Shieldless, high-speed electrical connectors
View Patent ↗An electrical connector that includes a linear array of electrical blade contacts is disclosed. Each contact may have a free-ended mating portion that extends from a mate surface of a dielectric base. The first linear array may include a first signal contact, a second signal contact positioned adjacent to the first signal contact and forming a differential signal pair therewith, and a ground contact positioned adjacent to the second signal contact. The first signal contact, the second signal contact, and the ground contact may each be elongated in a direction along the linear array.
1. An electrical connector, comprising:
a first row of electrical contacts, comprising a first differential signal pair, the first differential signal pair comprising two broadside-coupled electrical signal contacts positioned along a first row centerline and on opposite sides of a first column centerline, the first column centerline positioned perpendicular to the first row centerline;
a second differential signal pair comprising two broadside coupled electrical signal contacts positioned on opposite sides of a second column centerline, the second column centerline positioned parallel to the first column centerline and perpendicular to the first row centerline;
a third differential signal pair comprising two broadside-coupled electrical signal contacts that are positioned on opposite sides of a third column centerline, the third column centerline positioned parallel to the second column centerline and perpendicular to the first row centerline;
wherein (i) the first column centerline is adjacent to the second column centerline and the second column centerline is adjacent to the third column centerline, (ii) the first, second, and third differential signal pairs are evenly spaced apart by a fixed column-spacing distance measured from the first column centerline to the second column centerline; (iii) a fixed gap distance is defined between the respective two broadside coupled electrical contacts that form each of the first, second and third differential signal pairs; (iv) an aspect ratio of the fixed column-spacing distance to the fixed gap distance is approximately eight to ten; (v) a differential impedance of the differential signal pairs is matched to a system impedance, plus or minus ten ohms, at data transfer rates of 1 Gigabit/sec and 10 Gigabits/sec; and (vi) the electrical connector is devoid of shields between the first differential signal pair and the second differential signal pair.
2. The electrical connector of claim 1 , wherein each of the electrical contacts terminates with a respective fUsible mounting element.
3. The electrical connector of claim 1 , wherein the system impedance is 100 Ohms.
4. The electrical connector of claim 1 , wherein the first row of electrical contacts further comprises a fourth differential signal pair, the fourth differential signal pair comprising two broadside coupled electrical contacts positioned on opposite sides of the third column centerline.
5. The electrical connector of claim 1 , further comprising a first pair of elongated ground contacts positioned along the first column centerline and a second pair of elongated ground contacts positioned along the third column centerline, the first pair of elongated ground contacts comprising two electrical contacts positioned broadside-to-broadside on opposite sides of the first column centerline and the second pair of electrical ground contacts positioned broadside-to-broadside on opposite sides of the third column centerline.
6. The electrical connector of claim 1 wherein the electrical connector is devoid of shields between the second differential signal pair and the third differential signal pair.
7. The electrical connector of claim 6 , further comprising three broadside coupled differential signal pairs positioned along the first column centerline, three broadside coupled differential signal pairs positioned along the second column centerline, and three broadside coupled differential signal pairs positioned along the third column centerline, wherein one of the three differential signal pairs positioned along the second column centerline is a victim pair, and differential signals with rise times of forty picoseconds in six differential signal pairs positioned along the first, second, and third column centerlines that are closest to the victim pair produce no more than six percent worst-case, multi-active cross talk on the victim pair.
8. The electrical connector of claim 1 , wherein the fixed gap distance is approximately 0.3mm to 0.4mm.
9. The electrical connector of claim 8 , wherein an air dielectric is present between the respective two broadside coupled electrical contacts that define the fixed gap distance.