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:
Jun. 16, 2009
Filed:
Dec. 05, 2006
Phillip F. Chapman, Colchester, VT (US);
David S. Collins, Williston, VT (US);
Steven H. Voldman, South Burlington, VT (US);
Phillip F. Chapman, Colchester, VT (US);
David S. Collins, Williston, VT (US);
Steven H. Voldman, South Burlington, VT (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A design methodology is disclosed for optimizing guard ring design by optimizing the guard ring to power supply path resistance value between physical and/or virtual injection sources in a CMOS circuit and the corresponding power supply. By comparing the calculated guard ring to power supply path resistance value to resistance criteria derived from specifications, elements that need further redesign are identified. Repeated redesign with several redesign options eventually lead to an optimized guard ring structure that provides area-efficient and sufficient latchup protection for the CMOS circuit.