An 8-b Josephson digital signal processor

A 6.3 K-gate Josephson digital signal processor (DSP) that performs 240-ps 8-b multiplication and 410-ps 13-b addition is described. The structure of the DSP, which is based on a three-stage pipeline, and the design of the components used in the DSP are reviewed. The DSP contains 23000 Josephson junctions on a 5*5-mm die and was fabricated using 1.5- mu m all-niobium Josephson techniques. Measurements indicate that the DSP can attain a nonparallel processing speed of 1 giga-operation per second (GOPS) with 12-mW power dissipation.<
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