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High Density/Low Noise Connector

IP.com Disclosure Number: IPCOM000102895D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 44K

Publishing Venue

IBM

Related People

Johnson, RA: AUTHOR [+2]

Abstract

This connector concept incorporates, to a very large degree, the elements of shielding, use of ground planes, the coaxial-type contact designs in a high density pitch, all of which allow effective low coupled noise properties. In addition, impedance matching of cable/connector and a signal-to-ground contact ratio of 1:1 insure the latter low noise behavior.

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High Density/Low Noise Connector

      This connector concept incorporates, to a very large degree,
the elements of shielding, use of ground planes, the coaxial-type
contact designs in a high density pitch, all of which allow effective
low coupled noise properties.  In addition, impedance matching of
cable/connector and a signal-to-ground contact ratio of 1:1 insure
the latter low noise behavior.

      The use of ground planes is enhanced by a built-in ground plane
in the board which can effectively mate with the connector ground
plane through multiple contact fingers which wipe in many locations.
The contact fingers also eliminate, for the most part, the ground pin
plugging as a significant part of the over- all plugging force during
simultaneous ganged contact engagement.  Also, the ground plane
eliminates from the footprint connector area a total of one row and
one column of ground locations and thus also contributes to the
reduction of overall plugging force.

      The signal contacts in this design therefore see either
complete coaxial environments or double ground plane environments to
produce very effective shielding and low coupled noise properties.

      The low noise attribute is further enhanced by standard
tri-plate transmission line design which extends the signal- ground
contacts from the connector-board interface into the internal board
structure as a transmission line pair.

      Disclosed anonymously.