Fishing – trapping – and vermin destroying
Patent
1987-01-23
1988-08-09
Hearn, Brian E.
Fishing, trapping, and vermin destroying
437 60, 437918, 357 34, H01L 21265
Patent
active
047628049
ABSTRACT:
A method is set forth of manufacturing a bipolar transistor with emitter ballast resistors. According to the invention, a base window and a strip-shaped opening are formed beside each other on a collector region. The strip-shaped opening is first covered by a masking layer and then doping of the base is provided. After removal of the masking layer, oxide layers of the same thickness are formed in the base window and in the strip-shaped opening. After formation of emitter fingers, base contact windows are formed within the base zone, and resistance windows are formed within the strip-shaped opening, whereupon simultaneously base contact zones and mutually separated emitter ballast resistors are formed in these windows.
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Ghandhi, S. K. "VLSI Fabrication Principals" 1983, pp. 354-357, 626-631.
Hearn Brian E.
McAndrews Kevin
Miller Paul R.
U.S. Philips Corporation
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