Patent ID: 7442600

Claim:
A method of forming threshold voltage implant regions, comprising: providing a semiconductor substrate, the substrate having at least two channel region locations defined therein, one of the at least two channel region locations being a first channel region location and another of the at least two channel region locations being a second channel region location, the first and second channel region locations having first and second areas, respectively; using a mask to block a portion of the first area, and to block a portion of the second area; the percentage of the second area blocked with the mask being larger than the percentage of the first area blocked with the mask; the mask blocking only portions of the first and second areas to leave unblocked portions of the first and second channel region locations; while the mask blocks the portions of the first and second areas, conducting an implant of threshold voltage dopant into the unblocked portions of the first and second channel region locations to form threshold voltage implant regions within the first and second channel region locations; and diffusing the dopant throughout portions of the first and second channel region locations blocked by the mask during the implant so that concentrations of the threshold voltage dopant in the unblocked portions of the first and second channel region locations are substantially similar to concentrations of the threshold voltage dopant in the blocked portions of the first and second channel region locations.