Dear all, I'm designing a board with a dual port Gigabit Ethernet Phy (Marvell 88E1020). This device needs 3.3V and 2.5V power supply for analog core (and others for digital core). Marvell suggests using 3.3V digital power supply and filtering noise (caused by other digital parts on board) by ferrite and caps to generate 3.3V for analog. They also say that, without proper damping, you could have resonance problems. I can also generate 'analog' 3.3V (and 'analog' 2.5V) from 5V by a linear regulator. What is best: - digital 3.3 + ferrite - 3.3V from 5V by LDO - 3.3V from 5V by LDO + ferrite ? We also need other analog power supplies (for example PLLs...) on board. Can we generate a single global analog 3.3V (from 5V by LDO) and use it for PLLs, GbEthernet Phy and others ? Thanks in advance and regards, Silvano Bettinzana ------------------------------------------------------------------ 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