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Universal Probe Ring Board Assembly for Laser Trimmer

IP.com Disclosure Number: IPCOM000099738D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 3 page(s) / 118K

Publishing Venue

IBM

Related People

Mello, AA: AUTHOR

Abstract

Disclosed is an universal probe ring board assembly which is a direct replacement for board assemblies used with the Electro Scientific Industries (ESI) Models 24 and 44 Laser Trimmer machines. The universal probe ring board assembly eliminates the bulk of the variation in the probe board wiring between the development and the manufacturing laser trimmers. With fixed hard wiring on the board, measurement scanner wiring and trim programming can be standardized.

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Universal Probe Ring Board Assembly for Laser Trimmer

       Disclosed is an universal probe ring board assembly which
is a direct replacement for board assemblies used with the Electro
Scientific Industries (ESI) Models 24 and 44 Laser Trimmer machines.
The universal probe ring board assembly eliminates the bulk of the
variation in the probe board wiring between the development and the
manufacturing laser trimmers.  With fixed hard wiring on the board,
measurement scanner wiring and trim programming can be standardized.

      A typical embodiment of the universal probe ring board assembly
is shown in the figure.  The general locations of the board reference
hole (1), the alignment slots (2) around the reference hole for the
LEXAN* probe holder block (not shown), the circle of 36 pin cable
socket locations (3), the 50 pin scanner connectors (4), and the
various probe board alignment holes (5) are similar to the standard
ESI board assembly (ESI CKT ASSY No. 22888).

      The first important feature is that the circle of 36 pin cable
socket locations (3) is hard wired through printed circuit wiring on
the probe ring board (6) itself to the scanner connectors (4).  The
second feature is that the number of the socket locations (3) has
been increased above the original limit of 36.  The maximum limit is
now a function of the socket size and the available area for the
sockets.

      Another feature is the replacement of the four solder contact
connectors (4) for the scanners with printed circuit board compatible
50 pin connectors.  This action eliminates the rectangular openings
in the old style board and permits both sides of the probe board to
have printed circuit wiring.  Additional signal and reference planes
or multilayers can be used to increase signal wiring density and
control the electrical impedance of the board.  Thus, the new board
will have higher frequency operating capabilities and fewer coupled
noise problems.

      Other key features are the mounting of all sockets (3) on the
bottom side of the probe ring board and an increased board reference
hole (1) size.

      With all the plug sockets on the bottom side of the LEXAN probe
block clearly exposed, both these plug sockets and the increased
number of plug sockets around the alignment slots (2) can be easily
jumped together.  A Y type jumper cable (7) or equivalent can now be
used to connect a single LEXAN block socket to the board sockets for
a standard Kelvin wiring arrangement.  The single lead (7A) could be
connected...