Browse Prior Art Database

Bubble Domain Decoder

IP.com Disclosure Number: IPCOM000076078D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Chang, H: AUTHOR [+2]

Abstract

Since all bubble domain shift registers circulate their information content simultaneously in the presence of a rotating field, it is difficult to select and access a specific shift register out of many. Although controlled access is possible by using individual control lines, the large number of control lines required for many shift registers presents a problem of interconnection. The decoder above uses n control wires to steer the output of a bubble domain generator to one of 2n shift registers. The decoder 1 is coupled to bubble domain generator 2 and a control winding 3 determines whether a bubble will be entered into the decoder 1.

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Bubble Domain Decoder

Since all bubble domain shift registers circulate their information content simultaneously in the presence of a rotating field, it is difficult to select and access a specific shift register out of many. Although controlled access is possible by using individual control lines, the large number of control lines required for many shift registers presents a problem of interconnection. The decoder above uses n control wires to steer the output of a bubble domain generator to one of 2n shift registers. The decoder 1 is coupled to bubble domain generator 2 and a control winding 3 determines whether a bubble will be entered into the decoder 1.

B shows an arrangement of permalloy T-bars and I-bars, designated T and I, respectively, with inhibit drive lines A, B, and C. These drive lines direct the propagation direction of bubble domains to perform the function of decoding. The inhibit drive is only effective at locations marked A, B, or C. Elsewhere on the orthoferrite chip, the two leads are brought together closely to annul the inhibit field. Bubble domain propagation is caused by a rotating magnetic field H applied in the plane of the magnetic chip. The various positions of the magnetic field vector are labelled 1, 2, 3, and 4.

A bubble domain at position 4 on T-bar T1 moves to position 1 on the end of T1 when magnetic field H rotates to position 1. However, if an inhibit current is applied to drive line C before H is rotated to direction 1, the...