{"id":1027,"date":"2026-04-01T10:31:00","date_gmt":"2026-04-01T01:31:00","guid":{"rendered":"https:\/\/www.muratasoftware.com\/en_wacul_new\/fwp-new-wacul\/?post_type=case&p=1027"},"modified":"2026-09-04T16:22:47","modified_gmt":"2026-09-04T07:22:47","slug":"her017","status":"publish","type":"case","link":"https:\/\/www.muratasoftware.com\/en\/case\/her017\/","title":{"rendered":"Cross Talk Analysis Between Two Sets of Differential Lines with Vias"},"content":{"rendered":"\n
General<\/th>When the distance between the differential lines is varied,
The effect on crosstalk noise between two sets of differential signals was investigated.
It is a standard function of Femtet with the interval between the differential lines as variable name dx.
It is calculated by waving dx = 0.35, 1.0 by parametric analysis.<\/th><\/tr><\/thead>
Analysis Model<\/td>Two sets of differential line analysis models with differential vias are shown in Figure 1.
The differential line analysis model is based on electromagnetic wave analysis example 22.
Figure 2 shows an image of shaking the variable dx in parametric analysis.<\/td><\/tr>
Result<\/td>The far-end crosstalk frequency characteristics (Sd4d1) of the differential signal are shown in Figure 3.
The near-end crosstalk frequency characteristics (Sd3d1) of the differential signal are shown in Figure 4.
From the results in Figures 3 and 4, we can see how the smaller the differential track spacing, the larger the crosstalk.

Figure 5 shows the TDR waveform.
Because the shape of the differential track itself (Via diameter, track width, etc.) was not changed in this case,
There is no difference between the two.<\/td><\/tr>
Keywords<\/td>Crosstalk Noise, Differential Transmission Lines, Differential Vias, TDR Waveforms<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
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