A novel current injection Josephson logic cell with OR/AND personalization

A novel current injection Josephson logic cell with no need of thin film resistors for proper input output isolation is described. It comprises three parallel connected branches with three junctions each. The control currents are symmetrically applied to the side branches, whereas the feed point position defines the behaviour of the cell as an OR or AND gate. Input-output isolation ratio of about 20 is obtained by using the non-linearity of the I-V curve of the junctions.The static threshold curve of this cell can be optimized through the choice of the critical current of the junctions in each branch. Computer simulations performed on this cell show its high input sensitivity, high gain and high switching dynamics due to reduced turn-on-delay and lowered capacitance.