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:
May. 16, 1995
Filed:
Jan. 03, 1994
Applicant:
Inventor:
Scott C Blackstone, Needham, MA (US);
Assignee:
Unitrode Corporation, Billerica, MA (US);
Primary Examiner:
Int. Cl.
CPC ...
H02L / ;
U.S. Cl.
CPC ...
257499 ; 257335 ; 257502 ; 257506 ; 257344 ;
Abstract
A semiconductor device is disclosed having improved vertical gain symmetry, and which includes thick, lightly-doped regions which are dielectrically isolated and provided by at least two separately processed semiconductor wafers which are bonded together and further processed to provide the finished device. Alternate embodiments include buried layers exhibiting very low resistance. Further alternate embodiments provide high voltage and/or high current devices which are fabricated together with low-power circuitry as an integrated circuit.