Cable connector for high speed interconnects
A cable termination that provides low signal distortion even at high frequencies. Conductive elements of the cable are fused to edges of signal conductors in a cable connector or other component terminating the cable. For terminating a differential pair, the conductive elements of the cable may be terminated to opposing edges of a pair of signal conductors in the cable termination. The conductive elements may be shaped such that the spacing between signal paths passing through the conductive elements of the cable and into the signal conductors of the cable termination is uniform.
1. A cable assembly, comprising:
a cable comprising two conductive elements; and
a cable termination component, comprising:
a pair of signal conductors, the signal conductors having flat contact tails comprising broadsides and edges joining the broadsides, wherein:
the signal conductors are held with the flat contact tails in an edge-to-edge configuration, with a first edge of a first signal conductor of the pair facing a second edge of a second signal conductor of the pair, and
the two conductive elements of the cable are each attached to a respective edge of the first and second edges.
2. The cable assembly of claim 1 , wherein the two conductive elements of the cable are attached to the first and second edges by welding.
3. The cable assembly of claim 1 , wherein an edge of a contact tail of a signal conductor with a conductive element of the cable attached has a termination thickness, the termination thickness being no more than 10% greater than a thickness of the edge of the contact tail of the signal conductor without the conductive element of the cable attached.
4. The cable assembly of claim 1 , wherein:
each of the pair of signal conductors has a mating contact portion and an intermediate portion extending between the contact tail and the mating contact portion;
the contact tails of the pair of signal conductors are separated by a first distance; and
the mating contact portions of the pair of signal conductors are separated by a second distance, the second distance being smaller than the first distance such that a separation at an attachment location differs from the first distance by no more than 10%.
5. The cable assembly of claim 1 , wherein a separation between attachment locations of the two conductive elements of the cable to the pair of signal conductors is configured to yield an impedance matching an impedance of the cable.
6. The cable assembly of claim 1 , wherein:
the two conductive elements of the cable are joined with the first and second edges, respectively, at fillet joints.
7. The cable assembly of claim 6 , wherein:
the fillet joints are formed by running a laser along the edges.
8. The cable assembly of claim 1 , wherein:
the pair of signal conductors of the cable termination component comprises mating contact portions opposite the contact tails.
9. The cable assembly of claim 8 , wherein:
the mating contact portions of the pair of signal conductors of the cable termination component are shaped as pins.
10. The cable assembly of claim 9 , wherein:
the mating contact portions of the pair of signal conductors of the cable termination component are formed by rolling metal sheets.
11. The cable assembly of claim 8 , wherein:
the mating contact portions of the pair of signal conductors of the cable termination component comprise receptacles.
12. The cable assembly of claim 1 , comprising:
a shield surrounding the cable termination component, wherein:
the cable is a twin-ax cable comprising a shield surrounding the two conductive elements, and
the shield of the cable is coupled to the shield surrounding the cable termination component.
13. A cable assembly in an electronic system, wherein:
the electronic system comprises:
a printed circuit board comprising an edge and a second location spaced from the edge;
the cable assembly, comprising:
a plurality of cables, each of the plurality of cables comprising two conductive elements, and each of the two conductive elements comprising a first end extending to a second end; and
a connector, wherein:
the connector is mounted to the printed circuit board adjacent the edge,
the connector comprises a plurality of pairs of signal conductors spaced from each other, the signal conductors of the plurality of pairs having contact tails in an edge-to-edge configuration comprising a flat portion with broadsides and edges joining the broadsides
the first ends of the two conductive elements of each of the plurality of cables are each selectively attached to an edge of a respective contact tail of a pair of signal conductors of the plurality of pairs of signal conductors, and
the second ends of the two conductive elements of each of the plurality of cables are coupled to the printed circuit board at the second location.
14. The cable assembly of claim 13 , wherein the two conductive elements of the plurality of cables are attached to the respective edges of the contact tails at welds.
15. The cable assembly of claim 13 , comprising:
a plurality of contact tails configured for mounting to the printed circuit board.
16. The cable assembly of claim 15 , wherein:
the plurality of contact tails are disposed in columns,
the contact tails in a same column are spaced from each other between 1 mm and 2.5 mmm, and
the connector operates over frequencies between at least 15 GHz and 50 GHz.
17. The cable assembly of claim 13 , wherein:
the contact tails of a pair of signal conductors of the plurality of pairs of signal conductors are aligned edge-to-edge.
18. The cable assembly of claim 17 , wherein:
the printed circuit board is a first printed circuit board;
the electronic system further comprises:
a second printed circuit board; and
a second connector mated with the first connector and mounted to the second printed circuit board, wherein the second printed circuit board is orthogonal to the first printed circuit board.
19. The cable assembly of claim 13 , wherein:
the connector is a first connector;
the electronic system further comprises a second connector mounted to the printed circuit at the second location; and
the second ends of the two conductive elements of each of the plurality of cables are coupled to the printed circuit board via the second connector.
20. The cable assembly of claim 19 , wherein:
the second connector is separated from the first connector by at least 6 inches.