Broadside coupled differential transmission lines having alternating wide and narrow portions

Patent metadata

Field	Value
Publication number	US-9338882-B2
Application number	US-201414278330-A
Country	US
Kind code	B2
Filing date	May 15, 2014
Priority date	May 15, 2014
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

A broadside coupled differential design is described herein. The design may include a differential pair. Each trace of the differential pair includes a wide portion and a narrow portion. The wide portion of the first trace of the differential pair is to be aligned with a narrow portion of the second trace of the differential pair. Additionally, the wide portion of the second trace of the differential pair is to be aligned with a narrow portion of the first trace of the differential pair, such that the wide and narrow portions of the traces of the differential pair are staggered.

First claim

What is claimed is:

1. A broadside coupled differential design, comprising:
a first trace that is to alternate between a wide portion and a narrow portion;
a second trace that is to alternate between a wide portion and a narrow portion, wherein the wide portion of the first trace is aligned with the narrow portion of the second trace, and the narrow portion of the first trace is aligned with the wide portion of the second trace.

2. The broadside coupled differential design of claim 1 , wherein a length and a width of the first trace and the second trace is to be adjusted for impedance control and crosstalk mitigation.

3. The broadside coupled differential design of claim 1 , wherein the first trace and the second trace are non-uniform traces such that the geometry of each trace is to vary along a length of each trace.

4. The broadside coupled differential design of claim 1 , wherein the wide portion of the first trace is to be completely coupled with the narrow portion of the second trace.

5. The broadside coupled differential design of claim 1 , wherein the wide portion of the second trace is to be completely coupled with the narrow portion of the first trace.

6. The broadside coupled differential design of claim 1 , wherein the first trace and the second trace are to be fully broadside coupled with a misregistration error between the first trace and the second trace.

7. The broadside coupled differential design of claim 1 , wherein a portion of the first trace and a complimentary portion of the second trace are to form a segment of the broadside coupled differential design.

8. The broadside coupled differential design of claim 7 , wherein a length and a width of the segment is to be designed for impedance control.

9. The broadside coupled differential design of claim 7 , wherein a length and a width of each segment is to be designed for crosstalk mitigation.

10. A system for broadside coupled differential design, comprising:
a differential pair, including a first trace and a second trace that are complimentary, wherein each trace includes a wide portion and a narrow portion, and a wide portion of the first trace of the differential pair is aligned with a narrow portion of the second trace of the differential pair, such that the wide and narrow portions of the differential pair are staggered.

11. The system of claim 10 , wherein a length and a width of the first trace and the second trace is to be adjusted for impedance control and crosstalk mitigation.

12. The system of claim 10 , wherein the first trace and the second trace are non-uniform traces such that the geometry of each trace is to vary along a length of each trace.

13. The system of claim 10 , wherein the wide portion of the first trace is to be completely coupled with the narrow portion of the second trace.

14. The system of claim 10 , wherein the wide portion of the second trace is to be completely coupled with the narrow portion of the first trace.

15. The system of claim 10 , wherein the first trace and the second trace are to be fully broadside coupled with a misregistration error between the first trace and the second trace.

16. The system of claim 10 , wherein a portion of the first trace and a complimentary portion of the second trace are to form a segment of the broadside coupled differential design.

17. The system of claim 16 , wherein a length and a width of the segment is adjusted for impedance control.

18. The system of claim 16 , wherein a length and a width of the segment is adjusted for crosstalk mitigation.

19. A method for a broadside coupled differential design, comprising:
forming a first trace that alternates between a wide portion and a narrow portion;
forming a second trace that alternates between a wide portion and a narrow portion;
aligning the first trace and the second trace, such that the wide portion of the first trace is aligned with the narrow portion of the second trace, and the narrow portion of the first trace is aligned with the wide portion of the second trace.

20. The method of claim 19 , wherein the first trace further includes a plurality of wide and narrow portions and the second trace further includes a plurality of wide and narrow portions.

21. The method of claim 20 , wherein the plurality of wide and narrow portions of the first trace and the plurality of wide and narrow portions of the second trace are staggered such that each wide portion of the first trace is aligned with each narrow portion of the second trace, and each narrow portion of the first trace is aligned with each wide portion of the second trace.

22. The method of claim 19 , wherein the second trace is etched onto a printed circuit board on a layer above the first trace formed into the PCB.

23. The method of claim 22 , wherein the layers of the PCB are formed using an additive process.

24. The method of claim 19 , wherein the broadside coupled differential design is formed in a laminated board with multiple traces.

Assignees

• Intel Corp

Inventors

• Xiao Kai
• Enriquez Shibayama Raul
• Ouyang Gong

Classifications

• H01P3/02

  with two longitudinal conductors · CPC title

• Y10T29/49156

  with selective destruction of conductive paths · CPC title

• H05K2201/09281

  Layout details of a single conductor · CPC title

• H05K1/0245 Primary

  Lay-out of balanced signal pairs, e.g. differential lines or twisted lines · CPC title

• H01P11/003

  Manufacturing lines with conductors on a substrate, e.g. strip lines, slot lines · CPC title