Hi Vinod,
Based on the info you gave, i'd guess it's a DDR3 1066Mbps memory bus. If so,
it's mismatched at both ends - controller and DIMM. Hence, a NEXT noise would
reflect from the driver and show up at the load, attenuated some. How much
noise for 1W spacing "sometimes"? This must be simulated as Giancarlo
suggested earlier.
Regards,
Vadim Heyfitch
Sent from my phone
On May 10, 2016, at 3:04, "gianguida@xxxxxxxx" <gianguida@xxxxxxxx> wrote:
Hi Vinod,
this is a perfect case where using a em simulation + circuit simulation would
give you all the answers
you need
Giancarlo
----Messaggio originale----
Da: ah.vinod@xxxxxxxxx
Data: 10-mag-2016 9.20
A: "SI-LIST"<si-list@xxxxxxxxxxxxx>
Ogg: [SI-LIST] [SI-LIST]: Trace-2-Trace Coupling Length with Intentional
Crosstalk
Hi All,
Had a query on Trace-2-Trace coupling length in case of intentional
coupling/crosstalk due to physical limitations of board.
I am having 2 stripline traces routed from Point A to Point B in multiple
layers. Ideally i would love to keep them far apart so that there is no
coupling. But due to board constraints, i don't have space to keep them
apart.
The two traces are routed with spacing of 2W where there is space and with
1W spacing in many places where W is width of the trace (in my case H & W
are same numbers in stack-up)...
So would like to know what is the allowed coupling length when the
trace-2-trace spacing comes down to 1W. Signals rise time is 250ps with
frequency being 533MHz. Data pattern can be PRBS 7 or 101010.....
Regards
Vinod A H
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