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. 11, 1989
Filed:
Mar. 02, 1988
Applicant:
Inventor:
Claude Renous, Grenoble, FR;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 91 ; 361 56 ; 361111 ; 361119 ; 357 13 ; 379412 ;
Abstract
The circuit relates to the protection of some integrated circuits connected with transmission lines and therefore liable to be subject to overvoltages. The protection comprises diodes (D1, D2, D3). Those diodes switch towards an internal supply conductor (CA) either the external supply voltage VBAT, or the overvoltage possibly present on an output terminal (A) if said overvoltage is higher than the internal supply voltage. The diodes have a special structure, that is they are formed from junctions between regions electrically insulated from the epitaxial substrate on which the integrated circuit is formed. The invention applies in particular to subscriber line interface circuits.