Browse Prior Art Database

Common reference for planar twisted pair structure

IP.com Disclosure Number: IPCOM000225792D
Publication Date: 2013-Mar-05
Document File: 3 page(s) / 67K

Publishing Venue

The IP.com Prior Art Database

Abstract

Described is a common reference for planar twisted pair structure.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 70% of the total text.

Page 01 of 3

Common reference for planar twisted pair structure

Within US patent 6,444,490, there is no mention of carrying any common-mode reference along with the differential pair. Because almost all signals in printed circuit boards are referenced to "GND" planes, there is an inherent electrical discontinuity when those signals enter packages, leadframes, or connectors. This disclosure teaches common-mode reference along with the differential pair.

    US patent 6,444,490 describes a pseudo-twisted pair structure which is formed by laminating planar conductors together, and connecting them vertically through the lamination. This structure is then connected to the package leadframe (see Figures 1 and 2 below).

Within this patent, there is no mention of carrying any common-mode reference along

1


Page 02 of 3

with the differential pair. Because almost all signals in printed circuit boards are reference to "GND" planes, there is an inherent electrical discontinuity when those signals enter packages, leadframes, or connectors. By using the method of another invention, one can place a ground return path onto this microflex connector, improving the electrical performance of the connector.

    In the previous disclosure, a bulk wirebond feed was used to create a common reference conductor for a tape-backed twisted wirebond (see Figure 3).

    By using the same technology, this invention uses adhesive and a laminating process to add a common reference conductor to the planar conductors formi...