[SI-LIST] Re: Vias or tracks?
- From: steve weir <weirsp@xxxxxxxxxx>
- To: Ibarrett@xxxxxxxxxxxxxx, SI-List <si-list@xxxxxxxxxxxxx>
- Date: Thu, 18 Mar 2004 06:11:51 -0800
Ian, of course the answer is alternative #3, short track with one via
straight down by rerouting the conflicting signal track on the inner
layer. A poor attachment to a decoupling capacitor can really undermine
the capacitor's effectiveness, making necessary even more capacitors and
more vias. If your layout is already tight, that can make for a difficult
situation.
Basically, add up the inductances. In simplistic terms, the variable
inductance will be the sum of the track lengths. But, tracks closer to the
ground plane will exhibit less effects than tracks on layers further out.
Regards,
Steve.
At 01:35 PM 3/18/2004 +0000, Ian Barrett wrote:
>Which is better, a meandering track on a single layer to reach the ground
>plane, or 2 vias and a short link track on another layer?
>
>I realise the answer is probably "it depends", but are there general
>guidelines to take into account?
>
>Thanks.
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