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 f
osc
of the PML modules are not exactly the same. Therefore, in this paper we investigate ways of controlling the f
osc
caused by the frequency drawing effect. By using magnetic interaction between two coils of different modules, the frequencies of two modules f
2
and f
2
can be drawn into the same frequency f
d
. In this case, the value of f
d
depends on the phase differences among the module oscillations, and is not unique. If a common reference ac current with frequency f
0
is applied through coils to each module, f
1
and f
2
can be drawn into the same frequency f
0
. These frequency drawing effects were analyzed on the basis of Royer's equation for the mutual inductance of coils.