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Current Source Electronic Drivers for Magnetic Bubble Storage Devices

IP.com Disclosure Number: IPCOM000087182D
Original Publication Date: 1976-Dec-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Gupta, SK: AUTHOR [+4]

Abstract

The operation of magnetic bubble storage devices typically requires electrical currents flowing through conductors in proximity to the surface of the magnetic film. Traditionally, the design of drivers used in bubble devices had been based on a voltage source. However, it is of central importance that magnetic bubbles be influenced by the current in a conductor, rather than by the applied voltage.

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Current Source Electronic Drivers for Magnetic Bubble Storage Devices

The operation of magnetic bubble storage devices typically requires electrical currents flowing through conductors in proximity to the surface of the magnetic film. Traditionally, the design of drivers used in bubble devices had been based on a voltage source. However, it is of central importance that magnetic bubbles be influenced by the current in a conductor, rather than by the applied voltage.

It has been discovered that the operating characteristics of an electronic driver design based on a current source is particularly well suited to magnetic bubble storage devices. In several areas the current-source driver performs significantly better than voltage-source drivers.

For example, whereas common-ground cross talk is frequently a problem with voltage-source drivers, it is not present in current-source drivers. Another example is the current "offset".

With voltage sources, the "off" state is represented by a short circuit across the ends of the conductor line. Various influences can result in some nonzero current flow under these circumstances, e.g., "pick up", producing an "offset" from the desired null current.

Using current sources, the conductor ends are essentially open-circuited, making current flow negligible. Other areas where current-source drivers excel are (a) simplicity in obtaining multilevel or complex pulses and (b) reduction of current shifts due to resistance changes.

A bloc...