Guard ring having electrically isolated lightening bars

Details Guard ring having electrically isolated lightening bars Guard ring having electrically isolated lightening bars

2005-08-09

2005-08-09

Cuneo, Kamand (Department: 2841)

Electricity: conductors and insulators

Conduits, cables or conductors

Preformed panel circuit arrangement

C174S261000, C430S005000

Reexamination Certificate

active

06927345

ABSTRACT:
A guard ring for protecting against electrostatic discharge (ESD) that has electrically isolated lightning bars has a substrate, a first ring, and a second ring. The first ring is on the substrate and has a number of electrically connected lightning bars. The second ring is also on the substrate and concentric to the first ring, but has a number of lightning bars that are electrically isolated from one another. The first ring may be the outer ring and the second ring may be the inner ring, or vice-versa. The guard ring has an ESD breakdown voltage that does not change, even after the first ring or the second ring has protected against ESD. The guard ring may protect a semiconductor component like a semiconductor photomask or a semiconductor device.

REFERENCES:
patent: 5272371 (1993-12-01), Bishop et al.
patent: 5714784 (1998-02-01), Ker et al.
patent: 6060752 (2000-05-01), Williams
patent: 6153913 (2000-11-01), Hsu et al.
patent: 6291114 (2001-09-01), Reijers
patent: 6372390 (2002-04-01), Liu et al.
patent: 6509617 (2003-01-01), Hiraga

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