Method and structure to control common mode impedance in fan-out regions
US7088200B2 · kind B2 · utility
8Cited by
1References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2004 |
| Grant date | Aug 8, 2006 |
| Priority date | — |
| Expiry date | Jan 1, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P5/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and structure are provided to control common mode impedance in fan-out regions for printed circuit board applications. A differential pair transmission line includes a narrow signal trace portion in the fan-out region and a wider signal trace portion outside of the fan-out region. A dielectric material separates the differential pair transmission line from a reference power plane. A thickness of the narrow signal trace is increased and a thickness of the dielectric material is correspondingly decreased in the fan-out region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.