Abstract
AbstractThis paper proposes a Josephson threshold logic circuit, which is best suited to high‐speed operations. Using the proposed circuit, the adder can be constructed by four Josephson elements. The scale of the circuit can be reduced both in the number of circuits and the number of logic stages, compared with the conventional Josephson logic circuits. The circuit is shown to be useful in the realization of the high‐speed and highly integrated adders and multipliers. Then it is demonstrated that the Josephson threshold logic circuit can be constructed by the magnetically coupled interferometer element, the current‐injection interferometer element and the direct‐coupled element. A typical circuit construction is shown with the adder as an example. To verify the correct operation of the Josephson threshold logic circuit, a 1‐bit adder by magnetically coupled interferometer elements was constructed by Nb‐Pb alloy process, and the operation of the circuit was verified.
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