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LDC1101: Electrical shield for sensing coil already tried?

Olaf Albert
Intellectual 320 points

Hello experts,

Shortly I have experience electrical interferers in LDC applications. When I add a shielding plate grounded to earth the interferers (output of an PC power supply in stand-by!) disappeared. A shielding plate can only be used in the lab not at the customers site.

I know that magnetic loop antennas for shortwaves are sometimes electrically shielded (see drawing attached). Beacuse the shielding is interrupted it has only minor influence (eddy currents) on the antenna. Has been something similar tried out already with the inductance to digital converters? Or are there other suggestions for - especially electrical - interferers besides the ferrite sheet trials of Ben Kasemsadeh?

Thank you for the answer!

Best regards, Olaf

  • 0
    TI__Genius 14270 points
    Hello Olaf,

    You can indeed use capacitive shielding - we have looked at using a 4 layer PCB, where the inner 2 layers are used for the coil, and the outer two layers have capacitive shielding. This approach, while effective, can reduce the LDC sensitivity, especially with smaller sensors.

    Other approaches to consider include using larger sensor capacitors, which proportionally reduce impact of parasitic capacitances.

    Regards,

    ChrisO