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. 27, 1993
Filed:
Jun. 18, 1991
Kaoru Terashima, Kawasaki, JP;
Kazuo Ishikawa, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In a semiconductor integrated circuit, a digital circuit section and an analog circuit section are formed on a substrate. A pair of first power source lines connects a circuit element in the digital circuit section to a power source, while a pair of second power source lines connects a substrate region in the digital circuit section to the power source. The pair of second power source lines is formed separately from the pair of first power source lines in the digital circuit section. The substrate region in the digital circuit section is surrounded by a guard ring well, to which one of the pair of second power source lines is connected.