[SI-LIST] Re: AW: Effect of temperature on at 200C for DDR3/4 boards
- From: Hermann Ruckerbauer <hermann.ruckerbauer@xxxxxxxxxxxxx>
- To: barthi1@xxxxxxxxx
- Date: Wed, 16 Dec 2009 16:00:31 +0100
Hi,
I would agree with the previous answers ... don't worry on the PCB
performance to much, the degradation of the silicon is what you need to
take care.
On DRAM side it is not only the change in the OCD (output drivers), but
also the refresh timings are getting quite short for 100°C.
So you really need to do worst case corner simulations over the whole
temperature range.
I guess reliability is something you anyhow take a closer look for your
temperature range ..
regards
Hermann
EKH - EyeKnowHow
Hermann Ruckerbauer
www.EyeKnowHow.de
Hermann.Ruckerbauer@xxxxxxxxxxxxx
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Havermann, Gert schrieb:
> Hi Barthi,
>
> Your question is how the characteristic impedance of the PCB is affected by
> high temperatures (100°C)?
>
> The Temperature shouldn't have a big influence on impedance. The series
> resistance will increase, but the result will just be higher losses. The
> board sice will increase with temperature, but each differential pair will
> just see fractions of this extra size, in my eyes not enough to worry about
> impedance changes.
>
> I don't think you have to worry about temperature related impedance changes
> on regular PCB at all, but I can't proof that with simulations or
> measurements.
>
> BR
> Gert
>
>
>
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> Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
> Auftrag von Barthi das
> Gesendet: Mittwoch, 16. Dezember 2009 12:57
> An: si-list@xxxxxxxxxxxxx
> Betreff: [SI-LIST] Effect of temperature on at 200C for DDR3/4 boards
>
> Hi,
>
> What is the effect of temperature (200C) on characteristic impedance at
> DDR3/4 speeds and what the best way to control the impedance because of the
> temp effect? Appreciate if anyone sends the literature related to the topic
>
> Thanks
> Barthi
>
>
>
>
>
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