Printed circuit board with enhanced immunity to common-mode noise
AssigneeHon Hai Precision Industry Co., Ltd.
InventorCHIH-HAO LIN
Life of this patent
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Abstract
A design for printed circuit board with reduced susceptibility to common-mode noise includes a first substrate, a differential pair of signal lines with two differential transmission lines laid on the first substrate, a second substrate, a metal layer located between the first substrate and the second substrate, and a grounding layer The second substrate is located between the second substrate and the grounding layer, and a conductive structure is located in the second substrate and couples the metal layer to the grounding layer. A length of the metal layer is substantially equal to a length of each of the two differential transmission lines.
Claims20
A printed circuit board comprising:
- a first substrate;
- a differential pair signal lines with two differential transmission lines laid on the first substrate;
- a second substrate;
- a metal layer located between the first substrate and the second substrate;
- a grounding layer, and the second substrate is located between the second substrate and the grounding layer;
- and
- a conductive structure located in the second substrate and coupling the metal layer to the grounding layer;
- wherein a length of the metal layer is substantially equal to a length of each of the two differential transmission lines.
A printed circuit board comprising:
- a first substrate;
- a differential pair signal lines with two differential transmission lines laid on the first substrate;
- a second substrate;
- a metal layer located between the first substrate and the second substrate;
- a grounding layer, and the second substrate is located between the second substrate and the grounding layer;
- and
- a conductive structure located in the second substrate and coupling the metal layer to the grounding layer;
- wherein each of the two differential transmission lines extends in a first direction, and the metal layer extends in the first direction and is symmetrical with respect to a centerline defined between the two differential transmission lines.
Dependencies are inferred from the claim text.