[PCB_FORUM] Re: high speed board material.
- From: "Schwartz, Jerome" <jschwa01@xxxxxxxxxx>
- To: "'icu-pcb-forum@xxxxxxxxxxxxx'" <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Fri, 18 Feb 2005 11:43:48 -0500
Sam,
We have done up to 2Ghz on FR4. Your edge rate is also not too fast.
The only issue is the length of the trace. FR4 and does not hold it's impedance
well over long distances. Stripline will be much better than microstrip. Just
leave a minimum of 10% for single ended impedance and 15% for diff pairs.
Jerry
-----Original Message-----
From: sjcharles@xxxxxxx [mailto:sjcharles@xxxxxxx]
Sent: Friday, February 18, 2005 11:37 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: high speed board material.
speed 1 ghz, 8 ly, 1/2 oz, rate edge approx 9n, 5/5 width and spacing maybe 4
for necking. two or threes pair controlled Z. If Fr4 will do the job then i that
would be fine.
thanks
>
> From: "Schwartz, Jerome" <jschwa01@xxxxxxxxxx>
> Date: 2005/02/18 Fri AM 10:49:28 EST
> To: "'icu-pcb-forum@xxxxxxxxxxxxx'" <icu-pcb-forum@xxxxxxxxxxxxx>
> Subject: [PCB_FORUM] Re: high speed board material.
>
> Sam,
>
> There are many variables associated with picking a material:
>
> 1. Dielectric Constant.
> 2. Frequency.
> 3. Edge rate.
> 4. Layer count.
> 5. Stackup.
> 6. Copper weight.
> 7. Impedance. Microstrip or stripline high speed signals.
> 8. Line width.
> 9. Rework.
> 10. Thermal.
>
> Do you know some of these? If so, I can suggest materials.
>
> Regards,
> Jerry Schwartz, CID+
> IPC Advanced Certified Designer
> "May The Schwartz Be With You."
>
> Designer 3
> Harris Corporation GCSD Voice (321)-727-5474
> P.O. Box 37, MS 1/3232 Pager (321)-690-9797
> Melbourne, FL 32902-0037
> mailto:Jerome.Schwartz@xxxxxxxxxx
> http://www.harris.com
>
>
>
>
>
> -----Original Message-----
> From: sjcharles@xxxxxxx [mailto:sjcharles@xxxxxxx]
> Sent: Friday, February 18, 2005 10:42 AM
> To: icu-pcb-forum@xxxxxxxxxxxxx
> Subject: [PCB_FORUM] high speed board material.
>
>
> Group:
> We will be doing a PCI card which will have high speed digital signals. Which
> type of board material (fr4,rogers...) would be ideal?
>
> TIA
> Sam
>
>
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