Patent ID: 7829951

Claim:
A method comprising: depositing, on a silicon substrate, a first dummy structure having a first sidewall and a second sidewall separated by a first width; depositing, on the silicon substrate, a second dummy structure concurrently with depositing the first dummy structure, the second dummy structure having a third sidewall and a fourth sidewall separated by a second width, wherein the second width is substantially greater than the first width; depositing a first insulating material to form a first insulating spacer adjacent to the first sidewall and to form a second insulating spacer adjacent to the second sidewall; depositing a second insulating material to form a third insulating spacer adjacent to the third sidewall and a fourth insulating spacer adjacent to the fourth sidewall; and removing a portion of at least one of the third insulating spacer and the fourth insulating spacer; wherein the first dummy structure is used to form a first pair of fins separated by approximately the first width; wherein the second dummy structure is used to form a second pair of fins separated by approximately the second width.