Bubble memory having non-uniformly wound Y drive field coil

Details Bubble memory having non-uniformly wound Y drive field coil Bubble memory having non-uniformly wound Y drive field coil

1980-09-29

1981-12-29

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

Disposition of elements

365 6, 365 15, G11C 1908

Patent

active

043085911

ABSTRACT:
In a field-access magnetic bubble memory X and Y coils encircle the chip for providing the rotating XY magnetic drive field when conventional drive signals are applied thereto. At least one of the coils is non-uniformly wound to provide a first predetermined magnitude of the drive field in first predetermined chip areas and a second lesser predetermined magnitude of the drive field in a second chip area. In the embodiment disclosed the chip has a dual-block replicate architecture with gates and bubble detectors requiring a relatively high drive field located in peripheral edge areas at the bottom and top of the chip. A plurality of data storage loops requiring a relatively low drive field are located in the medial portion of the chip. The outer layer of the Y coil is non-uniformly wound to provide a gap in registration with the medial area of the chip. As a result, the magnitude of the drive field is higher in the peripheral edge areas than in the medial storage area, making possible a reduction in coil power consumption.

REFERENCES:
patent: 4045786 (1977-08-01), Lee et al.

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