The publication Planet Analog picked up one of my blog posts for publication to their readers. I invite you to go to their site for my full post.
The system ground return, or GND, symbol is often taken for granted when drawing schematics. GND symbols are placed all over the schematic with the assumption that the different GNDs will all be at the same electrical potential on the printed circuit board (PCB). In reality, current flow through the GND impedance can create voltage differences between the GND connections on the PCB. Single-ended dc circuits are particularly sensitive to these GND voltage differences because the expected single-ended circuit is converted to a differential circuit causing output errors. To read the rest of the post, go here.
