EP0470031A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Circuit board EMI suppressor
Assignee: International Business Machines Corp
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Filing: 1991-06-18
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Granted: —
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Expires: 2011-06-18
Abstract
Abstract An improved printed circuit card or second level electronics package (circuit board) including a laminate of lossy material (4) and dielectric material (5) between the voltage supply plane (Vcc) and the ground (GND) plane. The laminate suppresses common mode noise that is generated by active components on the card or circuit board.
Inventors
- 👤 Michael James Brown
- 👤 Leon Charles Radzik
- 👤 Jack Dean Williams
- 👤 Oliver Dewey Pitts
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 12:58
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/0213; H05K1/0216; H05K1/023; H05K1/0233; H05K9/00; H05K9/0007; H05K9/002; H05K9/0039; H05K1/0296; H05K1/0298; H05K2201/00; H05K2201/10; H05K2201/10007; H05K2201/10015; H05K2201/10613; H05K2201/10621; H05K2201/10689
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
93 words
An improved circuit card or board for use in an electronic machine, characterized in that it comprises :- a supply voltage means for providing electrical power to said card or board; a lossy material for attenuating high frequency current affixed to one surface of said supply voltage means; an insulating means disposed on the lossy material; a ground (GND) conductive means disposed on the insulating means; a plurality of devices mounted on said card or circuit board; and conductive means for interconnecting selected devices, the supply voltages means and the ground conductive means.
Claim 2
Dependent Claim
18 words
The improved circuit card or board wherein the supply voltage means and the ground conductive means are planar.
Claim 3
Dependent Claim
98 words
An improved structure for use in a circuit card or circuit board to suppress common mode noise caused by circuit components on said card or board, said structure being characterized in that it comprises :- a supply voltage plane for providing power to the board or card; a plane of lossy material placed in direct contact with a planar surface of the supply voltage plane; a plane of insulating material disposed in contact with a planar surface of said lossy material; and a ground (GND) voltage plane disposed in contact with a planar surface of the insulating material.
Claim 4
Dependent Claim
41 words
The improved structure of Claim 3 further including a bottom insulating plane disposed in contact with a planar surface of the ground voltage plane; and a top insulating plane disposed in contact with another planar surface of said supply voltage plane.
Claim 5
Dependent Claim
18 words
The improved structure of Claim 3 wherein the supply voltage plane and the ground voltage plane are copper.
Claim 6
Dependent Claim
17 words
The improved structure of Claim 3 wherein the lossy material is screen printed onto the voltage plane.
Claim 7
Dependent Claim
138 words
An improved circuit card or circuit board for use in electrical machines, characterized in that it comprises : an internal power plane for providing electrical power to the card or board; a first dielectric insulating plane disposed on one surface of the power plane; a plane of lossy material disposed on another surface of the internal power plane; a second dielectric insulating plane disposed on a planar surface of the lossy material; an internal ground voltage plane disposed in contact with a planar surface of the second dielectric insulating plane; a third dielectric insulating plane disposed in contact with a planar surface of the internal ground voltage plane; a plurality of circuit components mounted to said circuit card or circuit board; and conductive means for interconnecting selective components with the internal power plane and the internal voltage plane.
Claim 8
Dependent Claim
30 words
The improved circuit card or circuit board of Claim 7 further including capacitive means for interconnecting a power pin of at least one circuit component with the internal ground plane.
Claim 9
Dependent Claim
72 words
An improved structure for use in a circuit card or circuit board to suppress common mode noise caused by circuit components on the card or board, said structure characterized in that it comprises : a plane of lossy material; a plane of insulating material disposed in contact with a planar surface of the lossy material; and a ground (GND) voltage plane disposed in contact with a planar surface of the insulating material.
References Cited (Backward Citations)
No citation records indexed.
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