Gm Global Technolgoy Operations, Inc.

Delco Electronics Corporation

Robert J Wallace

Peter J Schubert

Norman J Roth

Domenica N Hartman

Propagation of electromagnetic interference waves is eliminated or substantially reduced by providing an electromagnetic interference shield suitable for shielding electromagnetic interference or radio frequency interference which are generated by offending components on a monolithic integrated circuit chip. The shield is disposed over the offending components of the integrated circuit and is sufficiently large to eliminate or substantially reduce the propagation of any offending interference waves. Alternatively, the shield may be disposed over a non-offending component to prevent radiated electromagnetic interference from entering the non-offending component. The shield is electrically conductive and maintained at a predetermined, primarily constant, electrical potential with respect to the underlying integrated circuit chip. The shield is integral with the electrically conductive tape used with tape automated bonding manufacturing techniques, or, in an alternative embodiment, the flexible conductive circuitry pattern used with flexible circuitry manufacturing techniques.

Integrated circuit shield

A metal-oxide semiconductor field-effect transistor (MOSFET) device having an insulating barrier buried in the substrate between the device's source and drain regions. The insulating barrier can be in contact with the source region of the MOS device. The barrier is implanted in the substrate through a masked implantation of high doses of oxygen, followed by an annealing of the oxygen to form the silicon dioxide insulating barrier. The insulating barrier can be either discrete or part of a continuous sheet of silicon dioxide placed below the silicon substrate. Placing the insulating barrier between the source and drain regions substantially diminishes the punch-through effect of subsurface currents, thereby increasing the punch-through voltage. This permits the construction of MOS devices having shorter channel lengths with resulting higher circuit density and greater speed.

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Southfield, MI, United States of America

Robert J Wallace