Ground loops in analog and wireless design

Ground loops are parasitic paths in a PCB or an IC that can cause a number of bad effects. These are caused primarily by bad layout, either accidently or because of lack of experience. In order to avoid ground loops one has to understand: (1) What they are, (2) how they are caused,and (3)how to eliminate them or minimize their effects. A good review paper on this subject was recently released for publication by the techteam at Signal Processing Group Inc., and is available for review at their "engineering pages" in the website located at http://www.signalpro.biz.