Patent ID: 6424022
Filing Date: 2002-07-23
Classification: H01L

Abstract:
In at least a portion of an integrated circuit having a substrate, a plurality of spaced apart noise generating circuit blocks and a plurality of spaced apart noise sensitive circuit blocks defined in said substrate, a noise isolation structure comprising:a plurality of laterally extending diffusion guard bands of a first conductivity type defined in said substrate, said plurality of first conductivity type diffusion guard bands spaced apart from said noise generating and noise sensitive circuit blocks, and configured to extend around said noise generating and noise sensitive circuit blocks; a plurality of laterally extending diffusion guard bands of an opposite conductivity type defined in said substrate, said plurality of opposite conductivity type diffusion guard bands spaced apart from said noise generating and noise sensitive circuit blocks, and configured to extend around said noise generating and noise sensitive circuit blocks so that a perimeter of each of said noise generating and noise sensitive circuit blocks is bounded by a diffusion guard band of said first conductivity type and a diffusion guard band of said opposite conductivity type; a plurality of insulating layers overlying said first conductivity type and opposite conductivity type guard bands, said layers defining therethrough respective pluralities of spaced apart contact vias; a first metal conductor mesh configured to substantially overlie said plurality of laterally extending first conductivity type diffusion guard bands and respective ones of said vias to form solid electrical contact between said first metal conductor mesh and said plurality of laterally extending first conductivity type diffusion guard bands; and a second metal conductor mesh configured to substantially overlie said plurality of laterally extending opposite conductivity type diffusion guard bands and respective ones of said vias to form solid electrical contact between said second metal conductor mesh and said plurality of laterally extending opposite conductivity type diffusion guard bands.