Transmission of single-flux-quantum pulse between superconductor chips

Hashimoto, Yoshihito; Yorozu, Shinichi; Miyazaki, Toshiyuki
February 2005
Applied Physics Letters;2/14/2005, Vol. 86 Issue 7, p072502
Academic Journal
Single-flux-quantum (SFQ) pulse transmission between superconductor chips mounted on a passive microstrip carrier is reported. In contrast to the earlier work based on a double-flux-quantum (DFQ) driver, we used an SFQ driver; that is, the simplest driver. To deal with transmission loss at solder-bump bonds, we improved the receiver’s sensitivity by reducing its critical current, and optimized the SFQ driver to have as large an output amplitude as possible with a sufficient bias margin. Chip-to-chip transmission on a passive microstrip carrier with 50 μm solder-bump bonds up to 60 Gbps has been achieved at a junction critical current density of 2.5 KA/cm2.


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