A multiplexer employing Josephson functional gates

A new Josephson multiplexer is designed and analyzed. Experimentally, the multiplexer is fabricated by standard Pb alloy technology with 5-µm line width, and its operation is successfully performed. The typical operating margin is ±16 percent for the gate current. The multiplexer is a four-way multiplexer with a 2-4 decoder consisting of functional AND gates. The functional gates are composed of two asymmetric logics arranged in a series on its gate current line. These gates realize 2-4 decoder and data selector functions. The multiplexer offers advantages of integrated-circuit area reduction, low power dissipation, and high-speed operation.