Steve, I don't see these other attempts.
Eric Winsor Steve Meier wrote: > Dave, > > No I struggled three times to get usable url's so go down a couple more > of my attempts and then you will have to take the line breaks out of the > ultra long url but you can get there. > > 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 > _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user