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Temperature Controlled NDRO Ferrite Core Storage Cell

IP.com Disclosure Number: IPCOM000092899D
Original Publication Date: 1967-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Dehais, RE: AUTHOR

Abstract

By using different temperatures at the time of storing information into a ferrite core and nondestructively reading that information out of the core, the signal-to-noise ratio of the core can be improved and the drive current requirements for the core can be reduced.

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Temperature Controlled NDRO Ferrite Core Storage Cell

By using different temperatures at the time of storing information into a ferrite core and nondestructively reading that information out of the core, the signal-to- noise ratio of the core can be improved and the drive current requirements for the core can be reduced.

The usefulness of a storage ferrite core system is critically dependent upon the ability to sense and discriminate between signal and noise. The ability to discriminate is in turn dependent upon the waveshape and amplitude of the drive current used to switch the cores. However, advantage can be taken of the temperature dependency of ferrite cores to increase the signal-to-noise ratio without changing the drive current requirements for the cores. This is done by storing at one optimum temperature while reading at another optimum temperature.

The optimum combination of writein and readout temperatures varies from core to core. For example, in the case of low-threshold cores, it may be desirable to store at a low temperature and interrogate at a higher temperature to increase the permis sible margins for writing information into the core while decreasing the drive requirements for reading information out of the core. Alternatively, in the case of high-threshold cores, it may be more advantageous to store information at a high temperature to reduce the switching threshold while decreasing the temperature when reading so as to improve the squareness....