Hi, I first heard about buried capacitance (not to be confused with embedded capacitance) for power and ground, using thin dialiectrics, over 10 years ago, from the original papers that Hadco had published. I had thought that since the technology has been around for so long that most fab houses would be able to use it. I figured that my latest PCB, that is running signals at over 3 Gb/s, and has some limitations in terms of space for decoupling caps, would be a good candidate for a bured capacitance layer (two layers and a 2 mil dialectric core). When I sent the board out for quote I was surprised to learn that only Sandmina Circuits "owns" the technology and very few other vendors have licensed it. So, I would like to know from the SI community at large, if this technology is widely used. If so, could I get the name of some alternate vendors that have licensed it? Also, what is the general consenus of the viability of buried capacitance (not embedded capacitance). Thank You Tom tom_cip_11551@xxxxxxxxxxx ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net 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