Actually that is the HDI method that is becoming more and more popular.
Via-in-pad, internal routing and external GND planes.
Ken

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: Thursday, July 30, 2009 9:58 AM
To: [log in to unmask]
Subject: Re: [TN] Hashing-Out Hatching

Ha...  We had a designer at one time who thought that surface traces were
bad, very bad.  So every pad for every part had a short trace that
immediately went to a via and the signal was routed to an inner layer.
Seriously.  That guy needs your doctor...

regards,
 - Graham Collins

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of James Head
Sent: Thursday, July 30, 2009 10:50 AM
To: [log in to unmask]
Subject: Re: [TN] Hashing-Out Hatching

> Gary brought me back to the days when, just for kicks, I would take other 
> guy's designs and remove all of their vias, just to prove I could do it.
I've 
> gotten help, I'm cured, a thousand vias is nothing anymore.

You should pass me the details of your doctor - I always spend a little time
at the end of a project going through and trying to eliminate vias if I can
as I see everyone of them as a potential failure point - and it's very
satisfying to re-run the drill report and see the hole count drop!

Mind you I'm not obsessive though.  I worked with one relatively
inexperienced PCB designer once who spent a whole week designing a power and
deflection PCB for a televison and managed to do it all without any vias or
wire jumpers.  Unfortunately his design would never have worked with
segregation between the primary and secondary sides of the transformer and
0.3 mm traces carrying high voltages and currents!

James
********************************************************

The information transmitted is intended only for the person or entity to
which it is addressed and may contain confidential and/or privileged
material. If you are not the addressee, any disclosure, reproduction,
copying, distribution, or other dissemination or use of this transmission in
error please notify the sender immediately and then delete this e-mail.
E-mail transmission cannot be guaranteed to be secure or error free as
information could be intercepted, corrupted lost, destroyed, arrive late or
incomplete, or contain viruses.
The sender therefore does not accept liability for any errors or omissions
in the contents of this message which arise as a result of e-mail
transmission. If verification is required please request a hard copy
version.

********************************************************

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------