For an example of the sort of messages I'm talking about, look for the
messages titled: Re: Anyone interested in PCB Design Techniques
and: Re: Anyone interested in PCB Design Techniques for SI & EMC
There are several examples, enough to make my head spin, and more than
enough for me to try sending this message to the individuals involved.
Sorry to take up the list's time with this message, but I felt it needed
to be said.
ObContent: Has anyone noticed how different board vendors use different
calculations to get the same controlled impedance on the same board?
Some vendors will claim that it's impossible to meet impedance
requirements that other vendors can easily handle. Perhaps they are not
using the same materials, even though we specify FR4 and copper weight.
If you respond to this Content, please change the subject to something
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