[SI-LIST] Re: Losses - 2.5Gbps on FR4

Hi Dorin

You can do the calculation in a split second!  Go to AWR at

http://mwoffice.com

Download the free application TXLINE (they will want to know who you are).

Put in the line parameters and press analyze.  You did not say whether it
was microstrip or stripline.  For microstrip line 5mil wide, I assumed h=10
mil, 18 micron copper(1/2 oz) I got 13.75 dB loss for 2.5 GHz, which is
rather worse than your simulation.  At 1 GHz I got 6.4 dB loss.  These
figures are greater for stripline.

Cheers
Geoff

> -----Original Message-----
> From: Dorin [mailto:dorin.oprea@xxxxxxxxxxx]
> Sent: 29 July 2003 15:47
> To: si-list
> Subject: [SI-LIST] Losses - 2.5Gbps on FR4
> 
> 
> Hi,
> The simulation I did shows 5dB voltage loss on 30" long 
> interconnect on
> FR4 (tan loss 0.03) which includes 0.005" traces 0.5 oz. copper, one
> NexLev and two Metral connectors. Two pulses P/N, 2V with 50 
> ohm series
> were applied to the circuit and one 100 ohm resistor as a termination.
> Is this loss real? If not, can you tell what is the approximate
> deviation, just to get a feeling?
> I was told that hspice simulated losses are too optimistic and
> therefore, long traces should be chopped; if so, what would be the
> optimum segment length recommended for the loss simulation so that the
> simulation time is not excessively long (now I need over 10 hours on
> Linux LSF server).
> 
> Thanks,
> Dorin
> 
> 
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> 
> 
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