A high speed adder using Josephson elements

A high-speed adder employing Josephson elements is proposed. This adder is constructed by using a novel Exclusive-OR logic and a high speed carry propagation technique. The principle of the operation is described and the simulation of the adder, of which model is based on the distributed parameter circuit, is illustrated in detail. The results of the simulation show that the adder operates with gate delay of order of 28ps at the dissipation levels of 125μw/ gate. The main advantages of this adder are its simple construction and extremely high operating speed.