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:
Aug. 19, 2014
Filed:
Jun. 29, 2012
Applicants:
Pekka Kalervo Ojala, Fremont, CA (US);
Shi-ping Fan, Milpitas, CA (US);
Inventors:
Pekka Kalervo Ojala, Fremont, CA (US);
Shi-Ping Fan, Milpitas, CA (US);
Assignee:
Exar Corporation, Fremont, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H 3/22 (2006.01); H02H 9/04 (2006.01); H02H 3/20 (2006.01); H01L 27/02 (2006.01);
U.S. Cl.
CPC ...
H02H 3/20 (2013.01); H02H 9/046 (2013.01); H01L 27/0285 (2013.01);
Abstract
An Electrostatic Discharge (ESD) protection circuitry comprises a protection device structure. The protection device structure includes at least one transistor with a gate operably connected to a pad. The at least one transistor turns on upon an ESD event and conducting charge to a substrate. At least one additional transistor with a gate operably connected to the substrate turns on after the at least one transistor upon an ESD protection event.