Biomedical Engineering Reference
In-Depth Information
Source
Sink
Actual defect sites
Incorrectly classified defect sites
Figure 4.12
An example of incorrectly classified defects.
Source
Source
Sink
Sink
Source
Sink
Actual defect sites
Incorrectly classified defect site
Figure 4.13
Elimination of incorrectly classified defects using a binary-search-based diagnosis.
4.2.2 untestable Sites
An untestable site is defined as an electrode that cannot be traversed by any
test droplets in the parallel scan-like test method. A site becomes untestable
when there are defects in both its row and column, and in all four direc-
tions, that is, north, south, east, and west, as shown in Figure 4.14. In this
case, test droplets are impeded by the defects, and they cannot reach the
untestable site.
The preceding problem can be addressed by carrying out one more itera-
tion of the parallel scan-like test. As in the column and row test, we referred
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