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:
Oct. 06, 2009
Filed:
Nov. 27, 2007
Applicants:
Yeh-ning Jou, Taipei County, TW;
Geeng-lih Lin, Hsinchu County, TW;
Inventors:
Yeh-Ning Jou, Taipei County, TW;
Geeng-Lih Lin, Hsinchu County, TW;
Assignee:
Vanguard International Semiconductor Corporation, Hsinchu, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H 9/00 (2006.01); H02H 1/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An electrostatic discharge (ESD) protection circuit is provided. A transistor is coupled between a node and a ground, and has a gate coupled to the ground. A diode chain is coupled between the node and a pad, and comprises a plurality of first diodes connected in series, wherein the first diode is coupled in a forward conduction direction from the pad to the node. A second diode is coupled between the node and the pad, and the second diode is coupled in a forward conduction direction from the node to the pad.