Browse Prior Art Database

Interaction Testing In A Thyristor Crosspoint Matrix

IP.com Disclosure Number: IPCOM000052194D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Benichou, C: AUTHOR [+3]

Abstract

In a crosspoint matrix array such as shown in the figure, some physical defects and particularly a possible interaction between two adjacent thyristors of the matrix cannot be detected by a test sequence addressing one crosspoint at a time.

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Interaction Testing In A Thyristor Crosspoint Matrix

In a crosspoint matrix array such as shown in the figure, some physical defects and particularly a possible interaction between two adjacent thyristors of the matrix cannot be detected by a test sequence addressing one crosspoint at a time.

For example, the crosspoint cell (i, j), when triggered, can also trigger crosspoint cell (i,j-1) or (i, j+1) adjacent to the anode line Ai, if there is a short- circuit defect between point P of cell (i,j) and the corresponding point P in cell (i, j-1) or cell (i, j+1) and crosspoint cell (i-1, j) or (i+l, j) adjacent to the cathode line Kj, if there is a short-circuit defect between point N of cell (i, j) and the corresponding point N of cell (i-1, j) or (i+l, j).

Such triggerings, when they occur, maintain adjacent crosspoints "ON" as long as cell (i,j) stays "ON". The current is shared by the devices as long as the Ai Kj path is maintained. If additional paths are marked using lines adjacent to Ai or Kj, then unwanted crosstalk takes place.

Typically, these defective configurations may be established between adjacent cells either by: - a rupture in the isolation diffusion barriers (both points N and P correspond to epitaxial pockets) - a metal short.

To eliminate these defective matrixes, the following test sequence is proposed: 1. The crosspoint cell (i, j) is triggered. To do this, a voltage supply is provided for each anode line A, and a current sink is provided for K...