Design and Operation of HTS 1:2 Switch Circuit

A Single flux quantum (SFQ) one-to-two (1:2) switch circuit was designed and fabricated by using YBa2Cu3O7-delta ramp-edge junction technology, and the logic operations were investigated. The circuit parameters were optimized by taking account of an Ic spread and a global Ic shift due to an operation temperature change and insufficient run-to-run reproducibility. In addition, the influence of the parasitic inductance on Ic margins was investigated by simulation. A test circuit including the 1:2 switch circuit was successfully operated at temperatures of 52 K-60 K. Finite dc supply current margins obtained at temperatures of 55 K-60 K were comparable to those determined by the simulation.

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