FreeLists / si-list / [SI-LIST] Re: remove non-functional pads: any improvement be seen

[<lin-wl_wang@xxxxxxxxxxx>]

Thanks to all who responded!

I checked with PCB fabricator again. They can easily delete all unused =
pads, but it would be time-consuming to selectively delete some of them.

Just curious, do you always choose to remove non-functional pads for GHz =
signal lines? And How much improvement have you seen?

Thanks!
-WL

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Chris McGrath
Sent: Friday, April 02, 2004 10:58 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: remove non-functional pads



Our board house uses Boardstation and it is my understanding that
turning unused pads off (removing them) is a configuration option.  I'm
not sure if you can selectively do it, but I know that this is not
difficult to do if you want all pads removed.

-Chris

> -----Original Message-----
> From: lin-wl_wang@xxxxxxxxxxx [mailto:lin-wl_wang@xxxxxxxxxxx]=3D20
> Sent: Thursday, April 01, 2004 8:48 PM
> To: si-list@xxxxxxxxxxxxx
> Cc: lin-wl_wang@xxxxxxxxxxx
> Subject: [SI-LIST] remove non-functional pads
>=3D20
>=3D20
> Hello,
>=3D20
> I would like to know how to remove those non-functional pads=3D20
> in order to reduce via capacitance? Manually or automatically=3D20
> by layout software?
>=3D20
> Currently I'm thinking of two methods.
> 1.In layout design, define via in the way that:
> (1) on all inner layers, pads defined as diameter=3D3D0 or 12,=3D20
> drilling hole=3D3D12mil(for example)
> (2) on an inner layer where trace is connected, pads defined=3D20
> as diameter=3D3D20mil, drilling hole=3D3D12mil
>=3D20
> To what I understand, the unnecessary pads will be removed,=3D20
> and the pads used to route out the traces will remain. But=3D20
> there're many errors when generating the gerber due to this=3D20
> removal. Don't feel comfortable with the errors. We're now=3D20
> using PADS PowerPCB, do not know if the software has a=3D20
> function to remove these pads automatically. Hasn't got reply=3D20
> from vendor yet.
>=3D20
> 2. or manually remove the pads in gerber file, but there're=3D20
> quite a lot.=3D20
> How do you think about the two method? Is there any better=3D20
> way to remove?
>=3D20
> Thanks!
> -Wang Lin
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