Noise suppression technologies/case study introduction (Automotive)

An Introduction to Noise Suppression in Onboard Ethernet 100Base-T1 (2)

3. Radiation Noise Evaluation

Test Condition

The noise suppression effect of the common mode choke coil was confirmed with radiation noise measurements.

Radiation Noise Evaluation Test Condition_image

Measurement results

Radiation Noise Evaluation Measurement results_image1
Radiation Noise Evaluation Measurement results_image2
Radiation Noise Evaluation Measurement results_image3

4. Conductive Noise Evaluation

Test Condition

Conductive Noise Evaluation Test Condition_image1
Conductive Noise Evaluation Test Condition_image2

Test Board Circuit

Conductive Noise Evaluation Test Board Circuit_image

Measurement results

Conductive Noise Evaluation Measurement results_image

Noise increases across some frequencies with the CAN and FlexRay compliant DLW43SH101XK2, and the noise suppression effect is insufficient. However, the noise can be effectively suppressed by using the 100Base-T1 compliantDLW43MH201XK2

5. DPI Evaluation

The immunity improvement effect of the common mode choke coil was confirmed by performing a DPI (Direct Power Injection) test.

Test Condition

DPI Evaluation Test Condition_image1
DPI Evaluation Test Condition_image2

Measurement results

DPI Evaluation Measurement results_image

6. Summary

  • Because onboard Ethernet uses non-shielded cables which easily radiate noise and onboard noise standards must be supported, noise suppression is required.
  • CISPR25 Class5 radiation noise standards can be met by using the 100Base-T1 compliant DLW43MH201XK2.
    It displays a higher level of noise suppression for conductive noise and DPI than the common mode choke coils for CAN and FlexRay.

Click here for DLW43MH201XK2 details

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