Browse Prior Art Database

Magnetic Core Winding

IP.com Disclosure Number: IPCOM000096373D
Original Publication Date: 1963-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Marcy, CT: AUTHOR

Abstract

Right angle stacking of the wires passing through magnetic cores in a matrix memory allows adjacent perpendicular wires to provide air gap isolation between those of the wires which are mutually parallel.

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Magnetic Core Winding

Right angle stacking of the wires passing through magnetic cores in a matrix memory allows adjacent perpendicular wires to provide air gap isolation between those of the wires which are mutually parallel.

Capacitance between adjacent wires can cause large transients which become destructive noise if they extend into read time. The right angle stacking technique shown minimizes coupling of noise from all the wires to the sense wire. The air gap created by the X wire minimizes capacitive coupling between the Y wire and the inhibit wire which is parallel. The inhibit wire decouples the X wire and the sense wire.

Isolating the Y wire from the inhibit wire minimizes a capacitive overshoot on the Y current which could extend into read time without such isolation. Staggered turnon of X and Y half- select currents is generally used in magnetic memories to reduce core noises and to minimize transients at the exact instant of read time by allowing some of them to occur earlier. The X half-select current appears first, since the X winding is most closely coupled to the sense winding and its noise would be most destructive of signal output. Coupling of the X winding to the sense winding is greatest because the two windings are parallel and in large memories have significant length of such parallelism After a time for the X current transients to quiet down, the Y current appears.

Since the Y wire and the sense wire are perpendicular and generally isolate...