Fishing – trapping – and vermin destroying
Patent
1993-03-05
1994-11-29
Thomas, Tom
Fishing, trapping, and vermin destroying
437 55, 437133, 148DIG72, H01L 21265
Patent
active
053690427
ABSTRACT:
This is a method of forming a bipolar transistor comprising: forming a subcollector layer, having a doping type and a doping level, on a substrate; forming a first layer, of the same doping type and a lower doping level than the subcollector layer, over the subcollector layer; increasing the doping level of first and second regions of the first layer; forming a second layer, of the same doping type and a lower doping level than the subcollector layer, over the first layer; increasing the doping level of a first region of the second layer which is over the first region of the first layer, whereby the subcollector layer, the first region of the first layer and the first region of the second layer are the collector of the transistor; forming a base layer over the second layer of an opposite doping type than the subcollector layer; and forming an emitter layer of the same doping type as the subcollector layer over the base layer. Other devices and methods are also disclosed.
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Morris Francis J.
Plumton Donald L.
Yang Jau-Yuann
Yuan Han-Tzong
Burton Dana L.
Kesterson James C.
Nguyen Tuan
Stoltz Richard A.
Texas Instruments Incorporated
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