Rapid single flux quantum digital-to-analog converter for ac voltage standard

Maezawa, M.; Hirayama, Fuminori; Suzuki, Motohiro

doi:10.1016/j.physc.2005.02.130

Cited by 26 publications

(16 citation statements)

References 17 publications

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“…On the other hand, quantum voltage generation based on the Josephson effects is the crucial advantage of Josephson DACs for metrology, i.e. AC voltage standards [3–6].…”

Section: Introductionmentioning

confidence: 99%

9 bit superconductive single‐flux‐quantum digital‐to‐analogue converter

et al. 2014

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The design and operation of a 9 bit superconductive single-fluxquantum (SFQ) digital-to-analogue converter (DAC) are presented. The DAC comprises a 9 bit variable SFQ pulse number multiplier and a 100-fold voltage multiplier. An SFQ pulse-frequency modulation technique is employed for coding the analogue output voltage. The DAC is fabricated using an Nb Josephson integration technology. Its output voltage waveform, the amplitude of which is up to 2.54 mV pp , is controlled by digital input signals from a room-temperature data generator.Introduction: For the past few decades, superconductive Josephson digital-to-analogue converters (DACs) have been developed for radiofrequency (RF) transmit applications and for metrological applications. High conversion rates are important performance indices in RF signal processing [1,2]. On the other hand, quantum voltage generation based on the Josephson effects is the crucial advantage of Josephson DACs for metrology, i.e. AC voltage standards [3-6].Among the several types of Josephson DACs proposed for metrological applications, single-flux-quantum (SFQ)-based DACs are expected to synthesise AC voltage waveforms of high frequencies beyond 1 MHz, because of their ultra-fast digital signal processing [7,8]. Recently, we have demonstrated several voltage waveform generators comprising a DAC of the SFQ pulse-frequency modulation (PFM) type [9][10][11]. Their resolutions and voltage amplitudes were limited to 6 bits and 0.25 mV pp , respectively, whereas they were designed to generate specific (not arbitrary) voltage waveforms.Following our previous results, we have tried to extend the resolution and voltage amplitude of an SFQ-PFM DAC itself by up to 9 bits and 2.5 mV pp , the design and operation of which are described in this Letter. The circuits were fabricated using an Nb/AlO x /Nb integration technology. The operation was tested in a liquid helium bath (4.2 K).

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“…On the other hand, quantum voltage generation based on the Josephson effects is the crucial advantage of Josephson DACs for metrology, i.e. AC voltage standards [3–6].…”

Section: Introductionmentioning

confidence: 99%

9 bit superconductive single‐flux‐quantum digital‐to‐analogue converter

et al. 2014

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“…Rapid single-flux-quantum (RSFQ) logic has been developed as a next-generation circuit technology because of its high speed and low power consumption [1]. Besides digital signal processing, highprecision voltage generation based on the Josephson effect is a unique application of RSFQ circuitry for the realization of AC voltage standards [2]- [5]. Among several types of RSFQ-DACs, we have developed circuit configurations of single-flux-quantum (SFQ) pulse-frequency modulation (PFM) [6].…”

Section: Introductionmentioning

confidence: 99%

Operation of a 4-bit RSFQ digital-to-analog converter based on a binary split-confluence configuration

Sega

Somei

Shimada

et al. 2022

J. Phys.: Conf. Ser.

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One of the unique applications of single-flux-quantum (SFQ) circuitry is a digital-to-analog converter (DAC) of which the output voltage is defined by the Josephson effect. Recently, we have designed and operated rapid single-flux-quantum (RSFQ) DACs with frequency modulation of SFQ pulse sequences. In this paper, we report our design and test results of a 4-bit RSFQ-DAC based on the configuration of the “sum of selected bits sequence (Σ-SBS)”. By adjusting the timing margins, in addition to the fabrication using the Nb integration process with the critical current density as high as 10 kA/cm2, the maximum output voltage up to 260 μV was demonstrated.

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“…Since the first proposal by Hamilton [1], several research groups have developed SFQ-based digital-to-analog converters (DACs) for metrological applications, e.g., AC voltage standards [2,3,4]. Recently, we demonstrated a 9-bit SFQ-DAC in which an SFQ pulse-frequency modulation (PFM) technique was employed [5].…”

Section: Introductionmentioning

confidence: 99%

Superconducting bipolar digital-to-analog converter equipped with dual double-flux-quantum amplifier

Mizugaki

Watanabe

Shimada

2016

IEICE Electron. Express

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Precise voltage generation is a unique feature of superconducting single-flux-quantum (SFQ) circuits, and hence, several SFQ-based digital-toanalog converters (DACs) have been designed for metrological applications. In this letter, we propose a dual double-flux-quantum amplifier (dual-DFQA) that extends DAC output voltage from unipolar to bipolar. An SFQ-based DAC comprising a 4-bit variable pulse number multiplier and a ²20-fold dual-DFQA is fabricated using a niobium integration technology. A 1-kHz, ²0.29-mV sinusoidal voltage waveform is successfully synthesized.

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Rapid single flux quantum digital-to-analog converter for ac voltage standard

Cited by 26 publications

References 17 publications

9 bit superconductive single‐flux‐quantum digital‐to‐analogue converter

9 bit superconductive single‐flux‐quantum digital‐to‐analogue converter

Operation of a 4-bit RSFQ digital-to-analog converter based on a binary split-confluence configuration

Superconducting bipolar digital-to-analog converter equipped with dual double-flux-quantum amplifier

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