Bubble memory coil drive circuit

Details Bubble memory coil drive circuit Bubble memory coil drive circuit

1978-09-05

1979-12-25

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

Rotating field circuits

G11C 1908

Patent

active

041808649

ABSTRACT:
Circuitry for use in bubble memory propagation wherein field drive coils receive energy from an energy storage device (capacitor) through a plurality of selectively located and timed switches. A basic digitally controlled switching arrangement is illustrated in matrix form and, in one embodiment, one capacitor with two voltage sources and, in another embodiment, two capacitors and a single voltage source are utilized. Selective timing of the opening and closing of the switches provides a digitally controlled series of 1/2 sine wave current pulses to meet operating requirements for bubble propagation. Additional variations of the selective timing of switch opening and closings are used to elongate the start and stop pulses to provide better operating margins for these events. Field rotation in either clockwise, or counter-clockwise, or a mix of rotational senses is readily achieved under digital control.

REFERENCES:
patent: 3763478 (1973-10-01), Yoshizawa et al.
patent: 3958160 (1976-05-01), De Niet et al.

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