The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 10, 1993
Filed:
Jul. 15, 1991
Robert K Cook, Poughkeepsie, NY (US);
Bob H Yun, Hopewell Junction, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A circuit for generating a negative voltage includes: a bipolar transistor including, a) an N type collector region, b) a P type base region, and c) an N type emitter region, the base region width between the emitter region and the collector region being less than about 5,000 angstroms and the dopant concentration of the base region being in the range of about 1-10.times.10.sup.18 atoms/cm.sup.3 ; means for applying a reference potential to the base region; and means for applying a bias potential to the emitter region so as to generate a negative output potential at the collector region. The circuit can likewise comprise a PNP bipolar transistor biased to generate a negative voltage. The circuit can be used on integrated circuit chips to provide a complementary voltage, thereby obviating the requirement for separate, complementary power supplies.