[SI-LIST] Re: [SI-LIST]

Justin, not quite.  I think you need to pay attention to Istvan's 
comments in particular.  If you make the capacitor / mount / transition 
look resistive over the signal spectral content and matched to the 
channel, you can put it just about anywhere without impact.  To the 
extent that it presents a discontinuity, what is close by can matter 
significantly.  This is over and above whether locating in a particular 
arrangement can eliminates or introduces discontinuities like vias.

Steve

Smith, Justin D. wrote:
> Thanks to everyone who answered. To summarize what I've learned: 
>
> I understand the idea of linear building blocks and that each element can be 
> rearranged and the end result is the same - so in effect the location of the 
> ac coupling (dc block) capacitor makes little difference IF ALL THINGS REMAIN 
> THE SAME.
>
> As has been pointed out, often ALL THINGS DO NOT REMAIN THE SAME when the 
> capacitor is moved around. Different locations allow for different numbers of 
> vias which has a great effect on overall SI.
>
> We routinely minimize numbers of vias and try to backdrill vias at connectors 
> and other vias where possible on these speed traces.
>
> I have not been subscribed on this forum/freelist long, but I've been a 
> casual reader when the topic has been of interest. I appreciate everyone's 
> feedback.
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