Impact of low-impedance substrate on power supply integrity

Although it is tempting to think of the power grid as an independent medium of the transfer of energy from the package to the devices in the IC, some second-order technology-related effects can sometimes cause unforeseen problems. This article focuses especially on the relationship of the power delivery system to the silicon substrate properties, and shows how a low-impendance substrate can make a substantial difference in the noise generated by the power grid.