> All the theoretical reason for doing or not doing are fine and dandy, > and I respect Mr. Einarson very much, but the proof is in the pudding. > If people are tieing visa directly to the plance and have not had > problems, and indeed have increased the performance of their design, > then we MUST take another look at why we do things. I believe that > many of the things we do, and many of the rules of thumb we follow are > legacy items - there may have been a good reason at one time, but > technology has made the "reason" obsolete. This does not mean that I > do or do not advocate this particular item (I have asked the editors > of PC Fabrication and Circuits Assembly to comment on this via issue), > but that if there is something that seems to work, we should look at > it and ask questions. > I will be glad to put this particular issue on the schedule for one of > PCD's projects in early '97, ie. have several shops build a board with > via tied straignt to the gnd or pwr plane, run it over a wave etc. and > see what happens. As Lee Ritchey says "don't believe it just because > someone says so, ask for physicl proof.) > > Pete Waddell * DITTO! Very well put Pete. I can't encourage everyone enough, if you want the latest scoop on high-speed design related issues, please attend a Lee Richey or James Blankenhorn (SMT Plus) course. There should be one coming up at the PCB Design Conference, East Coast. Old design practices are out-dated when it comes to high-speed design (>100Mhz). Sincerely, Mitch Morey Sr. PCB Designer TRW, Inc. Redondo Beach, CA 90278 Phone: (310)814-5765 Fax: (310)812-4949 EMAIL: [log in to unmask] ||||| ((o o)) ____________________________oOO_(_)_OOo_____________________________ PCB layout is like fine art. You have to DIE to be famous! ____________________________________________________________________ (_) (_) **************************************************************************** * The mail list is provided as a service by IPC using SmartList v3.05 * **************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ****************************************************************************