[gta02-core] Board parameters update
alvieboy at alvie.com
Fri Aug 28 18:39:36 CEST 2009
Werner Almesberger wrote:
> ?lvaro Lopes wrote:
>> Not good for RF lines - vias introduce a lot of reflection.
> So you'd keep RF on the surface ? And RF signals crossing a can
> boundary get a hole in the can ? I now see that this seems to be
> what has been done with GPS.
Yes, that's exactly it. Same reason to avoid 90 degree direction changes in RF lines - reflection.
>> BOTTOM: components + routing
>> L7: ground (less strict)
>> L6: routing + ground
>> L5: ground (strict) ??
>> L4: (power routing ?)
>> L3: ground (strict) ??
>> L2: power
>> TOP: components, routing
> So you'd start with 8 layers and then see if two of them end up
> bring avoidable ?
No, I think we should start with a 6 layer. Unless someone disagrees. I was just stating what I think is current FR PCB layer structure.
>> Current design has many. Not sure we can avoid buried vias at all.
> The fewer layers we have, the less difference there is between a
> buried and a blind via ;-))
True, true :)
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