Bipolar sinker structure and process for forming same
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United States of America Patent
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Mar 19, 1991
Grant Date -
N/A
app pub date -
Dec 28, 1988
filing date -
Dec 28, 1988
priority date (Note) -
Expired
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Abstract
A sinker which is self-aligned with the oxide isolating trench which is used to define the tub in which the complete bipolar device is located. In a preferred approach to the process for forming the sinker of this invention, little additional diffusion of the sinker occurs during subsequent processing, whereby an effective sinker, aligned with the collector of the bipolar device, is achieved without additional masking steps.
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