Patent ID: 8174011

Claim:
A positional offset measurement pattern unit incorporated in an insulating layer, comprising: a first interconnection formed in said insulating layer; at least one first via-plug formed in said insulating layer so as to be electrically connected to said first interconnection, such that first side faces of the first interconnection and the first via-plug are coplanar and a second side face of said first interconnection extends past a second side face of the first via-plug by a first distance along a first direction; a second interconnection formed in said insulating layer at substantially the same level as the first interconnection so as to be spaced apart from said first interconnection by a predetermined distance; and at least one second via-plug formed in said insulating layer so as to be electrically connected to said second interconnection, such that first side faces of the second interconnection and the second via-plug are coplanar and a second side face of said second interconnection extends past a second side face of the second via-plug by the first distance along the first direction, wherein a voltage is applied between said first and second interconnections to measure a relative positional offset amount between said first via-plug and said second interconnection, and wherein said second side face of said second interconnection is spaced apart from said coplanar first side faces of said first interconnection and the first via-plug by said predetermined distance that is less than the first distance.