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:
Apr. 12, 1994
Filed:
Mar. 02, 1992
Motorola, Inc., Schaumburg, IL (US);
Abstract
A transistor (10) is formed by utilizing an isolated well (18) within a thin epitaxial layer (14). A base mask (22) that has a base opening (23) is applied to expose a portion of the isolated well (18). A low resistance collector enhancement (24) is formed within the well (18) by doping a portion of the well (18) through the base opening (23). A base region (26) is formed overlying the collector enhancement (24) by doping the well (18) through the base opening (23). Forming the collector enhancement (24) through the base opening (23), facilitates providing the collector enhancement (24) with a small area thereby minimizing the transistor's (10) parasitic collector capacitance value, collector resistance, and transit time.