[PCB_FORUM] Re: diff pair by area

Hi Kumaran,

We routinely run our differential pairs through 1mm pitch BGAs maintaining
our trace width/gap...no necking required.  I haven?t done any less than 1mm
pitch BGAs.  I am curious, what is your stack-up/differential impedance/BGA
spacing?

Regards,

Austin


> Hi Gerry,
>
> So no other possibilites other than reducing the line width to 3.99 ?
>
> Regards,
> Kumaran.
> ----- Original Message -----
> From: "Gerry Meier" <gerry.meier@xxxxxxxxxxxxxx>
> To: <icu-pcb-forum@xxxxxxxxxxxxx>
> Sent: Monday, February 28, 2005 9:10 PM
> Subject: [PCB_FORUM] Re: diff pair by area
>
>
> > "From previous posting on this forum"
> >
> > Define the primary diff line width as 4 mil  with a gap of 7 mil.
> >
> > Now Define the Neck line width as 4 mil with a gap of 4 mil.
> > ( I want the smallest line on the board to be 4 mil for fabrication
> > reasons.)
> >
> > Routing by hand, hit the neck menu option. Nothing happens. No smaller
> > gap.
> >
> > Ahhh, but if I change the Neck line width to 3.99 mil and gap to 4 mil.
> >
> > Route the line, Pick the neck menu, the new spacing and line width is
> > applied.
> >
> > This seems to be reproducible.  Changing the neck line width back to
> > 4mil breaks the feature.
> >
> >
> >
> > Gerry Meier
> > Sr. PCB Designer
> > Freedom CAD Services, Inc.
> > Voice: (603) 864-1300 x1350
> > Alt. Voice: (386) 753-0048
> > Email: gerry.meier@xxxxxxxxxxxxxx
> > visit our website at<http://www.freedomcad.com
> >
> >
> > -----Original Message-----
> > From: giyora kimhi [mailto:elcad@xxxxxxxxxxxx]
> > Sent: Monday, February 28, 2005 10:01 AM
> > To: icu-pcb-forum@xxxxxxxxxxxxx; icu-pcb-forum@xxxxxxxxxxxxx
> > Subject: [PCB_FORUM] diff pair by area
> >
> > hi all,
> >
> > im using allegro performance 15.2.
> > i have many diff pairs in my design and the rules for them work great
> > ,but between bga pins i need to decrees the "primary gap".
> > in 14.2 this was no problem ,is it possible to apply different diff pair
> > rule by area ?
> >
> > regards
> >
> >
> >
> > Giyora Kimhi
> > Elcad PCB  Ltd
> >
> > elcad@xxxxxxxxxxxx
> > Tel (Main):+972-3-967-6247 ;    2nd
> > Line:+972-3-958-0485   ;  Fax:+972-3-966-0948   ;    CP:+972-52-560-866
> > http://www.el-cad.co.il/
> >
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