Joao, Some of the material produced for www.semi.org that I viewed is very compelling. You can start with "Silicon Magic" See - http://dom.semi.org/webcatalog.nsf/itemList?OpenForm&group=1300 Regards, Rich Rosenblum Principal Electrical Engineer Ametek PMT rich.rosenblum@ametek.com "joaomachado@earthlink.net"