Browse Prior Art Database

Single Output Ladder and Decoder Using Angelfish Circuits

IP.com Disclosure Number: IPCOM000076250D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 72K

Publishing Venue

IBM

Related People

Lin, YS: AUTHOR

Abstract

An angelfish single-output ladder and a decoder for magnetic bubble domains are shown. In both cases, a combined permalloy and conductor loop configuration is deposited on a magnetic chip 10 in which the bubble domains propagate.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 2

Single Output Ladder and Decoder Using Angelfish Circuits

An angelfish single-output ladder and a decoder for magnetic bubble domains are shown. In both cases, a combined permalloy and conductor loop configuration is deposited on a magnetic chip 10 in which the bubble domains propagate.

Fig. 1 shows a single-output ladder and Fig. 2 shows the driving sequence of currents used with the ladder. Various shift register outputs 0-7 enter a read decoder and then the single output ladder. All bubble domains in the ladder propagate to a single detector 12. In this circuit, the conventional permalloy guide rails used in angelfish circuitry are replaced by conductor strips 14. Domain propagation is achieved by energizing the conductors periodically according to the sequence of Fig. 2. For instance, a bubble domain BD which has entered channel 2 and is Located at position 1 during the contraction phase, is forced into the output ladder by a path 1, 2, 3, 4, 5 during the subsequent cycle of driving.

Fig. 3 shows a decoder using permalloy wedges 16 and conductor guide strips 18 which also provide the propagation fields. A more detailed drawing is shown in Fig. 3A, while Figs. 3B and 3C show the driving sequence and a decoding logic table, respectively.

The decoder consists of two angelfish circuits orthogonal to each other, one of which is located on the top of magnetic chip 10 while the other is located on the bottom of magnetic chip 10. The circuitry on top of chip 10 is shown in solid lines, while that at the bottom of chip 10 is shown, in dashed lines. Domain propagation is achieved by current pulses through the conducting strips, rather than by modulation of an exte...