ELECTRICAL ANALOG OF A SINGLE-FLUX QUANTUM DEVICE FOR LOGIC DESIGN

Some of the behaviour of a quantron (one-junction interferometer) with a Josephson gate is simulated. This quantron was proposed by Likharev in 1977 and is called the Parametric Quantron. By proper control of its critical current with time, alternative stable states of the quantron can be selected by a switching signal whose product of the energy dissipation Ec and the switching time τ is as low as 102h (where h is Planck's constant). In this experiment, a simulator based on the analogy between a Josephson junction and a phase-locked loop is used. Analog systems are flexible and easier to assemble than the mechanical analog. © 1979 The Japan Society of Applied Physics.