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Browse Prior Art Database

Balanced Magnetic Film Sensing

IP.com Disclosure Number: IPCOM000096416D
Original Publication Date: 1963-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Taren, WJ: AUTHOR

Abstract

Common mode noise rejection for bit drive signals occurs when bit drive conductors and sense conductors are connected in pairs to a center-tapped output transformer. This bit noise rejection makes large capacity high speed film memories independent of sense line recovery problems due to bit noise.

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Balanced Magnetic Film Sensing

Common mode noise rejection for bit drive signals occurs when bit drive conductors and sense conductors are connected in pairs to a center-tapped output transformer. This bit noise rejection makes large capacity high speed film memories independent of sense line recovery problems due to bit noise.

Magnetic films 1 and 2 are on the top of metal substrate 11 and form row nA. Magnetic films 3 and 4 on the bottom form row nB. Each film operates in the orthogonal mode. Writing into a film requires the combination of a relatively large word field coincident to a small bit

Magnetic films 1 and 2 are on the top of metal substrate 11 and form row nA. Magnetic films 3 and 4 on the bottom form row nB. Each film operates in the orthogonal mode. Writing into a film requires the combination of a relatively large word field coincident to a small bit field, to rotate the magnetic orientation of the film selectively to a 1 direction or to an opposite 0 direction. Reading of a film requires only the application of the word field and polarity sensing of the resulting rotation.

Bit Current n for the two similarly selected rows n in planes A and B is applied to both Bit Line A and Bit Line B simultaneously. Resistances 12 and 13 are equal, causing bit current n to divide equally. traversing films 1... 4, and generating equal and opposite bit noise signals in Sense Lines A and B. Bit current, however, has no appreciable effect on the films in the absence...