Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1990-10-29
1992-05-05
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324158D, 324537, 340653, G01R 3100
Patent
active
051111373
ABSTRACT:
A method and apparatus for analyzing a semiconductor device having a diode formed therein. In its broadest sense, the invention involves irradiating the semiconductor device with electromagnetic radiation while monitoring the leakage current output from the diode contained in the semiconductor device. If the semiconductor device is present and properly soldered to the printed circuit board, an increase in the leakage current will be observed during the irradiation process. The increase in leakage current is also representative of the presence of intact bond wires at both the pin under test and the ground pin. The invention in a preferred form is shown to include a voltage source, electrically connected to the diode, for biasing the diode in a reverse direction, a current monitor, connected to monitor the leakage current from the diode and an electromagnetic radiation generator, positioned to provide electromagnetic radiation incident on the semiconductor device. It is preferred that the electromagnetic radiation be an ionizing radiation such as X-rays. However, such electromagnetic radiation can also be visible light, such as fluorescent light or incandescent light. In an especially preferred embodiment, the semiconductor device is first exposed to electromagnetic radiation, and thereafter the diode is biased in a reverse direction.
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Harwood Vance R.
Heumann John M.
Burns William J.
Hewlett--Packard Company
Wieder Kenneth A.
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