Ok ok ok go to my home page and look for links to hs table of contents and hs section 1 through 4
http://www.alchemyresearch.com/ Steve Meier On Thu, 2008-10-30 at 16:29 -0400, Dave McGuire wrote: > I don't see any URLs in there.. > > -Dave > > On Oct 29, 2008, at 6:08 PM, Steve Meier wrote: > > I went looking to see if the Analog Device book was available > > electronically. Here are the links. > > > > > > Steve Meier > > > > > > High Speed System Applications Table of Contents > > > > > > > > High Speed System Applications Section 1: High Speed Data Conversion > > Overview > > > > > > > > High Speed System Applications Section 2: Optimizing Data Converter > > Interfaces > > > > > > > > High Speed System Applications Section 3: DAC, DDS, PLL's, and Clock > > Distribution > > > > > > > > > > High Speed System Applications Section 4: PC Board Layout and Design > > Tools > > > > > > > > On Tue, 2008-10-28 at 13:44 -0700, Steve Meier wrote: > >> I won't argue this point. I will refer every one to an Analog Device > >> publication "High Speed System Applications" copyright 2006 ISBN-10: > >> 1-56619-909-3 or ISBN-13: 978-1-56619-909-4 > >> > >> In particular if you get a copy of this book (and they gave me mine) > >> look at pages 4.15 and 4.16 > >> > >> There AD recommends connecting both of the A/D grounds "digital" and > >> "analog" to the analog ground plane "this is because it causes less > >> problems for the relatively small amount of digital return current > >> to be > >> returned through the analog ground than it would to connect the > >> converter to the much noisy digital ground. > >> > >> There is a lot more talked about then just that one blurb. > >> > >> Steve Meier > >> > >> > >> > >> On Tue, 2008-10-28 at 11:22 -0700, Joerg wrote: > >>> Stefan Salewski wrote: > >>>> Sometimes it is necessary/recommended to partition (separate) > >>>> power or > >>>> ground planes, i.e. for ADC or DC/DC-Converters, see page 16 and > >>>> 17 in > >>>> > >>>> http://focus.ti.com/lit/ug/slwu028c/slwu028c.pdf > >>>> > >>>> We can do this in pcb program with (adjoining) polygons. > >>>> Disadvantage is, that if we change the size of one of the > >>>> polygons we > >>>> have to manually adjust the other sizes. A other method may be > >>>> so divide > >>>> a large polygon by copper clearing traces (with trace width zero). > >>>> > >>>> This is related to my question from > >>>> > >>>> http://archives.seul.org/geda/user/Sep-2008/msg00387.html > >>>> > >>>> but not identical. > >>>> > >>>> What is the best way to handle this? > >>>> > >>> > >>> I can't speak to that but just one word of caution: In my 20+ > >>> years in > >>> engineering I have yet to see one case where splitting a ground > >>> plane > >>> under high-speed ADCs has worked. Regardless of what application > >>> notes > >>> say. Usually it didn't work, lots of noise. Or it kind of worked but > >>> fell apart the instant somebody whipped out a GSM cell phone or > >>> BlackBerry. > >>> > >>> Myself, I never spilt a ground place. OTOH the industry practice of > >>> splitting planes is providing part of my income :-) > >>> > >>> The only time I split is where required for safety, for example > >>> patient > >>> isolation per 60601 (ECG, ultrasound etc.). > >>> > >> > >> > >> > >> _______________________________________________ > >> geda-user mailing list > >> geda-user@moria.seul.org > >> http://www.seul.org/cgi-bin/mailman/listinfo/geda-user > > > > > > > > _______________________________________________ > > geda-user mailing list > > geda-user@moria.seul.org > > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user > > _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user