[PCB_FORUM] Re: How-to? [Impedance]
- From: Dave Schaefer <dave.schaefer@xxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Thu, 27 Jul 2006 13:05:52 -0500
Work with your fabricator to determine appropriate stackup for the features /
impedances you require. Do not use tool auto-generated values ... they are
fabulous in theory, unachievable in reality in many cases such as yours.
Dave
>
> From: "William Billereau" <William.Billereau@xxxxxxx>
> Date: 2006/07/27 Thu PM 12:19:12 CDT
> To: <icu-pcb-forum@xxxxxxxxxxxxx>
> Subject: [PCB_FORUM] How-to? [Impedance]
>
> Hello All.
>
> We are actually fighting with impedances!
> all:all:50 ohm:5%
>
> Allegro routes with an autocalculated line width of 5.68mils.
> This is not possible to route inside the BGA which has an area with minimum
> line width set to 5 mils.
> small lenght routed with 5mils have impedance DRCs.
>
> I try to route them without the area using neck mode. The neck mode off the
> line is still 5mils. It does not switch again to 5.68mils...
> but it is not even a solution because the neck has also DRCs.. grrrrr.
>
> How do you generally proceed in such cases?
>
> Thanks in advance!
>
> William.
>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> | Billereau William | PCB Designer |
> | | Tel: (+4122) 76 73403 |
> | CERN TS/DEM | william.billereau@xxxxxxx |
> | 1211 Geneve 23 Switzerland | Société: AMEC-SPIE/Electrotech |
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>
>
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