Logic operation at 5 gb/s of an output interface for single-flux-quantum systems

Harada, Naoki; Yoshikawa, Nobuyuki; Yoda, K.; Yoshida, Akira; Yokoyama, Naoki

doi:10.1109/tasc.2003.816901

Cited by 2 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have developed a two-stage signal amplification scheme. In the first stage, an output signal is first amplified to several milivolts by using a superconducting digital voltage driver, which is based on Josephson junction latching type driver [8]. It is then amplified again to several hundred milivolts by using a semiconductor amplifier operating in the 40 K stage.…”

Section: B Packet-switching Subsystem Packagingmentioning

confidence: 99%

Progress of Single Flux Quantum Packet Switch Technology

Yorozu

Kameda

Hashimoto

et al. 2005

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

With regard to sustaining future capacity of network traffic, the current hardware technology has a big bottleneck in terms of power consumption and insufficient operation speed. To overcome this bottleneck, we have developed a single flux quantum (SFQ) packet-switching circuit. We report recent progress in developing the SFQ packet-switching application. First, we demonstrate a 40 GHz, 160 Gb/s, 4 4 packet switching circuit, which is currently the fastest clock frequency reported packet switch. Then, we describe a currently possible switching module using SFQ technology. Finally, we consider how SFQ technology can be used to scale the packet-switching capacity up to 100 Tbps.Index Terms-Multichip module, packet switching, single flux quantum circuit.

show abstract

Section: B Packet-switching Subsystem Packagingmentioning

confidence: 99%

Progress of Single Flux Quantum Packet Switch Technology

Yorozu

Kameda

Hashimoto

et al. 2005

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The low-temperature superconductor (LTS) latching driver based on the Nb junction showed 10-Gb/s operation. This operation speed was limited by the punchthrough probability which was caused by the small critical current density of 2.5 kA/cm [12]. A well-known way of reducing the punchthrough probability is increasing of the junction.…”

Section: Introductionmentioning

confidence: 99%

Output Interface With Latching Driver for LTS-SFQ Circuits

Hato

Horibe

Wakana

et al. 2005

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

We propose an output interface with a latching driver for single-flux-quantum (SFQ) circuits operating at 4.2 K. An optimum critical current density of the latching driver was discussed, and a multichip module (MCM) structure with SFQ circuits and latching drivers was proposed for 40-Gb/s operation. To optimize of the latching driver, we calculated the punchthrough probability of Nb-Al-AlO -Nb junctions and high-temperature superconductor (HTS) junctions. The Nb junction with a of 45 kA/cm 2 , which has a hysteresis of 44% for the latching operation, leads to a punchthrough probability lower than 10 15 for an ideal ac-bias of 40 GHz. On the other hand, ramp-edge-type interface-modified junctions based on YBa 2 Cu 3 O 7 have an optimum of 60 kA/cm 2 that gives the smallest punchthrough probability lower than 10 15 for an ideal ac-bias of 40 GHz without any shunt capacitance. Because the optimum of 45 kA/cm 2 for the latching driver is too large to fabricate large-scale integrated SFQ circuits with the Nb junction, the MCM structure consisting of SFQ circuits and latching drivers with the optimum is important to prepare 40-Gb/s SFQ systems. The of 60 kA/cm 2 is a practical value for the HTS junctions, and use of the low-temperature superconductor (LTS)-HTS MCM structure is also one way to realize the high-speed SFQ systems.Index Terms-Interface circuit, latching driver, multichip module (MCM), punchthrough, single-flux quantum (SFQ).

show abstract

Logic operation at 5 gb/s of an output interface for single-flux-quantum systems

Cited by 2 publications

References 4 publications

Progress of Single Flux Quantum Packet Switch Technology

Progress of Single Flux Quantum Packet Switch Technology

Output Interface With Latching Driver for LTS-SFQ Circuits

Contact Info

Product

Resources

About