Evaluation of flux-based logic schemes for high-T/sub c/ applications

Three digital logic families that can be made using nonhysteretic Josephson junctions (potentially the only kind of Josephson device realizable with superconductors having high transition temperatures) are analyzed. These logic families utilize magnetic flux-transfer, and are characterized by very low power dissipation. Rapid single flux quantum (RSFQ) and phase-mode logic are both based on pulse propagation. The quantum flux parametron (QFP) logic family is based on current latching. Simulations of RSFQ, Phase-Mode, and QFP logic families using high-T/sub c/ junction parameters are presented to demonstrate the compatibility of these logic families with the perovskite superconductors. The operation of these logic families is analyzed, and the advantages and disadvantages of each are discussed.