Channel bar bubble propagate circuit

Details Channel bar bubble propagate circuit Channel bar bubble propagate circuit

1976-03-29

1977-08-02

Canney, Vincent P.

Communications: electrical

Digital comparator systems

340174VA, G11C 1114, G11C 1900

Patent

active

040400409

ABSTRACT:
The magnetic bubble propagate circuit combines the forces on a bubble due to the properties of a modulated channel in a bubble material with the forces on the bubble due to a field produced by discrete magnetic poles P.sub.1 and P.sub.2 to move the bubble along a predetermined path. The channels may be modulated in width or in depth and be of the mesa or groove type so as to have a channel with periodically spaced stable bubbles positions O which are separated by barrier positions X. The poles P.sub.1 and P.sub.2 consist of soft-magnetic material bars which are placed either along the channel perpendicular thereto such that alternate ends of sequential bars overlap the channel between pairs of stable positions, each bar providing a pole P.sub.1 or P.sub.2, or along the channel parallel thereto such that the ends of the bars fall between adjacent pairs of stable positions, each bar providing a pole P.sub.1 and P.sub.2. The propagate circuit thus has repeated pattern O, X, P.sub.1, O, X, P.sub.2. The bars P.sub.1 and P.sub.2 are periodically magnetized to opposite polarities by an alternating transverse magnetic field which is parallel to the length of the bars to produce a force on the bubbles which are in a stable position to move them across adjacent barrier positions X. When the field reverses, the bubbles move across the next barrier. Turn-around circuits and as transfer gates which may be combined with the basic propagate circuit to form loop and minor-major loop memory arrangements may be similarly constructed. These are made such that the pattern O, X, P.sub.1, O, X, P.sub.2 is not broken either between two parallel propagate circuits to form a loop or between a minor loop and a major loop in a memory arrangement. The minor loop and the major loops are driven by independent perpendicular alternating magnetic fields and thus these fields control the transfer of bubbles between them.

REFERENCES:
patent: 3503054 (1970-03-01), Bobeck et al.
patent: 3644908 (1972-02-01), Bobeck
patent: 3678479 (1972-07-01), Owens
patent: 3693177 (1972-09-01), Owens

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