Patent ID: 7808248
Filing Date: 2010-10-05
Classification: H01L

Abstract:
1. A radio frequency test key structure positioned in a scribe line region comprising: a substrate, at least a scribe line region being defined in the substrate; a device under test positioned in the scribe line region on the substrate, comprising at least two signal connecting terminals and at least two ground connecting terminals; and at least two metal layers positioned in the scribe line region, the metal layers comprising a bottom metal layer positioned on the substrate and a top metal layer positioned on the bottom metal layer, the top metal layer being a metal pad in a sheet form, at least two signal pad regions and at least two ground pad regions being defined in the top metal layer, the signal pad regions being electrically connected to the signal connecting terminals of the device under test through the top metal layer, the ground pad regions being electrically connected to the ground connecting terminals of the device under test, the signal pad regions and the ground pad regions being arranged in one row, the row being parallel to the scribe line region, the top metal layer comprising at least an insulating opening between the signal pad regions and the ground pad regions and between the two signal pad regions so as to separate the signal pad regions from the ground pad regions and to separate the signal pad regions from each other, and the insulating opening narrows parts of the top metal layer adjacent to the device under test gradually from an edge of the top metal layer to the device under test.