Investigations on extending the frequency range of PJVS based AC voltage calibrations by coherent subsampling

Ihlenfeld, W. G. Kurten; Landim, Regis Pinheiro

doi:10.1109/cpem.2016.7539732

Cited by 11 publications

(7 citation statements)

References 2 publications

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“…One approach to increase this maximum frequency is to use the sub-sampling technique [12], described in the following section.…”

Section: The Ac-qvmmentioning

confidence: 99%

“…As the frequency limit of the differential sampling technique is set by the combination of the transients of the PJVS, the maximum frequency of the PJVS waveform and the limitations of the sampler (bandwidth, input filter, slew rate, etc), * Author to whom any correspondence should be addressed. a new coherent sub-sampling method has been proposed [12] to extend the frequency range for quantum-based sampling into the 100 kHz range. A frequency range extension of the ac-QVM up to 100 kHz and beyond would be beneficial for many ac calibrations and could provide an independent method for investigating pulse-driven Josephson systems at high frequencies with sub-μV V −1 uncertainties [13].…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we present the first promising results of an ac-QVM for frequencies up to 100 kHz. Such an increase of measurement bandwidth is possible due to a new coherent subsampling technique [12,14] which has been developed further. Only minor modifications must be applied to the hardware of existing quantum voltmeters which are explained in section 2.…”

Section: Introductionmentioning

confidence: 99%

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An AC quantum voltmeter for frequencies up to 100 kHz using sub-sampling

Behr

Palafox

2021

Metrologia

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Differential sampling relative to a Josephson waveform, the ac quantum voltmeter (ac-QVM), has been established as the most accurate method for measuring signals below 1 kHz with an uncertainty of 1 part in 108 (k = 1) for 1 V at 250 Hz. Commercial ac-QVMs provide accuracies of about 1 part in 106 up to frequencies of 2 kHz. Here we present a new sub-sampling technique to extend the frequency range of an ac-QVM up to 100 kHz. The measurement results at 1 V RMS amplitude agree well within 5 µV V−1 (k = 1) with the nominal voltage values for all frequencies from 500 Hz to 100 kHz. Two different analogue-to-digital converters are compared, sampling techniques, error sources and corrections as well as detailed uncertainty estimations are discussed.

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“…One approach to increase this maximum frequency is to use the sub-sampling technique [12], described in the following section.…”

Section: The Ac-qvmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An AC quantum voltmeter for frequencies up to 100 kHz using sub-sampling

Behr

Palafox

2021

Metrologia

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“…Although a solution to this limitation was found with the sampling technique, the upper operating frequency is limited to a few kilohertz. However, some interesting advancements are still possible [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Non-Conventional PJVS Exploiting First and Second Steps to Reduce Junctions and Bias Lines

Durandetto

Sosso

2020

IEEE Trans. Instrum. Meas.

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Quantum Digital-to-Analog Converters (DACs) based on programmable Josephson array (PJVS) represent the most widely used quantum standard in ac voltage calibrations. The extension of PJVS frequency above the kHz range appears to be arduous, yet some enhancement are still practicable. In this work we demonstrate the possibility to advantageously operate a conventional binary-divided PJVS array with a reduced number of bias lines. This feature is achieved by exploiting both first and second Shapiro steps along with non-conventional DAC codings. Two newly devised bias techniques are described in detail and preliminary experimental tests on waveform synthesis have been carried out and are presented here.

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“…Figure15(b) depicts the sub-sampling scheme following the idea of (Kürten Ihlenfeld andLandim 2016). During time intervals shown as grey zones, the voltage difference between the sine wave under test and Josephson voltage steps of a PJVS are sampled.…”

mentioning

confidence: 99%

Josephson voltage standards as toolkit for precision metrological applications at PTB

Behr

Bauer

Herick

et al. 2022

Meas. Sci. Technol.

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60 years after the discovery of the Josephson effect, electrical DC voltage calibrations are routinely performed worldwide - mostly using automated Josephson voltage standards (JVS). Nevertheless, the field of electrical quantum voltage metrology is still propagating towards AC applications. In the past 10 years the fabrication of highly integrated arrays containing more than 50 000 or even 300 000 junctions has achieved a very robust level providing highly functional devices. Such reliable Josephson arrays are the basis for many novel applications mainly focussing on precision ac measurements for signal frequencies up to 500 kHz. Two versions of quantum AC standards are being employed. Programmable Josephson voltage standards (PJVS), based on series arrays divided into subarrays, reach amplitudes up to 20 V and usually are used as quantum voltage reference in measurement systems. Pulse driven arrays reach amplitudes up to 1 V or even 4 V and are typically used as Josephson arbitrary waveform synthesizers (JAWS). This paper summarizes the principal contributions from PTB to the present state of Josephson voltage standards with particular focus on developments for precision metrological applications and our proof-of-concept demonstrations.

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Investigations on extending the frequency range of PJVS based AC voltage calibrations by coherent subsampling

Cited by 11 publications

References 2 publications

An AC quantum voltmeter for frequencies up to 100 kHz using sub-sampling

An AC quantum voltmeter for frequencies up to 100 kHz using sub-sampling

Non-Conventional PJVS Exploiting First and Second Steps to Reduce Junctions and Bias Lines

Josephson voltage standards as toolkit for precision metrological applications at PTB

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