[SI-LIST] Re: fiber-weave effect alive and well?
- From: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- To: "Aditya Chandra" <aditya@xxxxxxxxxxxxxxx>, m_p_sen@xxxxxxxxx, hreidmarkailen@xxxxxxxxx, "si-list" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 30 Aug 2007 09:01:27 -0700
Acid traps as a problem died out 20 years ago.
> [Original Message]
> From: Aditya Chandra <aditya@xxxxxxxxxxxxxxx>
> To: <m_p_sen@xxxxxxxxx>; <hreidmarkailen@xxxxxxxxx>; si-list
<si-list@xxxxxxxxxxxxx>
> Date: 8/29/2007 10:43:35 PM
> Subject: [SI-LIST] Re: fiber-weave effect alive and well?
>
> Hello
>
> One reason I can think of is when two traces are running in paralled then
> lets say as an example at the point of 90 degrees angle or 45 degrees
angle
> the distance between the tracks changes which has an effect on impedance.
>
> They can also become acid traps.
>
> regards
> aditya
> ----- Original Message -----
> From: "sengottuvel m.p." <m_p_sen@xxxxxxxxx>
> To: <hreidmarkailen@xxxxxxxxx>; "si-list" <si-list@xxxxxxxxxxxxx>
> Sent: Thursday, August 30, 2007 10:36 AM
> Subject: [SI-LIST] Re: fiber-weave effect alive and well?
>
>
> Hi all,
>
> Normally, we are advised to have horizontal, vertical and diagonal
traces
> in PCB not any angle. Even grater than 135 degree corners in traces are
> asked to avoid. Is this due to trace boundary line smoothness issue in
> manufacturing (say aperture control) or something else?
>
> Thanks,
> Sengo
>
>
>
> ----- Original Message ----
> From: agathon <hreidmarkailen@xxxxxxxxx>
> To: si-list <si-list@xxxxxxxxxxxxx>
> Sent: Thursday, August 30, 2007 5:30:25 AM
> Subject: [SI-LIST] fiber-weave effect alive and well?
>
>
> * I've reviewed DesignCon 05,07 material on fiber-weave effect.
> * A 10G (802.3ap) PHY vendor claims their demo setup used FR408 (Dk/Df =
> 3.77/0.012) for backplane sections and a total channel of 1meter.
> * FR408, as far as I know, still has the basic weave/resin construction,
> though perhaps less Dk delta.
>
>
> Q:
> 1. Huh? What happened? Did the PHY vendor call in the wizard kids from
> Hogworts? What is the current reality?
> 2. Any knowledge of Rogers4350? Ie: a different construction? Weave
> effect?
> 3. Up to date publications on this? (Besides references in the above DCon
> material.)
>
> Also, I see no mention of the weave effect on authoritative things from
> 802.3ap people on commsdesign or elsewhere, from 2004 on.
>
> ---
>
>
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