Bit-Serial Single Flux Quantum Microprocessor CORE

Fujimaki, Akira; Yamada, Takahiro; Yamanashi, Yuki; Park, Heejoung; Yoshikawa, Nobuyuki

doi:10.1093/ietele/e91-c.3.342

Cited by 90 publications

(32 citation statements)

References 16 publications

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“…Main circuits for these applications are microprocessors or accelerators. Several types of microprocessors based on RSFQ circuits have been demonstrated so far [24,25,26].…”

Section: Applications Of Rsfq Circuitsmentioning

confidence: 99%

Advancement of superconductor digital electronics

Fujimaki

2012

IEICE Electron. Express

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Advancement of superconductor digital electronics, especially Rapid Single Flux Quantum (RSFQ) logic circuit is described. Ultra short pulse of a voltage generated across a Josephson junction and release from charging/discharging process for signal transmission in RSFQ circuits enable us to reduce power consumption and gate delay. The power-delay products (PDPs) of RSFQ integrated circuits (ICs) are 4 or 5 orders of magnitude smaller than those of semiconductor ICs. The fabrication process technology and the related designing technology have been advanced, and RSFQ ICs have been applied to software-defined radio receivers, superconductor detector array systems, and supercomputers. Recently, several kinds of energy-efficient single flux quantum circuit have been proposed to obtain further advantage to semiconductor devices. The PDPs of these circuits become at least 1 order smaller than those of conventional RSFQ circuits. Keywords: single flux quantum, superconductor, energy efficiency, high-speed, power-delay product Classification: Superconducting electronics References

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“…Main circuits for these applications are microprocessors or accelerators. Several types of microprocessors based on RSFQ circuits have been demonstrated so far [24,25,26].…”

Section: Applications Of Rsfq Circuitsmentioning

confidence: 99%

Advancement of superconductor digital electronics

Fujimaki

2012

IEICE Electron. Express

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“…The issues of RSFQ processor and system design have been addressed in several projects: SPELL processors for the hybrid technology multi-threaded (HTMT) project, 5 ' 6 the 8-bit FLUX processor 7 ' 8 and 8-bit Frontier datapath 9 projects in the U.S., the bit-serial CORE processor 10 and LSRDP computer 11 projects in Japan. These projects are summarized in Table 1.…”

Section: Past and Present Rsfq Processor Design Projectsmentioning

confidence: 99%

Current Status and Recent Developments in RSFQ Processor Design

Luryi

Xu²,

Zaslavsky³

2010

Future Trends in Microelectronics

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“…Single-flux-quantum (SFQ) circuits [1] that can integrate over ten thousand of niobium-based Josephson junctions have been demonstrated at clock frequencies of tens of gigahertz with a power consumption of only a few milliwatts [2]. Owing to their high-speed and low-power operation, SFQ circuits could be a promising candidate as an alternative technology for semiconductor CMOS devices, even including the cooling cost.…”

Section: Introductionmentioning

confidence: 99%

Low-Energy Optical-to-Electrical Converters Based on Superconducting Nanowire for Single-Flux-Quantum Circuits

Kajino

Miki

Yamashita

et al. 2015

IEICE Trans. Electron.

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SUMMARYWe report the energy-efficient optical input interface using NbN superconducting nanowire-based optical-to-electrical (SN-OE) converters for a single-flux-quantum (SFQ) data processing system. The SN-OE converters with small active areas ranging from 1 × 1 to 10 × 10 µm 2 were fabricated to improve the recovery time by reducing the kinetic inductance of the nanowire. The SN-OE with the smallest area of 1 × 1 µm 2 showed the recovery time of around 0.3 ns, while its detection efficiency for a single photon was reduced below 0.1% due to insufficient coupling efficiency with a single-mode optical fiber. However, the optical power dependence of the error rate of this device showed that the required optical power to achieve the error rate below 10 −12 at 10 GHz operation is as large as 70 µW, which is still one order of magnitude lower than semiconductor photo diodes. We also demonstrated the operation of the SN-OE converters combined with the SFQ readout circuit and confirmed the operating speed up to 77 MHz.

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Bit-Serial Single Flux Quantum Microprocessor CORE

Cited by 90 publications

References 16 publications

Advancement of superconductor digital electronics

Advancement of superconductor digital electronics

Current Status and Recent Developments in RSFQ Processor Design

Low-Energy Optical-to-Electrical Converters Based on Superconducting Nanowire for Single-Flux-Quantum Circuits

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