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:
Feb. 20, 1990
Filed:
Aug. 03, 1989
Applicant:
Inventor:
Jenny M Ford, Mesa, AZ (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ;
U.S. Cl.
CPC ...
437 56 ; 437 31 ; 437 33 ; 437 58 ; 437 38 ; 437203 ;
Abstract
An improved bipolar transistor of a BiCMOS integrated circuit is fabricated by utilizing a shallow trench structure. The shallow trench defines an active base and a self-aligned emitter. The base resistance of the transistor is reduced because a vertical, rather than lateral, link base, which connects an extrinsic base to the active base, is formed. In addition, the overall area is reduced, which provides for a lower collector to base capacitance.