Patent ID: 6670816
Filing Date: 2003-12-30
Classification: G01R,H05K

Abstract:
A test coupon configured to measure a dielectric constant of a memory module substrate, comprising:a first test pattern layer having an exposed surface; a second pattern layer formed internally; a long trace formed on each of said test pattern layers; a short trace formed on each of said test pattern layers; a first pair of probe pads arranged on the first test pattern layer, wherein one of the probe pads of the first pair of probe pads is connected to the long trace on the first test pattern layer and wherein the other one of the probe pads of the first pair of probe pads is connected to the short trace on the first test pattern layer; a ground pad arranged on the first test pattern layer, said ground pad configured to be connected to a ground of power supply; a second pair of probe pads on the first test pattern layer respectively connected to the long and short traces formed in the second test pattern layer; and a via contact electrically interconnected to the second pair of probe pads and to the long and short traces on the second test pattern layer.