[SI-LIST] Re: PCB Parasitics
- From: sunil bharadwaz <sunil_bharadwaz@xxxxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Sun, 1 Jun 2008 11:09:38 -0700 (PDT)
Hi Steve ,
Thanks for the Reply!!
The traces are about 6 mil wide & about 15 mil spaced.I believe i can
conveniently consider them as loosely coupled (I have margin to increase
the spacing to 18 mils).
The models are not available from the vendor.That's the whole issue ..
The values of 8.3 nH/inch & 3.3 pf/ have been from the same book.
regards
Sunil
steve weir <weirsi@xxxxxxxxxx> wrote: Sunil, look at the circuit model. Set up
the model with a driver
working against the two line sections. Compare that model to the case
of a driver and a single line. For the loosely coupled case I hope the
resulting parasitic values will be obvious from inspection of the
circuit diagram. If not, I recommend Eric Bogatin's book, "Signal
Integrity Simplified".
Steve.
sunil bharadwaz wrote:
> Hi All ,
> For a Fr4 50 ohm line ,the PCB parasitics can be approximated as 8.3nH/inch
> & 3.3 pf/inch.We are doing a design with 100 ohm differential RF traces.
> What would be the best estimate for these parasitics.
>
> Thanks & Regards
> Sunil.Bh
>
>
>
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