Suppressing EMI with PCB mounted ferrite attenuator
AssigneeHewlett-Packard Company
InventorsAndrew M. Cherniski, Alisa C. Sandoval
Life of this patent
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Abstract
A printed circuit board (PCB) assembly includes a PCB having and a ferrite attenuator. The PCB includes input/output signal paths for carrying signals to and from the PCB, power paths for conducting power to the PCB, and ground paths for connecting the PCB to a ground level. The ferrite attenuator surrounds the input/output signal paths, the power paths, and the ground paths. The PCB assembly is preferably used in a system, such as a computer system, where the ferrite attenuator suppresses electromagnetic interference (EMI) generated in the system.
Claims20
A printed circuit board (PCB) assembly comprising:
- a PCB including:
- input/output signal paths for carrying signals to and from the PCB;
- power paths for conducting power to the PCB;
- and
- ground paths for connecting the PCB to a ground level;
- and
- a ferrite attenuator surrounding the input/output signal paths, the power paths, and the ground paths.
A computer system comprising:
- a first printed circuit board (PCB) including a microprocessor;
- a second PCB electrically coupled to the first PCB and including:
- input/output signal paths for carrying signals between the second PCB and the first PCB board;
- power paths for conducting power to the second PCB;
- and
- ground paths for connecting the second PCB to a ground level;
- and
- a ferrite attenuator installed on the second PCB and surrounding the input/output signal paths, the power paths, and the ground paths.
A method of suppressing electro-magnetic interference (EMI) from a system having printed circuit board (PCB) comprising input/output signal paths for carrying signals to and from the PCB, power paths for conducting power to the PCB, ground paths for connecting the PCB to a ground level, the method comprising the steps of:
- surrounding the input/output signal paths, the power paths, and the ground paths with a ferrite attenuator.
Dependencies are inferred from the claim text.