[SI-LIST] Re: Advice
- From: "Zabinski, Patrick" <zabinski.patrick@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 20 Jul 2009 15:56:18 -0500
Agreed.
My extension to this is that the physical placement of the capacitor can
often add or remove discontinuties.
For example, of your backplane connnector is a through-hole part, it's
often possible to place the capacitor close enough to the connnector to
route a short microstrip over the the connector pin. By doing so,
you've eliminated one via, and you'd likely reduced the pin stub length.
The same thing often happens when the capacitor is placed next to the
chip.
From a basic electrical perspective, the placement of the capacitor
should not matter. However, if you can place the capacitor near some
other part and thus reduce some unwanted parasitics/discontinuities, it
often helps.
Good luck,
Pat Zabinski
> This is a linear system. The capacitor (and it's associated
> transition
> pads, vias and traces) have exactly the same characteristics
> no matter
> where it is placed. Your problem has absolutely nothing to
> do with the
> fact that this is a capacitor.
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