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Longitudinal Stray Field Minimization Techniques

IP.com Disclosure Number: IPCOM000094524D
Original Publication Date: 1965-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Kwei, TC: AUTHOR [+2]

Abstract

Longitudinal stray magnetic fields developed by bit currents in a memory array are minimized by balancing the fields produced by the bit currents.

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Longitudinal Stray Field Minimization Techniques

Longitudinal stray magnetic fields developed by bit currents in a memory array are minimized by balancing the fields produced by the bit currents.

Longitudinal stray fields in an orthogonal mode memory are similar to bit selection fields. If permitted to build up, such fields might interfere with bit selection.

In the middle of the array, longitudinal stray fields produced by bit conductors are effectively balanced by a pairing technique. In this, the direction of bit current is alternated in adjacent wires. If there are n bit wires, n/2 bit wires carry bit current in the first direction and n/2 bit wires carry bit current in the second direction. Over a period of time and space, the number of 0 and 1 bit values tends to average, and there is no net longitudinal field built up in the array. At any position in the array, the number of nearby bit wires providing longitudinal field in the first direction and the number of nearby bit wires providing longitudinal field in the second direction tend to be equal, and the net longitudinal field is zero.

At the ends of the array, however, there is a finite number of nearby bit wires providing longitudinal field in the first direction, with no balancing bit wires to provide longitudinal field in the second direction. The magnetic field effect of nearby wires diminishes with distance. If the first adjacent wire produces +K field, the second wire produces about -K/2 field. The...