Tests Performed in Power and Ground Checks

Several power and ground checks analysis tests can be run. For each test performed, results might be reported to the result categories available for that test. In the result category descriptions in this document, the test name is indicated in parentheses after the category name.

  • Drill — Reports distance violations between NPTHs, PTHs, or Vias to plane, copper, clearances and annular rings.

  • Sliver — Reports slivers in negative and positive layers. See “Sliver and Short Sliver Categories (Power and Ground)”.

  • Thermal — Reports spoke (tie) widths and reduction of connectivity of thermal pads.

    These categories apply only to negative layers and to proper thermal pads (pads with “th...” names). The categories detect thermal ties either completely broken or chipped by adjacent clearances and thermals.

    The categories report the spoke (tie) width and the percentage of overall reduction in thermal pad electrical connectivity. If a thermal has four 10-mil ties, of which two are completely broken, there is a 50% reduction in thermal connectivity.

  • Plane Spacing — Reports spacing between features of different planes.

Parent Topic: Fabrication Analysis - Power and Ground Checks