Papers by Author: Shinichi Yorozu

Abstract: Internet traffic loads are increasing. Sustaining packet switching throughput of a core node will be difficult. A major reason for this is power consumption and packaging volume. As long as we use only current semiconductor technology, the switching capacity will be limited. Rapid single flux quantum (RSFQ) superconducting technology can overcome such difficulties because of high-speed operation and low-power consumption characteristics. A superconducting wiring also enables high-speed inter-chip communication. We report on progress on packet switch circuit implementation and cryo-cooled packaging for a RSFQ packet switch system. In addition, we discuss a possible packet switch architecture over 100 Tbps that uses RSFQ technology.

Abstract: We describe recent topics of rapid-single-flux-quantum (RSFQ) circuits. Much higher integration and higher-speed operation are required for commercializing the RSFQ circuits in any application. To satisfy this requirement, we measure several kinds of time fluctuations that possibly limit the integration level and operating speed, and introduce the flexible passive transmission line technology including a multicasting transmitter. In addition, we describe our ongoing applications. A multiple-detectors-system is expected to open a new application field of an RSFQ-based analog-to-digital converter and a digital signal processor. As for a microprocessor application, increased number of arithmetic logic units may be effective for enhancing the computing performances.