Patent ID: 6835578
Filing Date: 2004-12-28
Classification: H01L

Abstract:
A method of measuring the stress migration of vias, comprising the steps of:forming a metal line having a middle and opposing first and second ends; forming first and second opposing pads electrically connected to the respective opposing first and second ends of the metal line through respective first and second step-width line structures; forming a third pad connected to the metal line proximate its first end by a first via through a first metal structure; forming a fourth pad connected to the metal line proximate its second end by a second via through a second metal structure; the first and second vias being equidistant from the respective first and second ends of the metal line; and measuring the stress migration of the first via by measuring the sheet resistance between the first pad and the third pad; and/or measuring the stress migration of the second via by measuring the sheet resistance between the fourth pad and the second pad.