IP Library › Granted Patent US 11,026,321

Granted Patent B2

US 11,026,321 · App. 16/264,939 · Granted Jun 1, 2021

Information handling system comprising a processor coupled to a board and including a differential trace pair having a first straight differential trace and a second serpentine shape differential trace

Inventors: Umesh Chandra (Santa Cruz, CA); Chun-Lin Liao (Taipei, TW); Bhyrav M. Mutnury (Round Rock, TX)

Assignee: Dell Products L.P.

H05K1/0248 H01P3/026 H05K1/0228 H05K1/0245 H05K1/112 H05K1/181 H05K3/06 H05K2201/09227 H05K2201/09236 H05K2201/09281 H05K2201/09727

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Quick Facts

Patent No.: US 11,026,321
App. No.: 16/264,939
Granted: Jun 1, 2021
Kind: B2

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Abstract

A differential trace pair system includes a board including a board structure having a first, a second, a third, and a fourth board structure member, wherein a distance between the first and the third board structure members is longer than a distance between the second and the fourth board structure members. The differential trace pair system further includes a differential trace pair that includes a first differential trace extending between the first and the third board structure members and a second differential trace extending between the second and the fourth board structure members. The second differential trace having a serpentine structure that includes a first portion that continuously transitions away from the first differential trace and a second portion that is contiguous with the first portion, the second portion continuously transitions towards the first differential trace.

Claims (44)

1. A differential trace pair system, comprising:

a processor;

a board including a board structure that couples the processor to the board, wherein the board structure includes a first board structure member, a second board structure member, a third board structure member, and a fourth board structure member, wherein a distance between the first board structure member and the third board structure member is longer than a distance between the second board structure member and the fourth board structure member; and

a differential trace pair that is provided in the board and that includes:

a first differential trace extending between the first board structure member and the third board structure member and having a first width; and

a second differential trace extending between the second board structure member and the fourth board structure member, the second differential trace having a serpentine structure that includes:

a first portion of the second differential trace that is substantially parallel with a paired first portion of the first differential trace and that has the first width;

a second portion of the second differential trace that is contiguous with the first portion of the second differential trace and that transitions away from the first differential trace and the first portion of the second differential trace, wherein the second portion has at least one second width that is greater than the first width of a paired second portion of the first differential trace that is not parallel with the second portion; and

a third portion of the second differential trace that is contiguous with the second portion of the second differential trace and that transitions away from the second portion of the second differential trace towards the first differential trace and a fourth portion of the second differential trace that is substantially parallel with a paired fourth portion of the first differential trace, that has the first width, and that is contiguous with the third portion, wherein the third portion has the at least one second width that is greater than the first width of a paired third portion of the first differential trace that is not parallel with the third portion of the second differential trace.

2. The differential trace pair system of claim 1 , wherein the at least one second width of the second portion of the second differential trace increases as the second portion transitions away from the first differential trace and the first portion of the second differential trace, wherein the at least one second width of the third portion of the second differential trace decreases as the second portion transitions away from the second portion of the second differential trace towards the first differential trace and the fourth portion of the second differential trace.

3. The differential trace pair system of claim 1 , wherein the first differential trace and the second portion of the second differential trace form an increasing spacing therebetween as the second portion of the second differential trace transitions away from the first differential trace and the first portion of the second differential trace and the first differential trace and the third portion of the second differential trace form a decreasing spacing therebetween as the third portion of the second differential trace transitions away from the second portion of the second differential trace toward the first differential trace and the fourth portion of the second differential trace.

4. The differential trace pair system of claim 1 , wherein the second portion of the second differential trace and the third portion of the second differential trace have substantially the same length.

5. The differential trace pair system of claim 1 , wherein the second differential trace is configured to include one or more of the serpentine structure so that the first and second differential traces have substantially the same length.

