100-GHz Single-Flux-Quantum Bit-Serial Adder Based on 10-${\rm kA/cm}^{2}$ Niobium Process

  title={100-GHz Single-Flux-Quantum Bit-Serial Adder Based on 10-\$\{\rm kA/cm\}^\{2\}\$  Niobium Process},
  author={Masami Tanaka and Hiroyuki Akaike and Akira Fujimaki and Yuki Yamanashi and Nobuyuki Yoshikawa and S.. Nagasawa and Kazuyoshi Takagi and Naofumi Takagi},
  journal={IEEE Transactions on Applied Superconductivity},
This paper reports the design and test results of a single-flux-quantum (SFQ) bit-serial adder, which we designed with a target-clock frequency of 100 GHz, to investigate several techniques for producing ultra-high-speed computations using SFQ circuits. The bit-serial adder was designed based on a new cell library developed for the ISTEC Advanced Process, where the critical current density and McCumber-Stewart parameters of Josephson junctions were increased to 10 kA/cm2 and 2.0, respectively… CONTINUE READING


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