[SI-LIST] Crosstalk between different layers

Hi all,

I'm investigating this configuration in order to estimate the crosstalk
between  L2 and L3.

L1       -------------      Plane (GND)
L2               ---             signal
L3               ---             signal
L4       -------------      Plane (Power)

My target is to obtain a minimum spacing between the two layers that allow a 
maximum
crosstalk level (for example < 5%).
I'm wondering if I can use the H.Johnson book formula :

crosstalk < 1/[1+(D/H)^2].

If yes, assuming a ground-signal distance of 5 mils and a signal-signal 
distance of 20 mils,
which is the value I have to use for H?

And if one signal layer is 90 degree routed, there is any difference?

In H.Johnson book section 5.8.5 (ten-layer stack) there is a similar 
configuration:
the crosstalk between layers 4 and 6 is determined by the ratio of separation 
to ground plane
height. But I don't understood how the geometric average height of 0.007 inch 
is calculated.

Thanks in advance.

Roberto Carretta.



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