6. The differential trace pair system of claim 1 , wherein the second portion of the second differential trace has the first width at a first end that is contiguous with the first portion and the at least one second width that is greater than the first width at a second end that is contiguous with the third portion, wherein the third portion of the second differential trace has the at least one second width at a first end that is contiguous with the second portion of the second differential trace and the first width at a second end of the third portion that is contiguous with the fourth portion, and a ratio of the at least one second width to the first width is up to a range from 1.1 to 2.

7. The differential trace pair system of claim 1 , wherein the serpentine structure is configured to reduce impedance mismatches between the first differential trace and the second differential trace, and a crosstalk between the second differential trace and one or more adjacent traces.

8. An information handling system (IHS), comprising:

a processor;

a circuit board having a connection pad array that couples the processor to the circuit board, wherein the connection pad array includes a first connection pad, a second connection pad, a third connection pad, and a fourth connection pad;

a differential trace pair that is provided in the circuit board and that includes:

a first differential trace extending between the first connection pad and the third connection pad and having a first width; and

a second differential trace extending between the second connection pad and the fourth connection pad, the second differential trace having a serpentine structure that includes:

a first portion of the second differential trace that is substantially parallel with a paired first portion of the first differential trace and that has the first width;

9. The IHS of claim 8 , wherein the at least one second width of the second portion of the second differential trace increases as the second portion transitions away from the first differential trace and the first portion of the second differential trace, wherein the at least one second width of the third portion of the second differential trace decreases as the second portion transitions away from the second portion of the second differential trace towards the first differential trace and the fourth portion of the second differential trace.

10. The IHS of claim 8 , wherein the first differential trace and the second portion of the second differential trace form an increasing spacing therebetween as the second portion of the second differential trace transitions away from the first differential trace and the first portion of the second differential trace and the first differential trace and the third portion of the second differential trace form a decreasing spacing therebetween as the third portion of the second differential trace transitions away from the second portion of the second differential trace toward the first differential trace and the fourth portion of the second differential trace.

11. The IHS of claim 8 , wherein the second portion of the second differential trace and the third portion of the second differential trace have substantially the same length.

12. The IHS of claim 8 , wherein a distance between the first connection pad and the third connection pad is longer than a distance between the second connection pad and the fourth connection pad, and wherein the second differential trace is configured to include one or more of the serpentine structure so that the first and second differential traces have substantially the same length.

13. The IHS of claim 8 , wherein the second portion of the second differential trace has the first width at a first end that is contiguous with the first portion and the at least one second width that is greater than the first width at a second end that is contiguous with the third portion, wherein the third portion of the second differential trace has the at least one second width at a first end that is contiguous with the second portion of the second differential trace and the first width at a second end of the third portion that is contiguous with the fourth portion, and a ratio of the at least one second width to the first width is up to a range from 1.1 to 2.

14. The IHS of claim 8 , wherein the serpentine structure is configured to reduce impedance mismatches between the first differential trace and the second differential trace, and a crosstalk between the second differential trace and one or more adjacent traces.

15. A method for forming a differential trace pair on a board, the method comprising:

providing the board as to include a board structure that couples a processor to the board, wherein the board structure includes a first board structure member, a second board structure member, a third board structure member, and a fourth board structure member, wherein a distance between the first board structure member and the third board structure member is longer than a distance between the second board structure member and the fourth board structure member;

forming a first differential trace extending between the first board structure member and the third board structure member and having a first width; and

forming a second differential trace extending between the second board structure member and the fourth board structure member,

wherein forming the second differential trace includes:

forming a first portion of the second differential trace that is substantially parallel with a paired first portion of the first differential trace and that has the first width;

forming a second portion of the second differential trace that is contiguous with the first portion of the second differential trace and that transitions away from the first differential trace and the first portion of the second differential trace, wherein the second portion has at least one second width that is greater than the first width of a paired second portion of the first differential trace that is not parallel with the second portion; and

forming a third portion of the second differential trace that is contiguous with the second portion of the second differential trace and that transitions away from the second portion of the second differential trace towards the first differential trace, wherein the third portion has the at least one second width that is greater than the first width of a paired third portion of the first differential trace that is not parallel with the third portion of the second differential trace; and

forming a fourth portion of the second differential trace that is substantially parallel with a paired fourth portion of the first differential trace, that has the first width, and that is contiguous with the third portion.

