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 YBa
₂
Cu
₃
O
_7-delta
ramp-edge junction technology, and the logic operations were investigated. The circuit parameters were optimized by taking account of an I
_c
spread and a global I
_c
shift due to an operation temperature change and insufficient run-to-run reproducibility. In addition, the influence of the parasitic inductance on I
_c
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.