The circuits of phase-quantum-tunneling device

The authors analyze the dynamics of logic gates and a discrete transmission line composed of PQT (phase-quantum-tunneling) junctions, each of which has characteristics completely dual to those of the Josephson junction. A PQT transistor which is represented as a series connection of two PQT junctions has a periodic threshold-voltage-charge relation with a period 2e. It is shown that it is possible to construct a PQT inverter and other PQT logic gates similar to the FET logic gates. The PQT logic gates have high performance (high switching speed and low power dissipation) even in high-temperature operation. Charge-soliton logic circuits can be formed using discrete PQT transmission lines. It is concluded that PQT devices are highly suitable for high speed electronics using high-T/sub c/ superconductors.<>