Magnetic bubble logic apparatus
AssigneeThe United States of America as represented by the Director, National Security Agency
InventorRichard P. Williams
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Abstract
An apparatus for controllable propagation of magnetic domains, or bubbles, through an arrangement of closely spaced magnetic propagating elements arranged in an input stage, a strip-former stage, and a decoder stage. Binary logic circuitry results from selective control of bubble movement through alternate paths of elements, with at least one of said paths producing a domain strip extending the full height of the strip-former stage. The decoder stage includes a propagating element spaced apart from the strip-former stage a distance sufficient to prevent propagation of all domains in the strip-former stage except for the full-height strip. The asymmetric geometry of the strip former stage makes the full elongation of a bubble dependent upon which input provided the bubble.
Claims5
An apparatus for propagation for magnetic bubbles, comprising:
- an input stage including first and second inputs for receiving one or more bubbles;
- an asymmetric strip-former stage adjacent the input stage and including a plurality of propagating elements vertically spaced so as to produce a strip extending the full height of said strip-former stage when a bubble is provided only to a first input and to form a less than full height strip when a bubble is provided only to a second input, and
- a decoding stage having a first output propagating element spaced apart from said strip former a distance sufficient to prevent propagation of all but said full-height strip onto said first output element.
Dependencies are inferred from the claim text.