Frequency Drawing Effect of HiTcSC Multivibrator-Type Phase-Memory Switch Module

A phase memory logic module (PML module) was constructed, based on a high-temperature-superconducting core magnetic multivibrator. The phase logic is decided by the majority of multiple inputs, and therefore is similar to Parametron logic; such modules have applications in the field of neural network systems. However, the frequencies of oscillation fosc of the PML modules are not exactly the same. Therefore, in this paper we investigate ways of controlling the fosc caused by the frequency drawing effect. By using magnetic interaction between two coils of different modules, the frequencies of two modules f2 and f2 can be drawn into the same frequency fd. In this case, the value of fd depends on the phase differences among the module oscillations, and is not unique. If a common reference ac current with frequency f0 is applied through coils to each module, f1 and f2 can be drawn into the same frequency f0. These frequency drawing effects were analyzed on the basis of Royer´s equation for the mutual inductance of coils.