Archive for December 2009

Ground loop common-mode compensation

Ground loops affect video signals. Understand them, then deal with them. When designing or installing the cables for a video transmission system, one assumption that engineers commonly make is that the local earth grounds of both ends of the cable are the same. When circumstances don’t support this assumption, the video performance can exhibit gross


This is quite funny logo for an IC. This VIA GRA HT8501 is a real chip used on PC motherboards. The question is the naming of the chip intentional or just happened by accident? Original image source: