Browse Prior Art Database

Two Conductor Single Level Shift Register for Bubbles

IP.com Disclosure Number: IPCOM000084114D
Original Publication Date: 1975-Sep-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Hannon, DM: AUTHOR

Abstract

A two-conductor shift register utilizing one level of metallurgy and a confinement channel is described.

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Two Conductor Single Level Shift Register for Bubbles

A two-conductor shift register utilizing one level of metallurgy and a confinement channel is described.

The shift register contains a confinement channel having one serpentine conductor located on one side thereof and a second serpentine conductor located on the other side. The second conductor is a mirror image of the first conductor, however, these conductors are positioned so as to be out-of-phase. The confinement channel is an etched groove, a dam or another conductor pattern.

One embodiment of such a shift register is shown in Fig. 1. The operation of the shift register is as follows. Starting with a bubble in position 1, current in conductor A causes the bubble to move to position 2. Current is turned off in conductor A and on in conductor B, thereby causing the bubble to move to position 3. Current is turned off in conductor B and reversed in conductor A, thereby causing the bubble to move to position 4. Current is turned off in conductor A and reversed in conductor B, thereby causing the bubble to move to position 5 which is the equivalent of position 1.

A second embodiment is shown in Fig. 2. Here the bubble moves from one slot to another under the center conductor. The operation is as follows. Current in the conductor C causes the bubble to be at position 1. Current is turned off of conductor C and on in conductor D and D', causing the bubble to move to position 2. Current is then turned off D and D...