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Reducing Delta Noise in 3 D Ferrite Core Memories

IP.com Disclosure Number: IPCOM000090811D
Original Publication Date: 1969-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Gogos, B: AUTHOR [+3]

Abstract

Delta noise in 3-D ferrite core memories is reduced by post-write disturbance of sense linked cores. To accomplish this, the Z driver circuits, which are coupled to core windings, serving both as sense lines and inhibit drive lines, are poised to apply read coercion to the linked cores for a brief period subsequent to the write phase of each storage cycle. A method of producing such post-write disturb pulses is shown.

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Reducing Delta Noise in 3 D Ferrite Core Memories

Delta noise in 3-D ferrite core memories is reduced by post-write disturbance of sense linked cores. To accomplish this, the Z driver circuits, which are coupled to core windings, serving both as sense lines and inhibit drive lines, are poised to apply read coercion to the linked cores for a brief period subsequent to the write phase of each storage cycle. A method of producing such post-write disturb pulses is shown.

The Z-linked cores in the 1 state are forced into modified states by the post- write excitation in the read direction resulting in reduced irreversible flux changes during the next read operation. The flux states of cores storing 0 information remain essentially unaffected. Hence, during the read phase of the subsequent memory cycle, the worst case difference in output of any pair of half-selected, sense-linked cores in opposed magnetic states, which represents the worst case delta noise component of the sensed signal, is reduced significantly due to the previous post-write disturbance.

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