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:
Jul. 12, 1988
Filed:
Nov. 28, 1986
Applicant:
Inventor:
John R Bender, Mesa, AZ (US);
Assignee:
Motorola Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ;
U.S. Cl.
CPC ...
437-6 ; 357 38 ; 437152 ;
Abstract
A GTO switch is provided in which the upper base layer (gate) is formed by a diffusion step. An epitaxial layer grown over the upper base layer contains cathode and gate diffusions which are separated by an undiffused gap. This 'buried base' technique provides precise control over the resistivity of the base. The cathode-gate gap provides increased reverse gate voltage capacity. Other features include a large anode short area and a double-layer-metal; contact structure on the cathode-gate surface.