Patent ID: 7176095

Claim:
A method of fabricating halo regions for a first group of transistors on a substrate substantially aligned with a first axis and a second group of transistors on the substrate substantially aligned with a second axis that is substantially perpendicular to the first axis, comprising: forming halo regions for the first group of transistors by implanting the substrate with impurities in a first direction substantially perpendicular to the first axis, and implanting the substrate with impurities in a second direction substantially opposite the first direction and substantially perpendicular to the first axis, and without implanting impurities in a direction substantially parallel to the first axis; and forming halo regions for the second group of transistors by implanting the substrate with impurities in a third direction substantially perpendicular to the second axis, and implanting the substrate with impurities in a fourth direction substantially opposite the third direction and substantially perpendicular to the second axis, and without implanting impurities in a direction substantially parallel to the second axis.