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:
Sep. 12, 2006
Filed:
Aug. 27, 2004
Applicant:
Shiao-shien Chen, Hsin-Chu, TW;
Inventor:
Shiao-Shien Chen, Hsin-Chu, TW;
Assignee:
United Microelectronics Corp., Hsin-Chu, TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H 3/20 (2006.01); H02H 9/04 (2006.01); H02H 9/00 (2006.01); H02H 3/22 (2006.01);
U.S. Cl.
CPC ...
Abstract
An electrostatic discharge (ESD) protection circuit formed on a P-type substrate has a first pdiffusion region in the P-type substrate, a N-well in the P-type substrate, a first ndiffusion region in the N-well, a P-well in the N-well, and an n-p-n bipolar junction transistor (BJT) in the P-well. An equivalent circuit between a base and an emitter of the BJT is a diode without connecting to any resistor in parallel.