Static information storage and retrieval – Magnetic bubbles – Rotating field circuits
Patent
1989-01-06
1992-04-21
Popek, Joseph A.
Static information storage and retrieval
Magnetic bubbles
Rotating field circuits
365 1, 371 13, G11C 1908
Patent
active
051074583
ABSTRACT:
A transient ionizing radiation tolerant peripheral system for a magnetic bubble memory includes a transient ionizing radiation tolerant rotating field coil driver and a transient ionizing radiation tolerant function gate controller. Both the transient ionizing radiation tolerant rotating field coil driver and the transient ionizing radiation tolerant function gate controller have predrivers each having a bipolar switching transistor having a base, a collector and an emitter. An anti-saturation diode is connected to the collector of the bipolar switching transistor to prevent its switching speed from being reduced by being driven into saturation by excess charge carriers generated by transient ionizing radiation. A photocurrent compensator is connected to the switching transistor and draws current away from its base during exposure to transient ionizing radiation. This prevents the excess charge carriers generated by the transient ionizing radiation from increasing the current flowing in the switching transistor's collector-emitter circuit. The transient ionizing radiation tolerant function gate controller having the predriver generates constant current during exposure to transient ionizing radiation and energizes the magnetic bubble memory during generate, replicate and swap operations.
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Popek Joseph A.
Science Applications International Corporation
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