[SI-LIST] Re: fiber-weave effect alive and well?
- From: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- To: "agathon" <hreidmarkailen@xxxxxxxxx>, "si-list" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 30 Aug 2007 09:00:08 -0700
This material called FR408 is a broad class of materials made with all of
the glass weave styles I show in my second book. The weave styles that are
responisble for the nasty jitter and varying velocity are 106 and 1080,
both of which have been sthe subject of studies that resulted in at least
one patent and the push to route traces at odd angles. When a uniform
weave, such as 3313 is used, this problem goes away. I wrote about it in
my April Circuitree columnm.
Unfotunately, Rogers 4350 uses 1080 glass reinforcement. Wish they used
3313!
Lee
> [Original Message]
> From: agathon <hreidmarkailen@xxxxxxxxx>
> To: si-list <si-list@xxxxxxxxxxxxx>
> Date: 8/29/2007 5:47:36 PM
> 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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