Detecting presence of N+ diffusion faults in a micropackage cont

Details Detecting presence of N+ diffusion faults in a micropackage cont Detecting presence of N+ diffusion faults in a micropackage cont

1990-12-19

1992-07-21

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

371 221, 371 251, G01R 3128

Patent

active

051326159

ABSTRACT:
In order to determine if a micropackage containing a plurality of integrated circuits, at least some of which are supplied with a reference voltage, should be classified as "risky" the reference voltage current is measured for each micropackage in a group of logically identical micropackages. The measurements are arranged for statistical analysis, and an initial threshold is selected above which a micropackage is classified as "risky". The subsequent history in operation of measured micropackages, as well as reference voltage measurements on additional newly fabricated like micropackages, is entered into the database to permit refining the position of the threshold. In one variant, all micropackages in an initially measured group are "passed".

REFERENCES:
patent: 4631724 (1986-12-01), Shimizu
patent: 4637020 (1987-01-01), Schinabeck
patent: 4710704 (1987-12-01), Ando
patent: 4820974 (1989-04-01), Katsura et al.

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