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US 12,764,854 B2Granted
Common mode detection in high speed differential traces
AssigneeDell Products L.P.
InventorsSandor Farkas, Vijender Kumar, Bhyrav Mutnury
Life of this patent
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Abstract
A printed circuit board includes a pair of differential signal traces and a detection trace between the positive signal trace and the negative signal trace. The differential signal traces include a positive signal trace and a negative signal trace. The detection trace detects a common mode (CM) signal present on the differential signal traces.
Claims13
A printed circuit board, comprising:
- a pair of differential signal traces including a positive signal trace and a negative signal trace;
- a detection trace between the positive signal trace and the negative signal trace, the detection trace configured to detect a common mode (CM) signal present on the differential signal traces, wherein the detection trace includes a positive signal directional coupler trace electromagnetically coupled to the positive signal trace and a negative signal directional coupler trace electromagnetically coupled to the negative signal trace and the positive signal directional coupler trace and the negative signal directional coupler trace are coupled to form an output trace, and wherein a CM noise output is provided on the output trace;
- and
- a connector coupled to the output trace.
1 more element
A method, comprising:
- providing, on a printed circuit board, a pair of differential signal traces including a positive signal trace and a negative signal trace;
- providing, between the positive signal trace and the negative signal trace, a detection trace;
- detecting, by the detection trace, a common mode (CM) signal present on the differential signal traces, wherein the detection trace includes a positive signal directional coupler trace electromagnetically coupled to the positive signal trace and a negative signal directional coupler trace electromagnetically coupled to the negative signal trace and the positive signal directional coupler trace and the negative signal directional coupler trace are coupled to form an output trace, and wherein a CM noise output is provided on the output trace;
- and
- providing, on the printed circuit board, a connector coupled to the output trace.
2 more elements
A data communication interface, comprising:
- a transmitter;
- a receiver;
- a pair of differential signal traces between the transmitter and the receiver, the differential signal traces including a positive signal trace and a negative signal trace;
- and
- a detection trace between the positive signal trace and the negative signal trace, the detection trace configured to detect a common mode (CM) signal present on the differential signal traces, wherein the detection trace includes a positive signal directional coupler trace electromagnetically coupled to the positive signal trace and a negative signal directional coupler trace electromagnetically coupled to the negative signal trace and the positive signal directional coupler trace and the negative signal directional coupler trace are coupled to form an output trace, and wherein a CM noise output is provided on the output trace.
2 more elements
Dependencies are inferred from the claim text.