[SI-LIST] Re: Measuring Crosstalk
- From: "Crain, Dan S" <dan.s.crain@xxxxxxxxx>
- To: <aaron.helleman@xxxxxxxxxxx>
- Date: Thu, 17 Apr 2003 09:31:05 -0700
Hi Aaron,
I check crosstalk in the lab using the following approach:
- Review board layout to determine which line (or pair) has the most =
physically adjacent line parallelism.
- Write test code that simultaneously holds the identified victim line =
static while switching significantly contributing physiacally adjacent =
lines. Be sure to have code that forces both even and odd mode coupling =
cases. Try to also keep non-coupling contributor lines and other =
interfaces static so that you are not measuring SSO effects plus =
crosstalk.
- Run the code and measure the coupled energy on your victim line.
Rgds,
Dan
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Aaron Helleman wrote:
> What's the standard way to measure crosstalk in the lab? We have
> experimentally determined that there is crosstalk on our PCB due
> to traces being too close together for an xDSL system on the analog
> side. We want to characterize the amount of crosstalk between two
> 'bad' ports vs. two 'good' ports
> to determine if our respin will work properly in simulation.
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> The frequency band of interest is between DC and 1100 KHz, which seems
> like it should not be succeptable to crosstalk very much, but we have
> experimentally determined
> that if we re-route the tracks of interest using rework wire we can =
make
> the crosstalk go away.
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> Would a spectrum analyzer and a signal generator be the way to go, or
> perhaps a network analyzer to check the rejection ratio?
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> Could we do this via simulation as well?
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> --
> Aaron
>=20
>=20
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