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:
Nov. 29, 2005
Filed:
Jul. 23, 2003
Applicants:
Vladislav Vashchenko, Palo Alto, CA (US);
Ann Concannon, Palo Alto, CA (US);
Peter J Hopper, San Jose, CA (US);
Marcel Ter Beek, Pleasanton, CA (US);
Inventors:
Vladislav Vashchenko, Palo Alto, CA (US);
Ann Concannon, Palo Alto, CA (US);
Peter J Hopper, San Jose, CA (US);
Marcel ter Beek, Pleasanton, CA (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H009/00 ;
U.S. Cl.
CPC ...
Abstract
In an SCR-based ESD protection clamp, the voltage overshoot during an ESD event is reduced by separately controlling the voltage pulse to the drain and emitter contacts of the SCR. The voltage pulse to the drain is preferably delayed using a delay circuit such as an RC circuit. This allows double conductivity modulation to be achieved with lower voltage overshoot.