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. 02, 2009
Filed:
May. 05, 2004
Applicant:
Firas N. Abughazaleh, Austin, TX (US);
Inventor:
Firas N. Abughazaleh, Austin, TX (US);
Assignee:
XILINX, Inc., San Jose, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H01L 29/72 (2006.01);
U.S. Cl.
CPC ...
Abstract
An integrated circuit includes a substrate, a noise sensitive circuit, and a first low impedance guard ring. The substrate includes a well-doped blocking ring that at least partially surrounds the noise sensitive circuit. The noise sensitive circuit is fabricated on the substrate. The first low impedance guard ring is fabricated on the substrate to at least partially surround the well-doped blocking ring, wherein the first low impedance guard ring is operably coupled to a first circuit ground, wherein impedance of the first low impedance guard ring is substantially less than impedance of the well-doped blocking ring.