Flat cable crosstalk - QuickField simulation example
We take a 28 AVG 0.050" pitch flat ribbon cable as a test model. Two wires carry a high frequency signal. The potentials of adjacent wires are measured.
How to find crosstalk in flat cables?
Engineering answer Typical applications Geometry
Given
Task
Solution
Results
To reduce the crosstalk the victim line can be screened off by the grounded wire. The idea of this example is taken from the How to minimize crosstalk in cable designs blog post by Collin Wells from Texas Instruments.
Engineering question
Set up a plane-parallel QuickField AC Conduction problem for a flat cable system and evaluate crosstalk from computed field results.
flat ribbon cables, parallel conductor cables, signal ribbon harnesses
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Simulation problem
Problem Type
Plane-parallel problem of AC conduction.
Relative permittivity of insulation ε = 2;
Frequency f = 1 MHz.
Calculate the induced voltage in the victim line.
We apply potential difference of ~2V at the signal line. The induced voltage in the victim line is measured in two cases: the intermediate strand is grounded, and the intermediate strand is insulated (floating conductor).
Induced voltage in the victim line is 71 mV. The grounded wire helps to reduce the induced voltage down to 16 mV.
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