Hi, I read some books and papers saying that one should divide the PCB ground plane into analog, digital, I/O areas...(e.g. "PCB design techniques for EMC compliance" M. Montrose) and some other papers are saying that the best practice is juste using a unique ground plane but placing the components into block areas controling the return curent flow... (e.g. "Grounding and Shielding techniques" R.Morrison and, "Best practice in circuit board design" T. Jarvis) Is there a best practice ? Can I have some comments ? Thanks, Thomas. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu