Browse Prior Art Database

Engineering Changes for TCM Boards Without Twisted Pair

IP.com Disclosure Number: IPCOM000103297D
Original Publication Date: 1990-Sep-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 38K

Publishing Venue

IBM

Related People

Havas, D: AUTHOR

Abstract

Engineering changes and repair wiring techniques are required to maintain critical characteristics for printed circuit boards which use tri-plate structures or strip-line structures to control impedance and signal propagation characteristics. This requirement may be satisfied by orthogonal wire segments which are imbedded between reference planes in a printed circuit board. The wire segments are brought to the surface in a regular pattern using small diameter blind vias. Programmability is provided by connecting the appropriate vias by short jumper wires. The critical characteristics are maintained by using short jumpers which cannot be far removed from the internal reference planes.

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Engineering Changes for TCM Boards Without Twisted Pair

      Engineering changes and repair wiring techniques are required
to maintain critical characteristics for printed circuit boards which
use tri-plate structures or strip-line structures to control
impedance and signal propagation characteristics.  This requirement
may be satisfied by orthogonal wire segments which are imbedded
between reference planes in a printed circuit board.  The wire
segments are brought to the surface in a regular pattern using small
diameter blind vias.  Programmability is provided by connecting the
appropriate vias by short jumper wires.  The critical characteristics
are maintained by using short jumpers which cannot be far removed
from the internal reference planes.

      In the figure, the buried wire segments (1) are brought to the
surface at vias (2), and connected into continuous orthogonal lines
by plated surface links (3).  Programming is accomplished by cutting
the necessary surface links (4). Then a jumper (5) is used to connect
to buried segments, and to connect to the fixed wiring or components
at signal lands (6).

      Disclosed anonymously.