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Progress Toward a 1 V Pulse-Driven AC Josephson Voltage Standard

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6 Author(s)
Benz, S.P. ; Nat. Inst. of Stand. & Technol., Boulder, CO ; Dresselhaus, P.D. ; Rufenacht, A. ; Bergren, N.F.
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We present a new record root mean square (rms) output voltage of 275 mV, which is a 25% improvement over the maximum that is achieved with previous AC Josephson voltage standard (ACJVS) circuits. We demonstrate the operating margins for these circuits and use them to measure the harmonic distortion of a commercial digitizer. Having exceeded the threshold of 125 mV rms for a single array of Josephson junctions, we propose and discuss the features of an eight-array circuit that is capable of achieving 1 V rms. We investigate the use of a resistive divider to extend the ACJVS voltage accuracy to higher voltages. By the use of a switched-input measurement technique, an integrating sampling digital voltmeter, a resistive voltage divider, and ACJVS synthesized sine waves as reference voltages, we characterize the stability of a commercial calibration source for a few voltages up to 2.7 V.

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:58 ,  Issue: 4 )

Date of Publication:

April 2009

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