Patent ID: 9329495
Filing Date: 2016-05-03
CPC Classification: G03F

Claim Text:
1. A system comprising: a first metrology pattern for a first circuit structure field, the first metrology pattern comprising at least two first pairs of sub-patterns, at least one sub-pattern of the at least two first pairs of sub-patterns lacking 90 degree rotational symmetry, and a first center position for the first metrology pattern being determinable in an X-Y coordinate layout, wherein one first pair of sub-patterns of the at least two first pairs of sub-patterns independently determines an X coordinate of the first center position and another first pair of sub-patterns of the at least two first pairs of sub-patterns independently determines a Y coordinate of the first center position; and a second metrology pattern for a second circuit structure field, the second metrology pattern comprising at least two second pairs of sub-patterns, at least one sub-pattern of the at least two second pairs of sub-patterns lacking 90 degree rotational symmetry, and a second center position for the second metrology pattern being determinable in the X-Y coordinate layout, wherein one second pair of sub-patterns of the at least two second pairs of sub-patterns independently determines an X coordinate of the second center position and another second pair of sub-patterns of the at least two second pairs of sub-patterns independently determines a Y coordinate of the second center position.