Hello SI Experts :: We have three PCb cards in our system.The first one is a FPGA board and the second board is a analog front end card and contains a)D to A converters b)A to D converters and the third board is a RF Transceiver board.The "D to A" coverter gives input to the RF board and the "A to D" converter gets its inputs from the RF card. The power supply to the second board is given from the first board.Now on the second board the power planes are split into two planes a) Analog supply plane and 2)Digital supply plane.Both the planes are joined at a single point through a RF beed. similarly the grounds are also split into two planes and joined at a single point. QUEST::The power supply comming from the FPGA card needs to be taken as Digital power or the Analog power for the second card.Can somebody pls try and reason it out. Best Regards -- suresh - ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org 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