Cross talk
Rev. 2.11


An estimated crosstalk coefficient between two traces can be calculated here.
One model holds for traces above the ground plane (microstrip), and the other is valid for traces between two ground planes (stripline).
tr is the rise time of the jamming signal.

General set-up for all models:
Relative permeability (er): , Rise time tr: [ns]


Micro Strip


Length of the section where the traces run parallel: L=[cm]
D=[mm]
h=[mm]

-> Cross talk coefficient = [dB]




If the driver and the load are adapted to the trace impedance the cross talk can be further reduced.
If the tolerance of the trace impedance is: [%], and the tolerance of the driver/load impedance is: [%] , then the Cross talk coefficient = [dB]


Strip Line


Length of the section where the traces run parallel: L=[cm]
D=[mm]
H=[mm]
h1=[mm], h2=[mm]

-> Cross talk coefficient = [dB]



If the driver and the load are adapted to the trace impedance the cross talk can be further reduced.
If the tolerance of the trace impedance is: [%], and the tolerance of the driver/load impedance is: [%] , then the Cross talk coefficient = [dB]


References:
- High-Speed Digital Design, Howard Johnson/Martin Graham ISBN 0-13-395724-1
- Information from http://www.UltraCAD.com

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Last updated: 2008-06-17
©
Sören Nilsson