Apparatus to minimize integrated circuit heatsink E.M.I. radiation
First Claim
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1. An apparatus for reducing EMI interference associated with an electronic device, comprises:
- at least one electrically conductive structure comprising;
a heat sink in thermal communication with said electronic device, said heat sink having a bottom surface proximate to said electronic device, a top surface disposed opposite said bottom surface, and at least one side surface disposed between said top and bottom surfaces;
at least one separate electrically conductive plate, having at least one electrical contact for electrically coupling to a reference plane, with said at least one electrically conductive plate physically and electrically insulated from direct contact with said heat sink, and solely disposed proximate to at least one of said at least one side surface.
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Abstract
A set of conductive plates are positioned adjacent to and in close proximity with a unidirectional heatsink on a high frequency integrated circuit. The set of plates is generally electrically attached to the same ground potential voltage supply as the integrated circuit and serves to damped unwanted radio frequency electromagnetic radiation normally emitted by heatsinks. The same arrangement of plates can also serve as an external electromagnetic interference shield apparatus for the integrated circuit. The plates may alternatively be comprised of a conductive mesh to allow air flow through the plates.
46 Citations
15 Claims
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1. An apparatus for reducing EMI interference associated with an electronic device, comprises:
at least one electrically conductive structure comprising; a heat sink in thermal communication with said electronic device, said heat sink having a bottom surface proximate to said electronic device, a top surface disposed opposite said bottom surface, and at least one side surface disposed between said top and bottom surfaces; at least one separate electrically conductive plate, having at least one electrical contact for electrically coupling to a reference plane, with said at least one electrically conductive plate physically and electrically insulated from direct contact with said heat sink, and solely disposed proximate to at least one of said at least one side surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus to suppress radio frequency radiation from packaged integrated circuits, comprises;
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a packaged integrated circuit disposed within an electronic circuit package, said package having a unidirectional heat sink attached thereto, two planar conductive plates electrically isolated from while disposed in close proximity with said unidirectional heat sink, said conductive plates being aligned parallel to a predetermined direction of preferred air flow, with each one of said planar conductive plates having at least one electrical contact for connection to a voltage reference potential.
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Specification