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Activities of the FLUXONICS Society

Friedrich Uhlmann

Published Jan 22, 2015• 0 citations
OpenAlex

Abstract

Abstract – We offer a brief overview of activities of the FLUXONICS Society, from its inception to the present status. Its overall goal is to stimulate the development of digital superconducting electronics in Europe. Its main activities are: (1) professional education through RSFQ Workshops, (2) development and maintenance of RSFQ cell library, (3) technical forecasting via a roadmap, and (4) linkage of and to European centers for superconducting low-temperature electronics, and the operation of FLUXONICS Foundry.

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Abstract – We offer a brief overview of activities of the FLUXONICS Society, from its inception to the present status. Its overall goal is to stimulate the development of digital superconducting electronics in Europe. Its main activities are: (1) professional education through RSFQ Workshops, (2) development and maintenance of RSFQ cell library, (3) technical forecasting via a roadmap, and (4) linkage of and to European centers for superconducting low-temperature electronics, and the operation of FLUXONICS Foundry.
Superconductivity and superconducting electronics have quite a prominent place in the European research environment and can look back onto a successful history. In recent years the European Framework programs helped to enhance the interaction between the different national research institutions, universities and industry. For applications of superconductivity this was accomplished by the European Network of Excellence SCENET and its sister organization ESAS. In this context a virtual European foundry network was established (Fluxonics), which forms a platform for the superconducting electronics activities in Europe and realizes support for the design and the fabrication of superconducting circuits for research laboratories and industry. Lately quite some development on the digital side and the cooling of superconducting electronics devices has taken place in Europe; most of it within the Fluxonics network. Some of these advances will be reported in this overview article.
The integration of superconductor digital electronics together with superconducting sensors can enable smart multi-channel sensor arrays. Applications of such sensors range from basic astrophysical research to advanced security screening devices. The main advantage of superconducting sensor interfaces is the very low power consumption in combination with a very low noise level; both are required in order to keep the excellent superconducting sensor performance without distortions. The FLUXONICS Foundry technology has been optimized with respect to electronic interfaces circuits for analogue sensor readout and signal multiplexing. In this work, we describe this new interface technology and present a comparison with our standard RSFQ technology.
The paper provides an overview of the design and fabrication process of Rapid Single Flux Quantum (RSFQ) circuits [1] and a demonstration of the established integrated framework of the FLUXONICS Foundry [2].Test circuits demonstrate the integration of functional elements into more complex devices.The circuits were extensively tested, including an on-chip 30 GHz test using a ladder-type clock generator, as well as by bit error rate measurements.The results presented here show the potentials and the reliability of the European FLUXONICS Foundry for the design and fabrication of robust RSFQ circuits for end-users in research and industry.
Superconducting Rapid Single Flux Quantum (RSFQ) circuits have the ability to perform digital operation with clock signals in the microwave frequency range. The clock signal can be either generated on-chip via Josephson oscillators, or injected externally through microwave lines. We have investigated several configurations to digitize and process on-chip microwave signals for space-based applications, based on the European FLUXONICS Foundry with a niobium-based technology that can opearate at clock frequencies in the 30-40 GHz range. This presentation will focus on the main features of the technology, the expected performances for specific applications and the current status of experimental results of several circuits measured at 4K. It will also feature prospects and expectations, based on circuits already designed and in preparation.
ENGLISH ABSTRACT: Rapid Single Flux Quantum (RSFQ) cells are key in the design of complex and applicable RSFQ electronic circuits. These cells are low-level circuit elements that are used repeatedly to build larger, applicable RSFQ circuitry. Making these cells simple to layout and manufacture, but reliable for extensive use demands a careful development process for RSFQ cells. Cell functionality is verified through simulations, thereafter the cell is laid out in special software packages. Inductance of on-chip superconductor structures is extracted through careful modelling with numerical field solver software. A cell library has been developed by incorporating existing or published cells after further analysis and optimization, as well as developing new cells. Cells that have been adapted into the library include the Josephson transmission line (JTL), Splitter, Merger, D-Flip Flop (DFF), T-Flip Flop (TFF), NOT, AND, OR and XOR, DC-SFQ and SFQ-DC and PTL Driver and Receivers. New cells include NOR, NAND and XNOR. The cells were designed for the IPHT’s RSFQ1D 1kA/cmª and Hypres’ 4.5kA/cmª processes. The cells in the library have good bias current operating margins obtained through simulations (> ±26%). All cells have all the parameters listed in the thesis including extracted inductance values. In order to have a complete and verified RSFQ cell library, cells have been sent for fabrication at IPHT and Hypres facilities. These cells can now be tested on-chip, in the laboratory, to establish functionality and practical bias current margins. All test signal patterns and bias currents required for testing are defined to allow co-workers or collaborators to test the cells.
In recent years, the development of superconducting digital electronics has been making rapid progress. A variety of digital circuits based on Single-Flux Quantum (SFQ) device technology such as high-speed switching circuits for router systems and high-speed sampling oscilloscope systems have been demonstrated. These achievements have been mainly based on the NEDO project, “Development of Low-power Superconducting Network Devices”. This paper describes these recent progress and future prospects of superconducting digital electronics.