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:
Dec. 31, 1991
Filed:
Mar. 16, 1990
Applicant:
Inventors:
Lowell E Clark, Phoenix, AZ (US);
Robert B Davies, Tempe, AZ (US);
Bernard W Boland, Scottsdale, AZ (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ;
U.S. Cl.
CPC ...
357 35 ; 357 34 ; 357 20 ; 357 88 ;
Abstract
Integrated high voltage transistors having minimum transistor to transistor crosstalk are fabricated in refilled epitaxial tubs, which are formed in a heavily doped substrate. The heavily doped substrate provides the isolation between each transistor, and thus provides for minimum transistor to transistor crosstalk. The voltage capability of the transistor is increased by forming the base surrounding the collector contact in the refilled epitaxial tub.