[SI-LIST] Re: Ground Pour in Signal Layers

Hi, Pradeep

My point of view, Ground pour on the signal layers (especially =
intra-layer) is not useful unless you intend to create a grounded shield =
signal channel for special signal routing, eg. high-speed signals then =
ground via-array is required to connect GND plane vertically. This will =
take lot of routing area. If you are looking for isolation, adding =
ground between signal traces won't help since the spacing is a =
dominator.
if you are routing high-speed signal traces on top/bottom layers, you =
may think using ground pour to create coplanar waveguide (CPW) for high =
signal quality.=20

Regards,

Yuming =20

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Pradeep RSA
Sent: Thursday, February 23, 2006 3:04 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Ground Pour in Signal Layers


Hi,
      does a Ground Pour in the Signal layers in a multilayer PCB (with=20
sufficient internal ground planes) really helps?
=20
Thanks in advance
Pradeep
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 =20



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