Experimental Investigation of ERSFQ Circuit for Parallel Multibit Data Transmission

Filippov, T.V.; Amparo, Denis; Kamkar, Michael Y.; Walter, Jason; Kirichenko, A.F.; Mukhanov, Oleg A.; Vernik, Igor V.

doi:10.1109/isec.2017.8314191

Cited by 10 publications

(5 citation statements)

References 13 publications

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“…The complexity of superconducting circuits becomes limited to 2.5 million junctions per square centimeter under the assumption that only a quarter of the chip area can be occupied by Josephson junctions (with taking interconnects into account) [ 19 ]. The circuits can be further expanded using multi-chip module (MCM) technology [ 21 – 22 ].…”

Section: Reviewmentioning

confidence: 99%

Beyond Moore’s technologies: operation principles of a superconductor alternative

Soloviev

Klenov

Bakurskiy

et al. 2017

Beilstein J. Nanotechnol.

171

103

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The predictions of Moore’s law are considered by experts to be valid until 2020 giving rise to “post-Moore’s” technologies afterwards. Energy efficiency is one of the major challenges in high-performance computing that should be answered. Superconductor digital technology is a promising post-Moore’s alternative for the development of supercomputers. In this paper, we consider operation principles of an energy-efficient superconductor logic and memory circuits with a short retrospective review of their evolution. We analyze their shortcomings in respect to computer circuits design. Possible ways of further research are outlined.

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Section: Reviewmentioning

confidence: 99%

Beyond Moore’s technologies: operation principles of a superconductor alternative

Soloviev

Klenov

Bakurskiy

et al. 2017

Beilstein J. Nanotechnol.

171

103

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“…where γ is the PTL propagation constant and Z 0 is the PTL characteristic impedance. Converting this into a scattering matrix [50] and also leads to equation (3).…”

mentioning

confidence: 99%

Propagation of picosecond pulses on superconducting transmission line interconnects ^*

Talanov¹,

Knee²,

Harms³

et al. 2022

Supercond. Sci. Technol.

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Interconnects are a major discriminator for superconducting digital technology, enabling energy efficient data transfer and high-bandwidth heterogeneous integration. We report a method to simulate propagation of picosecond pulses in superconducting passive transmission lines (PTLs). A frequency-domain propagator model obtained from the Ansys High Frequency Structure Simulator (HFSS) field solver is incorporated in a Cadence Spectre circuit model, so that the particular PTL geometry can be simulated in the time-domain. The Mattis-Bardeen complex conductivity of the superconductor is encoded in the HFSS field solver as a complex-conductivity insulator. Experimental and simulation results show that Nb 20 Ω microstrip PTLs with 200 nm interlayer dielectric thickness can support propagation of a single-flux-quantum pulse up to 7 mm and a double- flux-quantum pulse up to 28 mm.

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“…The combination of low power logic [2] and low loss interconnects (e.g. [3] and references thereof) shifts the design trade-off toward heterogeneous distributed architectures with multiple chips on multiple boards. Volumetric cooling with efficient of 35 GHz and 0.58 fJ per bit has been reported in [5].…”

mentioning

confidence: 99%

Isochronous data link across a superconducting Nb flex cable with 5 femtojoules per bit^*

Dai¹,

Kegerreis²,

Gamage³

et al. 2022

Supercond. Sci. Technol.

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Interconnect properties position superconducting digital circuits to build large, high performance, power efficient digital systems. We report a board-to-board communication data link, which is a critical technological component that has not yet been addressed. Synchronous communication on chip and between chips mounted on a common board is enabled by the superconducting resonant clock/power network for Reciprocal Quantum Logic circuits. The data link is extended to board-to-board communication using isochronous communication, where there is a common frequency between boards but the relative phase is unknown. Our link uses over-sampling and configurable delay at the receiver to synchronize to the local clock phase. A single-bit isochronous data link has been demonstrated on- chip through a transmission line, and on a multi-chip module through a superconducting tape between driver and receiver with variable phase offset. Measured results demonstrated correct functionality with a clock margin of 3 dB at 3.6 GHz, and with 5 fJ/bit at 4.2 K.

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Experimental Investigation of ERSFQ Circuit for Parallel Multibit Data Transmission

Cited by 10 publications

References 13 publications

Beyond Moore’s technologies: operation principles of a superconductor alternative

Beyond Moore’s technologies: operation principles of a superconductor alternative

Propagation of picosecond pulses on superconducting transmission line interconnects ^*

Isochronous data link across a superconducting Nb flex cable with 5 femtojoules per bit^*

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Experimental Investigation of ERSFQ Circuit for Parallel Multibit Data Transmission

Cited by 10 publications

References 13 publications

Beyond Moore’s technologies: operation principles of a superconductor alternative

Beyond Moore’s technologies: operation principles of a superconductor alternative

Propagation of picosecond pulses on superconducting transmission line interconnects *

Isochronous data link across a superconducting Nb flex cable with 5 femtojoules per bit*

Contact Info

Product

Resources

About

Propagation of picosecond pulses on superconducting transmission line interconnects ^*

Isochronous data link across a superconducting Nb flex cable with 5 femtojoules per bit^*