Patent ID: 7365550

Claim:
A test fixture for coupling with a test instrument to measure impedance of a device, comprising: an upper layer having (a) a first and a second solder pad for physical and electrical connection to the device, (b) a first, second, third and fourth multi-solder pad for electrical connection to four connectors, (c) a first conductor track for connecting the first solder pad to a signal solder pad of the first multi-solder pad, (d) a second conductor track for connecting the first solder pad to a signal solder pad of the second multi-solder pad, (e) a third conductor track for connecting the second solder pad to a signal solder pad of the third multi-solder pad, and (f) a fourth conductor track for connecting the second solder pad to a signal solder pad of the fourth multi-solder pad, each multi-solder pad having at least one return path solder pad; a lower layer having conductor tracks connected to the return path solder pad of each multi-solder pad; and a dielectric substrate of uniform thickness separating the upper layer from the lower layer.