16. The method of claim 15 , wherein the at least one second width of the second portion of the second differential trace increases as the second portion transitions away from the first differential trace and the first portion of the second differential trace, wherein the at least one second width of the third portion of the second differential trace decreases as the second portion transitions away from the second portion of the second differential trace towards the first differential trace and the fourth portion of the second differential trace.

17. The method of claim 15 , wherein the first differential trace and the second portion of the second differential trace form an increasing spacing therebetween as the second portion of the second differential trace transitions away from the first differential trace and the first portion of the second differential trace and the first differential trace and the third portion of the second differential trace form a decreasing spacing therebetween as the third portion of the second differential trace transitions away from the second portion of the second differential trace toward the first differential trace and the fourth portion of the second differential trace.

18. The method of claim 15 , wherein the second portion of the second differential trace and the third portion of the second differential trace have substantially the same length.

19. The method of claim 15 , wherein the second portion of the second differential trace has the first width at a first end that is contiguous with the first portion and the at least one second width that is greater than the first width at a second end that is contiguous with the third portion, wherein the third portion of the second differential trace has the at least one second width at a first end that is contiguous with the second portion of the second differential trace and the first width at a second end of the third portion that is contiguous with the fourth portion, and a ratio of the at least one second width to the first width is up to a range from 1.1 to 2.

20. The method of claim 15 , wherein the second differential trace is configured to reduce impedance mismatches between the first differential trace and the second differential trace, and a crosstalk between the second differential trace and one or more adjacent traces.

Assignments (5)

RELEASE OF SECURITY INTEREST IN PATENTS PREVIOUSLY RECORDED AT REEL/FRAME (053546/0001) Recorded Jun 23, 2022

From: THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., AS NOTES COLLATERAL AGENT

To: DELL MARKETING L.P. (ON BEHALF OF ITSELF AND AS SUCCESSOR-IN-INTEREST TO CREDANT TECHNOLOGIES, INC.); DELL INTERNATIONAL L.L.C.; DELL PRODUCTS L.P.; DELL USA L.P.; EMC CORPORATION; DELL MARKETING CORPORATION (SUCCESSOR-IN-INTEREST TO FORCE10 NETWORKS, INC. AND WYSE TECHNOLOGY L.L.C.); EMC IP HOLDING COMPANY LLC

Reel/Frame 071642/0001 →

SECURITY AGREEMENT Recorded Oct 1, 2021

From: DELL PRODUCTS, L.P.; EMC IP HOLDING COMPANY LLC

To: CREDIT SUISSE AG, CAYMAN ISLANDS BRANCH

Reel/Frame 057682/0830 →

SECURITY AGREEMENT Recorded Apr 22, 2020

From: CREDANT TECHNOLOGIES INC.; DELL INTERNATIONAL L.L.C.; DELL MARKETING L.P.; DELL PRODUCTS L.P.; DELL USA L.P.; EMC CORPORATION; FORCE10 NETWORKS, INC.; WYSE TECHNOLOGY L.L.C.; EMC IP HOLDING COMPANY LLC

To: THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.

Reel/Frame 053546/0001 →

SECURITY AGREEMENT Recorded Mar 21, 2019

From: CREDANT TECHNOLOGIES, INC.; DELL INTERNATIONAL L.L.C.; DELL MARKETING L.P.; DELL PRODUCTS L.P.; DELL USA L.P.; EMC CORPORATION; FORCE10 NETWORKS, INC.; WYSE TECHNOLOGY L.L.C.; EMC IP HOLDING COMPANY LLC

To: THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.

Reel/Frame 049452/0223 →

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 1, 2019

From: CHANDRA, UMESH; LIAO, CHUN-LIN; MUTNURY, BHYRAV M.

To: DELL PRODUCTS L.P.

Reel/Frame 048217/0780 →