Ballistic SFQ signal propagation on-chip and chip-to-chip

作者：Quentin Herr, M. S. Wire, Andrew D. Smith · 发表于：IEEE Transactions on Applied Superconductivity · 年份：2003 · DOI：10.1109/tasc.2003.813901 · 被引用次数：28 · 研究领域：Physics of Superconductivity and Magnetism、Quantum and electron transport phenomena、Atomic and Subatomic Physics Research

We recently reported communication up to 60 Gb/s between digital superconductor chips mounted on a passive carrier, using a novel driver circuit that produces a double-flux-quantum pulse. Here, we answer various practical questions pertaining to chip-to-chip and on-chip communication in greater detail. On-chip, the traditional single-flux-quantum driver is adequate, although margins and bit error rate degrade significantly at the microstrip resonance frequency. Chip-to-chip, using the double-flux-quantum driver, shows little frequency dependence, in spite of 13% reduction of signal current in the chip-to-chip transitions. Appropriate microstrip impedance is in the range 4-8 /spl Omega/ for a 4 kA/cm/sup 2/ Josephson junction IC process. Data includes bit errors rates for pseudo-random data in the range 3-27 Gb/s.