Patent ID: 8663879

Claim:
A lithography mask set comprising: a gate mask including neighboring dummy feature pitch restrictions, comprising: a first active gate feature having a first line width W 1 over an active area and a neighboring feature having a second line width=0.8 W 1 to 1.3 W 1 , said neighboring dummy feature having a first side adjacent to said first active gate feature, and a nearest gate level feature on a second side opposite to said first side; wherein said neighboring dummy feature defines a gate pitch based on a distance to said first active gate feature or said neighboring dummy feature is positioned to maintain a gate pitch in a gate array including said first active gate feature; and wherein a spacing between said neighboring dummy feature and said nearest gate level feature provides one of: (i) maintaining said gate pitch and (ii) being at a sub-resolution assist feature (SRAF) enabling distance that is ≧2 times said gate pitch and said gate mask includes a SRAF over said SRAF enabling distance.