FreeLists / si-list / [SI-LIST] Shielding clock traces on PCB's

["Coombs, William B. \(US SSA\)" <william.coombs@xxxxxxxxxxxxxx>]

=20
Hello all,

In regards to noise reduction, how effective do guard traces
seem to be?

Iv'e experimented with Hyperlynx by simulating my clock lines=20
on the spectrum analyzer. These clock lines were simulated with=20
and without grounded guard traces wrapped around the clock traces.=20
The results showed little to no noise reduction with the addition
of the guard traces.

The clock lines & guard traces were routed on an internal layer in=20
a dual-stripline Stackup.

Thanks.

William B. Coombs
BAE Systems
(973)636-7463
Email:William.Coombs@xxxxxxxxxxxxxx







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