Noise Reduction Techniques

Noise Reduction Techniques in Electronic Systems book except has some interesting reading on ground loops and inductive noise reduction. This is old but still very valid material from Henry Ott, the EMC, noise, and signal integrity guru.

Read also Ground- A Path For Current Flow article which says: Consider ground as a low impedance path for current to return to the source, instead of as an equipotential, emphasizes the importance of current flows thought a finite, but hopefully small impedance any two ground points that are physically separated will be at different potentials.