Noise propagation for induced fast transient impulses on PCB-level

In this article an extended methodology to determine the dominant propagation paths of induced transient noise injected into a printed circuit board will be presented. Many noise sources and load conditions can now be considered. The physical signal paths carrying significant noise power from each source to a sensitive digital device port are determined by the use of efficient graph searching algorithms. The time domain waveform of these paths, including device drivers and receivers, is obtained by a hybrid analysis in HSpice environment. The methodology is applied to an interconnect system driven by two inverter gates. Some results are presented.