QFP WIRING PROBLEM - INTRODUCTION AND ANALYTICAL CONSIDERATIONS

A novel Josephson device with many desirable properties-fast switching speed, high operation frequency, and low power dissipation-has been r esearched these several years: the Quantum Flux Parametron (QFP). This paper discusses the interconnection problem of QFP circuits, where wi re inductance matching and high clock rate restrict the lengths of int erconnection wires. A layout model of QFP interconnection wires is cla rified, and the effects of wire inductance matching on interconnection area and wire length are analyzed. The limitation comes from the boun d of the number of squares of wires, therefore similar effects will ex ist where wire resistance is bounded. This paper discusses a simple wi ring and buffering algorithm for QFP circuits, in which wire inductanc e is adjusted and the maximum wire length is controlled, to prove that any logic is realizable as a QFP circuit.