening up new possibilities for metrological support in the area of ac voltage. The standard includes a cryogenic probe with Josephson chips, a delta-sigma modulator, a pulse pattern generator, a compensation circuit, a spectrum analyzer, a video control unit, as well as special software. A capability of sine wave synthesis with an output voltage up to 130 mV RMS over a wide frequency range from 1 kHz to 100 kHz is demonstrated. Higher harmonics are suppressed below the noise floor up to 100 dBc.
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Translated from Izmeritel’naya Tekhnika, No. 4, pp. 39–43, April, 2020.
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Katkov, A.S., Lovtsyus, V.E., Bykov, A.I. et al. Electrical Quantum Metrology Standard for the Synthesis of Ac Voltages. Meas Tech 63, 295–300 (2020). https://doi.org/10.1007/s11018-020-01786-0
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DOI: https://doi.org/10.1007/s11018-020-01786-0