Method and structure to control common mode impedance in...

Wave transmission lines and networks – Coupling networks – With impedance matching

Reexamination Certificate

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C333S004000, C333S012000

Reexamination Certificate

active

07088200

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.

REFERENCES:
patent: 6677831 (2004-01-01), Cheng et al.

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